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Investment Securities - Securities Temporarily Impaired (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | $ 251,182 | $ 273,453
Unrealized Losses (Less than 12 months) | (23,126) | (6,144)
Fair Value (Estimated) (12 months or more) | 310,159 | 55,942
Unrealized Losses (12 months or more) | (88,620) | (2,297)
Fair Value (Estimated) | 561,341 | 329,395
Unrealized Losses | (111,746) | (8,441)
U.S. Government-sponsored agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 4,804 | 24,030
Unrealized Losses (Less than 12 months) | (675) | (920)
Fair Value (Estimated) (12 months or more) | 41,965 | 29,170
Unrealized Losses (12 months or more) | (16,680) | (1,375)
Fair Value (Estimated) | 46,769 | 53,200
Unrealized Losses | (17,355) | (2,295)
Mortgage-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 73,509 | 216,461
Unrealized Losses (Less than 12 months) | (6,486) | (4,768)
Fair Value (Estimated) (12 months or more) | 197,102 | 26,772
Unrealized Losses (12 months or more) | (47,353) | (922)
Fair Value (Estimated) | 270,611 | 243,233
Unrealized Losses | (53,839) | (5,690)
State and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 149,517 | 29,528
Unrealized Losses (Less than 12 months) | (13,769) | (390)
Fair Value (Estimated) (12 months or more) | 67,932 | 0
Unrealized Losses (12 months or more) | (24,247) | 0
Fair Value (Estimated) | 217,449 | 29,528
Unrealized Losses | (38,016) | (390)
Asset-backed securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 3,495 |
Unrealized Losses (Less than 12 months) | (53) |
Fair Value (Estimated) (12 months or more) | 0 |
Unrealized Losses (12 months or more) | 0 |
Fair Value (Estimated) | 3,495 |
Unrealized Losses | (53) |
Corporate securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Fair Value (Estimated) (Less than 12 months) | 19,857 | 3,434
Unrealized Losses (Less than 12 months) | (2,143) | (66)
Fair Value (Estimated) (12 months or more) | 3,160 | 0
Unrealized Losses (12 months or more) | (340) | 0
Fair Value (Estimated) | 23,017 | 3,434
Unrealized Losses | $ (2,483) | $ (66)

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