| 2026-07-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2026-07-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2026-04-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2026-04-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2026-02-06 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2026-02-06 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2025-10-22 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2025-10-22 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2025-07-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2025-07-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2025-04-24 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2025-04-24 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2025-02-07 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2025-02-07 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2024-10-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2024-10-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2024-07-19 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2024-07-19 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2024-04-25 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2024-04-25 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B · SYFPrB · NYSE |
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| 2024-02-08 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2023-10-24 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2023-07-21 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2023-04-20 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2023-02-09 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2022-10-25 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2022-07-21 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2022-04-21 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2022-02-10 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2021-10-21 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2021-07-22 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2021-04-27 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2021-02-11 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2020-10-22 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2020-07-23 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2020-04-22 | 10-Q | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2020-02-13 | 10-K | Stock registered under Section 12(b) | Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A · SYFPrA · NYSE |
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| 2015-02-23 | 10-K | Well-known seasoned issuer | No |
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