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Securities - Fair Value and Unrealized Losses on Debt Securities in Continuous Unrealized Loss Position (Details) $ in Thousands | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security
--- | --- | ---
Available-for-sale: |  |
Estimated Fair Value | $ 4,721 | $ 296,224
Unrealized Losses | (27) | (20,715)
Estimated Fair Value | 494,328 | 239,756
Unrealized Losses | (60,687) | (40,391)
Estimated Fair Value | 499,049 | 535,980
Unrealized Losses | $ (60,714) | $ (61,106)
Number of Securities | security | 216 | 219
Held-to-maturity: |  |
Estimated Fair Value | $ 0 | $ 32,273
Unrealized Losses | 0 | (5,677)
Estimated Fair Value | 31,701 | 401
Unrealized Losses | (4,807) | (15)
Estimated Fair Value | 31,701 | 32,674
Gross Unrealized Losses | $ (4,807) | $ (5,692)
Number of Securities | security | 23 | 23
U.S. treasury |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 25,702
Unrealized Losses | 0 | (967)
Estimated Fair Value | 54,234 | 30,947
Unrealized Losses | (4,234) | (4,394)
Estimated Fair Value | 54,234 | 56,649
Unrealized Losses | $ (4,234) | $ (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 | 1,839 | 2,834
Unrealized Losses | (33) | (47)
Estimated Fair Value | 1,839 | 2,834
Unrealized Losses | $ (33) | $ (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 | 25,970 | 2,753
Unrealized Losses | (4,009) | (1,214)
Estimated Fair Value | 25,970 | 24,429
Unrealized Losses | $ (4,009) | $ (4,998)
Number of Securities | security | 19 | 18
Held-to-maturity: |  |
Estimated Fair Value | $ 0 | $ 20,153
Unrealized Losses | 0 | (4,891)
Estimated Fair Value | 21,223 | 0
Unrealized Losses | (3,987) | 0
Estimated Fair Value | 21,223 | 20,153
Gross Unrealized Losses | $ (3,987) | $ (4,891)
Number of Securities | security | 8 | 8
Mortgage backed - residential |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 51,921
Unrealized Losses | 0 | (2,939)
Estimated Fair Value | 100,571 | 63,691
Unrealized Losses | (14,974) | (10,887)
Estimated Fair Value | 100,571 | 115,612
Unrealized Losses | $ (14,974) | $ (13,826)
Number of Securities | security | 83 | 87
Held-to-maturity: |  |
Estimated Fair Value | $ 0 | $ 7,993
Unrealized Losses | 0 | (511)
Estimated Fair Value | 6,845 | 0
Unrealized Losses | (560) | 0
Estimated Fair Value | 6,845 | 7,993
Gross Unrealized Losses | $ (560) | $ (511)
Number of Securities | security | 10 | 10
Collateralized mortgage obligations |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 111,360
Unrealized Losses | 0 | (4,631)
Estimated Fair Value | 181,533 | 92,905
Unrealized Losses | (21,861) | (16,663)
Estimated Fair Value | 181,533 | 204,265
Unrealized Losses | $ (21,861) | $ (21,294)
Number of Securities | security | 65 | 66
Held-to-maturity: |  |
Estimated Fair Value | $ 0 | $ 4,127
Unrealized Losses | 0 | (275)
Estimated Fair Value | 3,633 | 401
Unrealized Losses | (260) | (15)
Estimated Fair Value | 3,633 | 4,528
Gross Unrealized Losses | $ (260) | $ (290)
Number of Securities | security | 5 | 5
Mortgage backed - commercial |  |
Available-for-sale: |  |
Estimated Fair Value | $ 4,721 | $ 70,710
Unrealized Losses | (27) | (6,475)
Estimated Fair Value | 114,625 | 46,626
Unrealized Losses | (14,340) | (7,186)
Estimated Fair Value | 119,346 | 117,336
Unrealized Losses | $ (14,367) | $ (13,661)
Number of Securities | security | 24 | 22
Other debt |  |
Available-for-sale: |  |
Estimated Fair Value | $ 0 | $ 14,855
Unrealized Losses | 0 | (1,919)
Estimated Fair Value | 15,556 | 0
Unrealized Losses | (1,236) | 0
Estimated Fair Value | 15,556 | 14,855
Unrealized Losses | $ (1,236) | $ (1,919)
Number of Securities | security | 9 | 9

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