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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | $ 541,597 | $ 430,295
Gross Unrealized Gains | 133 | 5,773
Gross Unrealized Losses | (48,388) | (1,396)
Allowance for Credit Losses | (558) | (614)
Fair Value | 493,342 | 434,672
Securities held-to-maturity, net | 541,039 | 429,681
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,491,748 | 1,358,960
Gross Unrealized Gains | 1,263 | 15,247
Gross Unrealized Losses | (100,567) | (8,201)
Securities available-for-sale | 1,392,444 | 1,366,006
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 247,906 | 175,409
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | (12,322) | (1,901)
Securities available-for-sale | 235,584 | 173,511
Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 352,799 | 236,379
Gross Unrealized Gains | 10 | 1,794
Gross Unrealized Losses | (40,625) | (730)
Fair Value | 312,184 | 237,443
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 508,912 | 571,587
Gross Unrealized Gains | 61 | 5,907
Gross Unrealized Losses | (59,615) | (2,410)
Securities available-for-sale | 449,358 | 575,084
Agency mortgage-backed securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 63,281 | 68,105
Gross Unrealized Gains | 0 | 940
Gross Unrealized Losses | (2,970) | (666)
Fair Value | 60,311 | 68,379
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 607,080 | 509,243
Gross Unrealized Gains | 1,034 | 8,485
Gross Unrealized Losses | (27,918) | (3,869)
Securities available-for-sale | 580,196 | 513,859
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 116,100 | 90,971
Gross Unrealized Gains | 77 | 220
Gross Unrealized Losses | (596) | (21)
Securities available-for-sale | 115,581 | 91,170
Corporate debt securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 125,517 | 125,811
Gross Unrealized Gains | 123 | 3,039
Gross Unrealized Losses | (4,793) | 0
Fair Value | 120,847 | 128,850
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 11,750 | 11,750
Gross Unrealized Gains | 91 | 632
Gross Unrealized Losses | (116) | 0
Securities available-for-sale | $ 11,725 | $ 12,382

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