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Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | $ 488,059 | $ 181,166
Gross Unrealized Gains | 13,960 | 973
Gross Unrealized Losses | (496) | (200)
Fair Value | 501,523 | 181,939
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 449 |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 882,682 | 1,115,323
Gross Unrealized Gains | 30,104 | 21,548
Gross Unrealized Losses | (357) | (1,554)
Fair Value | 912,429 | 1,135,317
debt securities, held to maturity, net of alloawance for credit losses | 487,610 | 181,166
Corporate Debt Securities [Member] |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 126,993 | 123,116
Gross Unrealized Gains | 8,851 | 128
Gross Unrealized Losses | 0 | (200)
Fair Value | 135,844 | 123,044
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 14,750 |
Gross Unrealized Gains | 248 |
Gross Unrealized Losses | 0 |
Fair Value | 14,998 |
Obligations of U.S. Government-sponsored enterprises |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 14,978 | 9,954
Gross Unrealized Gains | 186 | 92
Gross Unrealized Losses | (3) | 0
Fair Value | 15,161 | 10,046
Obligations of states and political subdivisions |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 248,324 | 11,704
Gross Unrealized Gains | 2,814 | 170
Gross Unrealized Losses | 0 | 0
Fair Value | 251,138 | 11,874
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 335,271 | 207,269
Gross Unrealized Gains | 8,994 | 6,118
Gross Unrealized Losses | (33) | (363)
Fair Value | 344,232 | 213,024
Residential mortgage-backed securities |  |
Schedule of Held-to-maturity Securities [Line Items] |  |
Amortized Cost | 112,742 | 46,346
Gross Unrealized Gains | 2,295 | 675
Gross Unrealized Losses | (496) | 0
Fair Value | 114,541 | 47,021
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 506,703 | 888,129
Gross Unrealized Gains | 20,190 | 15,083
Gross Unrealized Losses | (321) | (1,191)
Fair Value | 526,572 | 902,021
US Treasury Bill Securities [Member] |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 10,980 | 9,971
Gross Unrealized Gains | 486 | 255
Gross Unrealized Losses | 0 | 0
Fair Value | $ 11,466 | $ 10,226

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