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Securities - Amortized Cost and Fair Value, Held to Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 1,076,849 | $ 1,126,144
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (92,490) | (123,603)
Fair Value | 984,359 | 1,002,544
Allowance for credit losses - held to maturity securities | (32) | (32)
Held to maturity securities, net of allowance for credit losses | 1,076,817 | 1,126,112
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 281,456 | 284,542
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (40,761) | (42,491)
Fair Value | 240,695 | 242,054
Residential mortgage backed securities: |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 337,493 | 354,882
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (25,999) | (41,506)
Fair Value | 311,494 | 313,376
Residential mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 348,360 | 372,414
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (14,376) | (25,251)
Fair Value | 333,984 | 347,163
Commercial mortgage backed securities: | Government agency mortgage backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 16,949 | 16,961
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,379) | (2,958)
Fair Value | 14,570 | 14,003
Commercial mortgage backed securities: | Government agency collateralized mortgage obligations |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 42,807 | 43,662
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (6,371) | (7,317)
Fair Value | 36,436 | 36,345
Other debt securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 49,784 | 53,683
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,604) | (4,080)
Fair Value | $ 47,180 | $ 49,603

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