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v3.26.1

Investment Securities - Amortized Cost and Estimated Fair Values of Investment Held to Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2026 | Dec. 31, 2025 | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | --- | --- | ---
Held to Maturity |  |  |  |
Amortized Cost | $ 393,696 | $ 414,926 |  |
Gross Unrealized Gains | 142 | 290 |  |
Gross Unrealized Losses | 37,448 | 37,100 |  |
Estimated Fair Value | 356,390 | 378,116 |  |
Allowance for Credit Losses | 81 | 99 | $ 178 | $ 203
U.S. Treasury and government agency securities |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 92,514 | 104,836 |  |
Gross Unrealized Gains | 0 | 2 |  |
Gross Unrealized Losses | 4,503 | 4,513 |  |
Estimated Fair Value | 88,011 | 100,325 |  |
Allowance for Credit Losses | 0 | 0 |  |
Mortgage-backed securities |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 294,223 | 303,129 |  |
Gross Unrealized Gains | 123 | 255 |  |
Gross Unrealized Losses | 32,526 | 32,167 |  |
Estimated Fair Value | 261,820 | 271,217 |  |
Allowance for Credit Losses | 0 | 0 |  |
Other debt securities |  |  |  |
Held to Maturity |  |  |  |
Amortized Cost | 6,959 | 6,961 |  |
Gross Unrealized Gains | 19 | 33 |  |
Gross Unrealized Losses | 419 | 420 |  |
Estimated Fair Value | 6,559 | 6,574 |  |
Allowance for Credit Losses | $ 81 | $ 99 |  |

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