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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,199,143 | $ 1,221,496
Gross Unrealized Gains | 51 | 74
Gross Unrealized Losses | (114,109) | (99,740)
Fair Value | 1,085,085 | 1,121,830
Allowance for credit losses - held to maturity securities | (32) | (32)
Held to maturity securities, net of allowance for credit losses | 1,199,111 | 1,221,464
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 287,255 | 288,154
Gross Unrealized Gains | 51 | 74
Gross Unrealized Losses | (37,550) | (33,688)
Fair Value | 249,756 | 254,540
Residential mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 379,244 | 387,208
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (36,971) | (31,670)
Fair Value | 342,273 | 355,538
Residential mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 414,485 | 426,264
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (24,465) | (20,314)
Fair Value | 390,020 | 405,950
Commercial mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 16,977 | 16,983
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,056) | (2,972)
Fair Value | 13,921 | 14,011
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 44,360 | 44,514
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (7,411) | (6,977)
Fair Value | 36,949 | 37,537
Other debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 56,822 | 58,373
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,656) | (4,119)
Fair Value | $ 52,166 | $ 54,254

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