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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 1,769,134 | $ 1,729,054
Gross Unrealized Gains | 1,603 | 481
Gross Unrealized Losses | (152,464) | (193,728)
Securities available-for-sale | 1,618,273 | 1,535,807
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 751,219 | 710,650
Gross Unrealized Gains | 7,294 | 2,484
Gross Unrealized Losses | (61,866) | (84,617)
Allowance for credit losses | (785) | (735)
Debt Securities, Held-to-maturity, Fair Value | 696,647 | 628,517
Total securities held-to-maturity, net | 750,434 | 709,915
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 316,511 | 266,090
Gross Unrealized Gains | 303 | 0
Gross Unrealized Losses | (20,368) | (28,305)
Securities available-for-sale | 296,446 | 237,785
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 500,881 | 507,842
Gross Unrealized Gains | 57 | 27
Gross Unrealized Losses | (68,767) | (90,425)
Securities available-for-sale | 432,171 | 417,444
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 575,699 | 529,012
Gross Unrealized Gains | 7,078 | 2,321
Gross Unrealized Losses | (47,461) | (65,347)
Debt Securities, Held-to-maturity, Fair Value | 535,316 | 465,986
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 758,283 | 727,931
Gross Unrealized Gains | 1,181 | 453
Gross Unrealized Losses | (59,083) | (68,980)
Securities available-for-sale | 700,381 | 659,404
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 52,100 | 57,018
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (5,424) | (6,416)
Debt Securities, Held-to-maturity, Fair Value | 46,676 | 50,602
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 8,750 | 13,750
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,176) | (1,110)
Securities available-for-sale | 7,574 | 12,640
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 184,709 | 213,441
Gross Unrealized Gains | 62 | 1
Gross Unrealized Losses | (3,070) | (4,908)
Securities available-for-sale | 181,701 | 208,534
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 123,420 | 124,620
Gross Unrealized Gains | 216 | 163
Gross Unrealized Losses | (8,981) | (12,854)
Debt Securities, Held-to-maturity, Fair Value | $ 114,655 | $ 111,929

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