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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | $ 96,442 | $ 251,182 | $ 337,576
Unrealized Losses (Less than 12 months) | (7,156) | (23,126) | (61,255)
Fair Value (Estimated) (12 months or more) | 453,732 | 310,159 | 223,562
Unrealized Losses (12 months or more) | (136,976) | (88,620) | (67,276)
Fair Value (Estimated) | 550,174 | 561,341 | 561,138
Unrealized Losses | (144,132) | (111,746) | (128,531)
U.S. Treasury & Agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 11,842 | 4,804 | 7,364
Unrealized Losses (Less than 12 months) | (40) | (675) | (1,264)
Fair Value (Estimated) (12 months or more) | 44,577 | 41,965 | 39,452
Unrealized Losses (12 months or more) | (19,555) | (16,680) | (16,043)
Fair Value (Estimated) | 56,419 | 46,769 | 46,816
Unrealized Losses | (19,595) | (17,355) | (17,307)
Mortgage-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 18,017 | 73,509 | 109,041
Unrealized Losses (Less than 12 months) | (441) | (6,486) | (13,868)
Fair Value (Estimated) (12 months or more) | 238,150 | 197,102 | 162,979
Unrealized Losses (12 months or more) | (63,825) | (47,353) | (41,957)
Fair Value (Estimated) | 256,167 | 270,611 | 272,020
Unrealized Losses | (64,266) | (53,839) | (55,825)
State and political subdivisions |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 66,583 | 149,517 | 197,145
Unrealized Losses (Less than 12 months) | (6,675) | (13,769) | (44,277)
Fair Value (Estimated) (12 months or more) | 147,818 | 67,932 | 17,902
Unrealized Losses (12 months or more) | (49,769) | (24,247) | (9,005)
Fair Value (Estimated) | 214,401 | 217,449 | 215,047
Unrealized Losses | (56,444) | (38,016) | (53,282)
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 3,495 | 3,840
Unrealized Losses (Less than 12 months) | 0 | (53) | (32)
Fair Value (Estimated) (12 months or more) | 1,510 | 0 | 0
Unrealized Losses (12 months or more) | (4) | 0 | 0
Fair Value (Estimated) | 1,510 | 3,495 | 3,840
Unrealized Losses | (4) | (53) | (32)
Corporate securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Fair Value (Estimated) (Less than 12 months) | 0 | 19,857 | 20,186
Unrealized Losses (Less than 12 months) | 0 | (2,143) | (1,814)
Fair Value (Estimated) (12 months or more) | 21,677 | 3,160 | 3,229
Unrealized Losses (12 months or more) | (3,823) | (340) | (271)
Fair Value (Estimated) | 21,677 | 23,017 | 23,415
Unrealized Losses | $ (3,823) | $ (2,483) | $ (2,085)

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