Investment Securities - Summary of Pledged Securities (Details) - USD ($) $ in Thousands |
Mar. 31, 2026 |
Dec. 31, 2025 |
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|---|---|---|---|---|
| Debt Securities, Available-for-sale [Line Items] | ||||
| Held-to-maturity | [1] | $ 883,675 | $ 922,837 | |
| Asset Pledged as Collateral | Securing public and trust department deposits, and repurchase agreements: | ||||
| Debt Securities, Available-for-sale [Line Items] | ||||
| Available-for-sale | 306,147 | 328,516 | ||
| Held-to-maturity | 750,422 | 704,470 | ||
| Asset Pledged as Collateral | Securing additional borrowing capacity at the FHLB and the FRB: | ||||
| Debt Securities, Available-for-sale [Line Items] | ||||
| Available-for-sale | 129,691 | 4,018 | ||
| Held-to-maturity | $ 43,854 | $ 68,425 | ||
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