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Investment Securities - Amortized Cost and Estimated Fair Values of Investment Held to Maturity Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | $ 433,535 |  | $ 481,280 |  |  |
Gross Unrealized Gains | 127 |  | 19 |  |  |
Gross Unrealized Losses | 40,122 |  | 56,565 |  |  |
Estimated Fair Value | 393,540 |  | 424,734 |  |  |
Allowance for Credit Losses | 95 | $ 199 | 203 | $ 101 | $ 108 | $ 94
U.S. Treasury and government agency securities |  |  |  |  |  |
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | 114,884 |  | 132,560 |  |  |
Gross Unrealized Gains | 0 |  | 0 |  |  |
Gross Unrealized Losses | 5,200 |  | 8,555 |  |  |
Estimated Fair Value | 109,684 |  | 124,005 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Mortgage-backed securities |  |  |  |  |  |
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | 311,689 |  | 336,755 |  |  |
Gross Unrealized Gains | 101 |  | 0 |  |  |
Gross Unrealized Losses | 34,436 |  | 47,234 |  |  |
Estimated Fair Value | 277,354 |  | 289,521 |  |  |
Allowance for Credit Losses | 0 |  | 0 |  |  |
Other debt securities |  |  |  |  |  |
Held to maturity securities: |  |  |  |  |  |
Amortized Cost | 6,962 |  | 11,965 |  |  |
Gross Unrealized Gains | 26 |  | 19 |  |  |
Gross Unrealized Losses | 486 |  | 776 |  |  |
Estimated Fair Value | 6,502 |  | 11,208 |  |  |
Allowance for Credit Losses | $ 95 |  | $ 203 |  |  |

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