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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,150,563 | $ 1,221,496
Gross Unrealized Gains | 52 | 74
Gross Unrealized Losses | (81,647) | (99,740)
Fair Value | 1,068,968 | 1,121,830
Allowance for credit losses - held to maturity securities | (32) | (32)
Held to maturity securities, net of allowance for credit losses | 1,150,531 | 1,221,464
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 285,450 | 288,154
Gross Unrealized Gains | 38 | 74
Gross Unrealized Losses | (34,861) | (33,688)
Fair Value | 250,627 | 254,540
Residential mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 363,095 | 387,208
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (23,736) | (31,670)
Fair Value | 339,359 | 355,538
Residential mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 386,654 | 426,264
Gross Unrealized Gains | 14 | 0
Gross Unrealized Losses | (11,742) | (20,314)
Fair Value | 374,926 | 405,950
Commercial mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 16,966 | 16,983
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,404) | (2,972)
Fair Value | 14,562 | 14,011
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 43,966 | 44,514
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6,326) | (6,977)
Fair Value | 37,640 | 37,537
Other debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 54,432 | 58,373
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,578) | (4,119)
Fair Value | $ 51,854 | $ 54,254

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