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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,126,144 | $ 1,221,496
Gross Unrealized Gains | 3 | 74
Gross Unrealized Losses | (123,603) | (99,740)
Fair Value | 1,002,544 | 1,121,830
Allowance for credit losses - held to maturity securities | (32) | (32)
Held-to-maturity securities, net of allowance for credit losses | 1,126,112 | 1,221,464
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 284,542 | 288,154
Gross Unrealized Gains | 3 | 74
Gross Unrealized Losses | (42,491) | (33,688)
Fair Value | 242,054 | 254,540
Residential mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 354,882 | 387,208
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (41,506) | (31,670)
Fair Value | 313,376 | 355,538
Other debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 53,683 | 58,373
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,080) | (4,119)
Fair Value | 49,603 | 54,254
Government agency mortgage-backed securities | Residential mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 372,414 | 426,264
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (25,251) | (20,314)
Fair Value | 347,163 | 405,950
Government agency mortgage-backed securities | Commercial mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 16,961 | 16,983
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,958) | (2,972)
Fair Value | 14,003 | 14,011
Government agency collateralized mortgage obligations | Commercial mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 43,662 | 44,514
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,317) | (6,977)
Fair Value | $ 36,345 | $ 37,537

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