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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
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Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | $ 451,114 | $ 488,059
Gross Unrealized Gains | 8,942 | 13,960
Gross Unrealized Losses | (1,031) | (496)
Allowance for Credit Losses | (449) | (449)
Fair Value | 459,025 | 501,523
Total securities held-to-maturity, net | 450,665 | 487,610
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 1,065,223 | 882,682
Gross Unrealized Gains | 21,824 | 30,104
Gross Unrealized Losses | (2,824) | (357)
Fair Value | 1,084,223 | 912,429
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 99,490 | 14,978
Gross Unrealized Gains | 93 | 186
Gross Unrealized Losses | (329) | (3)
Fair Value | 99,254 | 15,161
Obligations of states and political subdivisions |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 240,163 | 248,324
Gross Unrealized Gains | 1,845 | 2,814
Gross Unrealized Losses | (763) | 0
Fair Value | 241,245 | 251,138
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 475,710 | 335,271
Gross Unrealized Gains | 6,328 | 8,994
Gross Unrealized Losses | (1,193) | (33)
Fair Value | 480,845 | 344,232
Agency mortgage-backed securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 84,544 | 112,742
Gross Unrealized Gains | 1,403 | 2,295
Gross Unrealized Losses | (268) | (496)
Fair Value | 85,679 | 114,541
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 464,288 | 506,703
Gross Unrealized Gains | 14,393 | 20,190
Gross Unrealized Losses | (1,302) | (321)
Fair Value | 477,379 | 526,572
U.S. Treasury bills |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 10,985 | 10,980
Gross Unrealized Gains | 361 | 486
Gross Unrealized Losses | 0 | 0
Fair Value | 11,346 | 11,466
Corporate debt securities |  |
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 126,407 | 126,993
Gross Unrealized Gains | 5,694 | 8,851
Gross Unrealized Losses | 0 | 0
Fair Value | 132,101 | 135,844
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 14,750 | 14,750
Gross Unrealized Gains | 649 | 248
Gross Unrealized Losses | 0 | 0
Fair Value | $ 15,399 | $ 14,998

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