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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | $ 1,358,960 | $ 882,682
Gross Unrealized Gains | 15,247 | 30,104
Gross Unrealized Losses | (8,201) | (357)
Securities available-for-sale | 1,366,006 | 912,429
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 430,295 | 488,059
Gross Unrealized Gains | 5,773 | 13,960
Gross Unrealized Losses | (1,396) | (496)
Allowance for Credit Losses | (614) | (449)
Debt Securities, Held-to-maturity, Fair Value | 434,672 | 501,523
debt securities, held to maturity, net of alloawance for credit losses | 429,681 | 487,610
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 175,409 | 14,978
Gross Unrealized Gains | 3 | 186
Gross Unrealized Losses | (1,901) | (3)
Securities available-for-sale | 173,511 | 15,161
Obligations of states and political subdivisions |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 571,587 | 335,271
Gross Unrealized Gains | 5,907 | 8,994
Gross Unrealized Losses | (2,410) | (33)
Securities available-for-sale | 575,084 | 344,232
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 236,379 | 248,324
Gross Unrealized Gains | 1,794 | 2,814
Gross Unrealized Losses | (730) | 0
Debt Securities, Held-to-maturity, Fair Value | 237,443 | 251,138
Agency mortgage-backed securities |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 509,243 | 506,703
Gross Unrealized Gains | 8,485 | 20,190
Gross Unrealized Losses | (3,869) | (321)
Securities available-for-sale | 513,859 | 526,572
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 68,105 | 112,742
Gross Unrealized Gains | 940 | 2,295
Gross Unrealized Losses | (666) | (496)
Debt Securities, Held-to-maturity, Fair Value | 68,379 | 114,541
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 11,750 | 14,750
Gross Unrealized Gains | 632 | 248
Gross Unrealized Losses | 0 | 0
Securities available-for-sale | 12,382 | 14,998
Corporate Debt Securities [Member] |  |
Debt Securities, Available-for-sale [Abstract] |  |
Amortized Cost | 90,971 | 10,980
Gross Unrealized Gains | 220 | 486
Gross Unrealized Losses | (21) | 0
Securities available-for-sale | 91,170 | 11,466
Debt Securities, Held-to-maturity [Abstract] |  |
Amortized Cost | 125,811 | 126,993
Gross Unrealized Gains | 3,039 | 8,851
Gross Unrealized Losses | 0 | 0
Debt Securities, Held-to-maturity, Fair Value | $ 128,850 | $ 135,844

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