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Securities, Available-for-sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Available-for-sale [Abstract] |  |
Amortized cost | $ 1,253,750 | $ 1,301,244
Gross unrealized gains | 374 | 245
Gross unrealized losses | (142,619) | (137,765)
Fair value | 1,111,505 | 1,163,724
U.S. Treasury and Government Agencies [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 367,961 | 381,268
Gross unrealized gains | 115 | 121
Gross unrealized losses | (27,575) | (26,572)
Fair value | 340,501 | 354,817
State and Political Subdivisions [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 311,207 | 313,147
Gross unrealized gains | 31 | 88
Gross unrealized losses | (49,808) | (48,290)
Fair value | 261,430 | 264,945
U.S. Government Sponsored Agency Mortgage-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 500,922 | 518,836
Gross unrealized gains | 228 | 36
Gross unrealized losses | (64,774) | (62,136)
Fair value | 436,376 | 456,736
Asset-backed Securities [Member] |  |
Available-for-sale [Abstract] |  |
Amortized cost | 73,660 | 87,993
Gross unrealized gains | 0 | 0
Gross unrealized losses | (462) | (767)
Fair value | $ 73,198 | $ 87,226

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