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Securities - Fair Value and Unrealized Losses on Debt Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Sep. 30, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Available-for-sale: |  |
Estimated Fair Value | $ 5,406 | $ 296,224
Unrealized Losses | (119) | (20,715)
Estimated Fair Value | 490,586 | 239,756
Unrealized Losses | (74,098) | (40,391)
Estimated Fair Value | 495,992 | 535,980
Unrealized Losses | $ (74,217) | $ (61,106)
Number of Securities | security | 223 | 219
Held-to-maturity: |  |
Estimated Fair Value | $ 464 | $ 32,273
Unrealized Losses | (4) | (5,677)
Estimated Fair Value | 30,307 | 401
Unrealized Losses | (6,614) | (15)
Estimated Fair Value | 30,771 | 32,674
Unrealized Losses | $ (6,618) | $ (5,692)
Number of Securities | security | 27 | 23
U.S. treasury |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 25,702
Unrealized Losses | 0 | (967)
Estimated Fair Value | 52,853 | 30,947
Unrealized Losses | (5,625) | (4,394)
Estimated Fair Value | 52,853 | 56,649
Unrealized Losses | $ (5,625) | $ (5,361)
Number of Securities | security | 9 | 10
U.S. agency |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 0
Unrealized Losses | 0 | 0
Estimated Fair Value | 2,055 | 2,834
Unrealized Losses | (34) | (47)
Estimated Fair Value | 2,055 | 2,834
Unrealized Losses | $ (34) | $ (47)
Number of Securities | security | 7 | 7
Obligations of states and political subdivisions |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 21,676
Unrealized Losses | 0 | (3,784)
Estimated Fair Value | 24,488 | 2,753
Unrealized Losses | (5,453) | (1,214)
Estimated Fair Value | 24,488 | 24,429
Unrealized Losses | $ (5,453) | $ (4,998)
Number of Securities | security | 19 | 18
Held-to-maturity: |  |
Estimated Fair Value | $ 329 | $ 20,153
Unrealized Losses | (4) | (4,891)
Estimated Fair Value | 19,698 | 0
Unrealized Losses | (5,469) | 0
Estimated Fair Value | 20,027 | 20,153
Unrealized Losses | $ (5,473) | $ (4,891)
Number of Securities | security | 9 | 8
Mortgage backed - residential |  |
Available-for-sale: |  |
Estimated Fair Value | $ 320 | $ 51,921
Unrealized Losses | (4) | (2,939)
Estimated Fair Value | 100,233 | 63,691
Unrealized Losses | (18,418) | (10,887)
Estimated Fair Value | 100,553 | 115,612
Unrealized Losses | $ (18,422) | $ (13,826)
Number of Securities | security | 88 | 87
Held-to-maturity: |  |
Estimated Fair Value | $ 135 | $ 7,993
Unrealized Losses | 0 | (511)
Estimated Fair Value | 6,888 | 0
Unrealized Losses | (815) | 0
Estimated Fair Value | 7,023 | 7,993
Unrealized Losses | $ (815) | $ (511)
Number of Securities | security | 13 | 10
Collateralized mortgage obligations |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 111,360
Unrealized Losses | 0 | (4,631)
Estimated Fair Value | 184,457 | 92,905
Unrealized Losses | (24,492) | (16,663)
Estimated Fair Value | 184,457 | 204,265
Unrealized Losses | $ (24,492) | $ (21,294)
Number of Securities | security | 66 | 66
Held-to-maturity: |  |
Estimated Fair Value | $ 0 | $ 4,127
Unrealized Losses | 0 | (275)
Estimated Fair Value | 3,721 | 401
Unrealized Losses | (330) | (15)
Estimated Fair Value | 3,721 | 4,528
Unrealized Losses | $ (330) | $ (290)
Number of Securities | security | 5 | 5
Mortgage backed - commercial |  |
Available-for-sale: |  |
Estimated Fair Value | $ 5,086 | $ 70,710
Unrealized Losses | (115) | (6,475)
Estimated Fair Value | 111,825 | 46,626
Unrealized Losses | (17,964) | (7,186)
Estimated Fair Value | 116,911 | 117,336
Unrealized Losses | $ (18,079) | $ (13,661)
Number of Securities | security | 25 | 22
Other debt |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 14,855
Unrealized Losses | 0 | (1,919)
Estimated Fair Value | 14,675 | 0
Unrealized Losses | (2,112) | 0
Estimated Fair Value | 14,675 | 14,855
Unrealized Losses | $ (2,112) | $ (1,919)
Number of Securities | security | 9 | 9

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