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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Available for sale securities: |  |  |
Amortized Cost | $ 159,593 | $ 120,832 |
Gross Unrealized Gains | 557 | 69 |
Gross Unrealized Losses | 10,938 | 10,380 |
Available for sale investment securities | 149,212 | 110,521 |
Held to maturity securities: |  |  |
Amortized Cost | 481,280 | 513,282 |
Gross Unrealized Gains | 19 | 57 |
Gross Unrealized Losses | 56,565 | 55,509 |
Estimated Fair Value | 424,734 | 457,830 |
Allowance for Credit Losses | 203 | 94 | $ 0
U.S. Treasury and government agency securities |  |  |
Available for sale securities: |  |  |
Amortized Cost | 22,984 | 23,472 |
Gross Unrealized Gains | 4 | 5 |
Gross Unrealized Losses | 2,786 | 3,002 |
Available for sale investment securities | 20,202 | 20,475 |
Held to maturity securities: |  |  |
Amortized Cost | 132,560 | 143,442 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 8,555 | 10,377 |
Estimated Fair Value | 124,005 | 133,065 |
Allowance for Credit Losses | 0 | 0 |
Mortgage-backed securities |  |  |
Available for sale securities: |  |  |
Amortized Cost | 130,439 | 91,280 |
Gross Unrealized Gains | 84 | 5 |
Gross Unrealized Losses | 8,139 | 7,258 |
Available for sale investment securities | 122,384 | 84,027 |
Held to maturity securities: |  |  |
Amortized Cost | 336,755 | 357,870 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 47,234 | 43,864 |
Estimated Fair Value | 289,521 | 314,006 |
Allowance for Credit Losses | 0 | 0 |
Obligations of states and political entities |  |  |
Held to maturity securities: |  |  |
Amortized Cost | 1,465 | 1,470 |
Gross Unrealized Gains | 19 | 57 |
Gross Unrealized Losses | 34 | 19 |
Estimated Fair Value | 1,450 | 1,508 |
Allowance for Credit Losses | 0 | 0 |
Other debt securities |  |  |
Available for sale securities: |  |  |
Amortized Cost | 6,170 | 6,080 |
Gross Unrealized Gains | 469 | 59 |
Gross Unrealized Losses | 13 | 120 |
Available for sale investment securities | 6,626 | 6,019 |
Held to maturity securities: |  |  |
Amortized Cost | 10,500 | 10,500 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | 742 | 1,249 |
Estimated Fair Value | 9,758 | 9,251 |
Allowance for Credit Losses | $ 203 | $ 94 |

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