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v3.20.1

Investments - Schedule of Available-for-sale and Held-to-Maturity Securities Reconciliation (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019
--- | --- | --- | ---
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | $ 179,235 |  | $ 181,166
Gross Unrealized Gains | 2,239 |  | 973
Gross Unrealized Losses | (3,090) |  | (200)
Allowance for Credit Losses | 303 | $ 0 |
Fair Value | 178,081 |  | 181,939
Total securities held-to-maturity, net | 178,932 |  | 181,166
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 1,127,494 |  | 1,115,323
Gross Unrealized Gains | 34,721 |  | 21,548
Gross Unrealized Losses | (701) |  | (1,554)
Allowance for Credit Losses | 0 |  |
Fair Value | 1,161,514 |  | 1,135,317
Obligations of U.S. Government-sponsored enterprises |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 9,960 |  | 9,954
Gross Unrealized Gains | 270 |  | 92
Gross Unrealized Losses | 0 |  | 0
Allowance for Credit Losses | 0 |  |
Fair Value | 10,230 |  | 10,046
Obligations of states and political subdivisions |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | 11,688 |  | 11,704
Gross Unrealized Gains | 153 |  | 170
Gross Unrealized Losses | 0 |  | 0
Allowance for Credit Losses | 1 |  |
Fair Value | 11,840 |  | 11,874
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 243,863 |  | 207,269
Gross Unrealized Gains | 10,373 |  | 6,118
Gross Unrealized Losses | (205) |  | (363)
Allowance for Credit Losses | 0 |  |
Fair Value | 254,031 |  | 213,024
Agency mortgage-backed securities |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | 44,720 |  | 46,346
Gross Unrealized Gains | 1,924 |  | 675
Gross Unrealized Losses | 0 |  | 0
Allowance for Credit Losses | 0 |  |
Fair Value | 46,644 |  | 47,021
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 863,698 |  | 888,129
Gross Unrealized Gains | 23,465 |  | 15,083
Gross Unrealized Losses | (496) |  | (1,191)
Allowance for Credit Losses | 0 |  |
Fair Value | 886,667 |  | 902,021
US Treasury Bill Securities [Member] |  |  |
Debt Securities, Available-for-sale [Abstract] |  |  |
Amortized Cost | 9,973 |  | 9,971
Gross Unrealized Gains | 613 |  | 255
Gross Unrealized Losses | 0 |  | 0
Allowance for Credit Losses | 0 |  |
Fair Value | 10,586 |  | 10,226
Corporate Debt Securities [Member] |  |  |
Debt Securities, Held-to-maturity [Abstract] |  |  |
Amortized Cost | 122,827 |  | 123,116
Gross Unrealized Gains | 162 |  | 128
Gross Unrealized Losses | (3,090) |  | (200)
Allowance for Credit Losses | 302 |  |
Fair Value | $ 119,597 |  | $ 123,044

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