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Investment Securities (Gross Unrealized Losses and Fair Value by Length of Continuous Unrealized Loss Position) (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available-for-sale securities: |  |
Fair value, less than 12 months | $ 1,029 | $ 32,180
Unrealized losses, less than 12 months | 5 | 2,541
Fair value, more than 12 months | 71,358 | 50,752
Unrealized losses, more than 12 months | 13,934 | 9,878
Fair Value | 72,387 | 82,932
Unrealized Losses | 13,939 | 12,419
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
U.S. Government agencies |  |
Available-for-sale securities: |  |
Fair value, less than 12 months | 596 | 1,165
Unrealized losses, less than 12 months | 1 | 4
Fair value, more than 12 months | 16,352 | 16,585
Unrealized losses, more than 12 months | 3,994 | 3,621
Fair Value | 16,948 | 17,750
Unrealized Losses | 3,995 | 3,625
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-residential |  |
Available-for-sale securities: |  |
Fair value, less than 12 months | 433 | 29,125
Unrealized losses, less than 12 months | 4 | 2,409
Fair value, more than 12 months | 53,140 | 34,167
Unrealized losses, more than 12 months | 9,794 | 6,257
Fair Value | 53,573 | 63,292
Unrealized Losses | 9,798 | 8,666
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 | 1,890
Unrealized losses, less than 12 months | 0 | 128
Fair value, more than 12 months | 1,866 | 0
Unrealized losses, more than 12 months | 146 | 0
Fair Value | 1,866 | 1,890
Unrealized Losses | $ 146 | 128
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
States and political subdivisions |  |
Held-to-maturity securities: |  |
Fair value, less than 12 months |  | 780
Unrealized losses, less than 12 months |  | 28
Fair value, more than 12 months |  | 0
Unrealized losses, more than 12 months |  | 0
Fair Value |  | 780
Unrealized Losses |  | $ 28

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