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Investment Securities (Amortized Cost and Estimated Fair Values of Securities) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Pledged available-for-sale securities |  |
Amortized Cost | $ 120,832 | $ 95,999
Restricted securities | 17,900 | 11,169
Pledged held-to-maturity securities |  |
Amortized Cost | 513,282 | 559,455
Estimated Fair Value | 457,830 | 494,627
Total |  |
Pledged available-for-sale securities |  |
Amortized Cost | 62,290 | 83,288
Restricted securities | 54,489 | 72,108
Pledged held-to-maturity securities |  |
Amortized Cost | 185,876 | 19,158
Estimated Fair Value | $ 167,649 | $ 16,305

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