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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | $ 439,112 | $ 488,059
Gross Unrealized Gains | 7,465 | 13,960
Gross Unrealized Losses | (1,952) | (496)
Allowance for Credit Losses | (640) | (449)
Fair Value | 444,625 | 501,523
Debt Securities, Held-To-Maturity, Net Of Allowance For Credit Losses | 438,472 | 487,610
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,211,293 | 882,682
Gross Unrealized Gains | 16,803 | 30,104
Gross Unrealized Losses | (8,282) | (357)
Securities available-for-sale | 1,219,814 | 912,429
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 115,567 | 14,978
Gross Unrealized Gains | 35 | 186
Gross Unrealized Losses | (665) | (3)
Securities available-for-sale | 114,937 | 15,161
Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 238,031 | 248,324
Gross Unrealized Gains | 1,302 | 2,814
Gross Unrealized Losses | (1,634) | 0
Fair Value | 237,699 | 251,138
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 516,659 | 335,271
Gross Unrealized Gains | 3,641 | 8,994
Gross Unrealized Losses | (4,884) | (33)
Securities available-for-sale | 515,416 | 344,232
Agency mortgage-backed securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 74,972 | 112,742
Gross Unrealized Gains | 1,303 | 2,295
Gross Unrealized Losses | (318) | (496)
Fair Value | 75,957 | 114,541
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 496,330 | 506,703
Gross Unrealized Gains | 12,166 | 20,190
Gross Unrealized Losses | (2,730) | (321)
Securities available-for-sale | 505,766 | 526,572
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 70,987 | 10,980
Gross Unrealized Gains | 308 | 486
Gross Unrealized Losses | (3) | 0
Securities available-for-sale | 71,292 | 11,466
Corporate debt securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 126,109 | 126,993
Gross Unrealized Gains | 4,860 | 8,851
Gross Unrealized Losses | 0 | 0
Fair Value | 130,969 | 135,844
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 11,750 | 14,750
Gross Unrealized Gains | 653 | 248
Gross Unrealized Losses | 0 | 0
Securities available-for-sale | $ 12,403 | $ 14,998

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