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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | $ 647,082 | $ 430,295
Gross Unrealized Gains | 149 | 5,773
Gross Unrealized Losses | (109,443) | (1,396)
Allowance for Credit Losses | (689) | (614)
Fair Value | 537,788 | 434,672
Securities held-to-maturity, net | 646,393 | 429,681
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,692,587 | 1,358,960
Gross Unrealized Gains | 28 | 15,247
Gross Unrealized Losses | (225,703) | (8,201)
Securities available-for-sale | 1,466,912 | 1,366,006
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 263,717 | 175,409
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (28,778) | (1,901)
Securities available-for-sale | 234,939 | 173,511
Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 463,941 | 236,379
Gross Unrealized Gains | 0 | 1,794
Gross Unrealized Losses | (88,973) | (730)
Fair Value | 374,968 | 237,443
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 509,274 | 571,587
Gross Unrealized Gains | 27 | 5,907
Gross Unrealized Losses | (120,283) | (2,410)
Securities available-for-sale | 389,018 | 575,084
Agency mortgage-backed securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 58,221 | 68,105
Gross Unrealized Gains | 0 | 940
Gross Unrealized Losses | (6,277) | (666)
Fair Value | 51,944 | 68,379
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 692,187 | 509,243
Gross Unrealized Gains | 1 | 8,485
Gross Unrealized Losses | (70,900) | (3,869)
Securities available-for-sale | 621,288 | 513,859
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 213,659 | 90,971
Gross Unrealized Gains | 0 | 220
Gross Unrealized Losses | (4,905) | (21)
Securities available-for-sale | 208,754 | 91,170
Corporate debt securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 124,920 | 125,811
Gross Unrealized Gains | 149 | 3,039
Gross Unrealized Losses | (14,193) | 0
Fair Value | 110,876 | 128,850
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 13,750 | 11,750
Gross Unrealized Gains | 0 | 632
Gross Unrealized Losses | (837) | 0
Securities available-for-sale | $ 12,913 | $ 12,382

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