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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities: |  |
Fair value, less than 12 months | $ 24,479 | $ 32,180
Unrealized losses, less than 12 months | 150 | 2,541
Fair value, more than 12 months | 72,504 | 50,752
Unrealized losses, more than 12 months | 10,230 | 9,878
Fair Value | 96,983 | 82,932
Unrealized Losses | 10,380 | 12,419
U.S. Treasury and government agencies |  |
Available-for-sale securities: |  |
Fair value, less than 12 months | 74 | 1,165
Unrealized losses, less than 12 months | 0 | 4
Fair value, more than 12 months | 17,750 | 16,585
Unrealized losses, more than 12 months | 3,002 | 3,588
Fair Value | 17,824 | 17,750
Unrealized Losses | 3,002 | 3,592
Held-to-maturity securities: |  |
Fair value, less than 12 months |  | 67,332
Unrealized losses, less than 12 months |  | 2,786
Fair value, more than 12 months |  | 67,163
Unrealized losses, more than 12 months |  | 10,815
Fair Value |  | 134,495
Unrealized Losses |  | 13,601
Mortgage-backed securities |  |
Available-for-sale securities: |  |
Fair value, less than 12 months | 24,405 | 29,125
Unrealized losses, less than 12 months | 150 | 2,409
Fair value, more than 12 months | 52,864 | 34,167
Unrealized losses, more than 12 months | 7,108 | 6,290
Fair Value | 77,269 | 63,292
Unrealized Losses | 7,258 | 8,699
Held-to-maturity securities: |  |
Fair value, less than 12 months |  | 148,771
Unrealized losses, less than 12 months |  | 9,402
Fair value, more than 12 months |  | 199,649
Unrealized losses, more than 12 months |  | 41,062
Fair Value |  | 348,420
Unrealized Losses |  | 50,464
Other debt securities |  |
Available-for-sale securities: |  |
Fair value, less than 12 months | 0 |
Unrealized losses, less than 12 months | 0 |
Fair value, more than 12 months | 1,890 |
Unrealized losses, more than 12 months | 120 |
Fair Value | 1,890 |
Unrealized Losses | $ 120 |
Held-to-maturity securities: |  |
Fair value, less than 12 months |  | 224,974
Unrealized losses, less than 12 months |  | 12,625
Fair value, more than 12 months |  | 268,951
Unrealized losses, more than 12 months |  | 52,238
Fair Value |  | 493,925
Unrealized Losses |  | 64,863
Obligations of states and political subdivisions |  |
Held-to-maturity securities: |  |
Fair value, less than 12 months |  | 8,091
Unrealized losses, less than 12 months |  | 409
Fair value, more than 12 months |  | 2,139
Unrealized losses, more than 12 months |  | 361
Fair Value |  | 10,230
Unrealized Losses |  | $ 770

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