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Investment Securities (Amortized Cost and Estimated Fair Values of Investment Securities) (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
--- | --- | --- | --- | ---
Available-for-sale securities: |  |  |  |
Amortized Cost | $ 190,583 | $ 120,832 |  |
Gross Unrealized Gains | 350 | 69 |  |
Gross Unrealized Losses | 11,437 | 10,380 |  |
Investment securities - AFS | 179,496 | 110,521 |  |
Held-to-maturity securities: |  |  |  |
Amortized Cost | 503,938 | 513,282 |  |
Gross Unrealized Gains | 44 | 57 |  |
Gross Unrealized Losses | 59,724 | 55,509 |  |
Estimated Fair Value | 444,258 | 457,830 |  |
Allowance for Credit Losses | 116 | 94 | $ 163 | $ 0
U.S. Treasury and government agencies |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost | 72,701 | 23,472 |  |
Gross Unrealized Gains | 8 | 5 |  |
Gross Unrealized Losses | 3,168 | 3,002 |  |
Investment securities - AFS | 69,541 | 20,475 |  |
Held-to-maturity securities: |  |  |  |
Amortized Cost | 143,215 | 143,442 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 11,172 | 10,377 |  |
Estimated Fair Value | 132,043 | 133,065 |  |
Allowance for Credit Losses | 0 | 0 |  |
Mortgage-backed-residential |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost | 111,780 | 91,280 |  |
Gross Unrealized Gains | 20 | 5 |  |
Gross Unrealized Losses | 8,174 | 7,258 |  |
Investment securities - AFS | 103,626 | 84,027 |  |
Held-to-maturity securities: |  |  |  |
Amortized Cost | 348,754 | 357,870 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 47,343 | 43,864 |  |
Estimated Fair Value | 301,411 | 314,006 |  |
Allowance for Credit Losses | 0 | 0 |  |
Other debt securities |  |  |  |
Available-for-sale securities: |  |  |  |
Amortized Cost | 6,102 | 6,080 |  |
Gross Unrealized Gains | 322 | 59 |  |
Gross Unrealized Losses | 95 | 120 |  |
Investment securities - AFS | 6,329 | 6,019 |  |
Held-to-maturity securities: |  |  |  |
Amortized Cost | 10,500 | 10,500 |  |
Gross Unrealized Gains | 0 | 0 |  |
Gross Unrealized Losses | 1,185 | 1,249 |  |
Estimated Fair Value | 9,315 | 9,251 |  |
Allowance for Credit Losses | 116 | 94 |  |
States and political subdivisions |  |  |  |
Held-to-maturity securities: |  |  |  |
Amortized Cost | 1,469 | 1,470 |  |
Gross Unrealized Gains | 44 | 57 |  |
Gross Unrealized Losses | 24 | 19 |  |
Estimated Fair Value | 1,489 | 1,508 |  |
Allowance for Credit Losses | $ 0 | $ 0 |  |

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