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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,263,898 | $ 1,276,871
Gross Unrealized Gains | 45,083 | 18,620
Gross Unrealized Losses | (5,487) | (4,878)
Allowance for Credit Losses | 0 |
Fair Value | 1,303,494 | 1,290,613
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 7,586 | 498
Gross Unrealized Gains | 53 | 1
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 |
Fair Value | 7,639 | 499
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 2,509 | 2,518
Gross Unrealized Gains | 21 | 16
Gross Unrealized Losses | 0 | (3)
Allowance for Credit Losses | 0 |
Fair Value | 2,530 | 2,531
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 263,618 | 218,362
Gross Unrealized Gains | 10,170 | 5,134
Gross Unrealized Losses | (817) | (365)
Allowance for Credit Losses | 0 |
Fair Value | 272,971 | 223,131
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,068 | 12,153
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (4,389) | (2,167)
Allowance for Credit Losses | 0 |
Fair Value | 7,679 | 9,986
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 58,642 | 55,364
Gross Unrealized Gains | 2,440 | 1,133
Gross Unrealized Losses | (212) | (132)
Allowance for Credit Losses | 0 |
Fair Value | 60,870 | 56,365
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 659,279 | 708,970
Gross Unrealized Gains | 24,887 | 8,951
Gross Unrealized Losses | (1) | (1,816)
Allowance for Credit Losses | 0 |
Fair Value | 684,165 | 716,105
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 32,706 | 30,372
Gross Unrealized Gains | 1,712 | 659
Gross Unrealized Losses | (1) | (24)
Allowance for Credit Losses | 0 |
Fair Value | 34,417 | 31,007
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 137,181 | 172,178
Gross Unrealized Gains | 2,366 | 1,322
Gross Unrealized Losses | (27) | (262)
Allowance for Credit Losses | 0 |
Fair Value | 139,520 | 173,238
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 90,309 | 76,456
Gross Unrealized Gains | 3,434 | 1,404
Gross Unrealized Losses | (40) | (109)
Allowance for Credit Losses | 0 |
Fair Value | $ 93,703 | $ 77,751

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