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v3.20.2

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019
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Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | $ 346,436 |  | $ 181,166
Gross Unrealized Gains | 10,498 |  | 973
Gross Unrealized Losses | (150) |  | (200)
Allowance for Credit Losses | 645 | $ 0 |
Fair Value | 356,139 |  | 181,939
Total securities held-to-maturity, net | 345,791 |  | 181,166
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 960,984 |  | 1,115,323
Gross Unrealized Gains | 37,259 |  | 21,548
Gross Unrealized Losses | (139) |  | (1,554)
Allowance for Credit Losses | 0 |  |
Fair Value | 998,104 |  | 1,135,317
Obligations of U.S. Government-sponsored enterprises |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 9,966 |  | 9,954
Gross Unrealized Gains | 275 |  | 92
Gross Unrealized Losses | 0 |  | 0
Allowance for Credit Losses | 0 |  |
Fair Value | 10,241 |  | 10,046
Obligations of states and political subdivisions |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | 96,547 |  | 11,704
Gross Unrealized Gains | 336 |  | 170
Gross Unrealized Losses | (122) |  | 0
Allowance for Credit Losses | 16 |  |
Fair Value | 96,745 |  | 11,874
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 245,961 |  | 207,269
Gross Unrealized Gains | 8,450 |  | 6,118
Gross Unrealized Losses | (133) |  | (363)
Allowance for Credit Losses | 0 |  |
Fair Value | 254,278 |  | 213,024
Agency mortgage-backed securities |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | 127,353 |  | 46,346
Gross Unrealized Gains | 2,469 |  | 675
Gross Unrealized Losses | (28) |  | 0
Allowance for Credit Losses | 0 |  |
Fair Value | 129,794 |  | 47,021
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 693,082 |  | 888,129
Gross Unrealized Gains | 27,915 |  | 15,083
Gross Unrealized Losses | (6) |  | (1,191)
Allowance for Credit Losses | 0 |  |
Fair Value | 720,991 |  | 902,021
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 9,975 |  | 9,971
Gross Unrealized Gains | 591 |  | 255
Gross Unrealized Losses | 0 |  | 0
Allowance for Credit Losses | 0 |  |
Fair Value | 10,566 |  | 10,226
Corporate Debt Securities [Member] |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | 122,536 |  | 123,116
Gross Unrealized Gains | 7,693 |  | 128
Gross Unrealized Losses | 0 |  | (200)
Allowance for Credit Losses | 629 |  |
Fair Value | 129,600 |  | $ 123,044
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 2,000 |  |
Gross Unrealized Gains | 28 |  |
Gross Unrealized Losses | 0 |  |
Fair Value | $ 2,028 |  |

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