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Investment Securities - Amortized Cost and Estimated Fair Values of Investment Held to Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Mar. 31, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | $ 459,445 |  | $ 481,280 |  |  |
Gross Unrealized Gains | 23 |  | 19 |  |  |
Gross Unrealized Losses | 44,769 |  | 56,565 |  |  |
Estimated Fair Value | 414,699 |  | 424,734 |  |  |
Allowance for Credit Losses | 199 | $ 178 | 203 | $ 108 | $ 116 | $ 94
U.S. Treasury and government agency securities |  |  |  |  |  |
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | 129,269 |  | 132,560 |  |  |
Gross Unrealized Gains | 3 |  | 0 |  |  |
Gross Unrealized Losses | 6,253 |  | 8,555 |  |  |
Estimated Fair Value | 123,019 |  | 124,005 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | 321,213 |  | 336,755 |  |  |
Gross Unrealized Gains | 5 |  | 0 |  |  |
Gross Unrealized Losses | 37,884 |  | 47,234 |  |  |
Estimated Fair Value | 283,334 |  | 289,521 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Other debt securities |  |  |  |  |  |
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | 8,963 |  | 11,965 |  |  |
Gross Unrealized Gains | 15 |  | 19 |  |  |
Gross Unrealized Losses | 632 |  | 776 |  |  |
Estimated Fair Value | 8,346 |  | 11,208 |  |  |
Allowance for Credit Losses | $ 199 |  | $ 203 |  |  |

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