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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,322,998 | $ 1,276,871
Gross Unrealized Gains | 41,915 | 18,620
Gross Unrealized Losses | (5,784) | (4,878)
Allowance for Credit Losses | 0 |
Fair Value | 1,359,129 | 1,290,613
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 7,605 | 498
Gross Unrealized Gains | 67 | 1
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 |
Fair Value | 7,672 | 499
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 2,514 | 2,518
Gross Unrealized Gains | 31 | 16
Gross Unrealized Losses | 0 | (3)
Allowance for Credit Losses | 0 |
Fair Value | 2,545 | 2,531
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 256,974 | 218,362
Gross Unrealized Gains | 6,399 | 5,134
Gross Unrealized Losses | (1,872) | (365)
Allowance for Credit Losses | 0 |
Fair Value | 261,501 | 223,131
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,091 | 12,153
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,487) | (2,167)
Allowance for Credit Losses | 0 |
Fair Value | 8,604 | 9,986
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 56,380 | 55,364
Gross Unrealized Gains | 1,677 | 1,133
Gross Unrealized Losses | (245) | (132)
Allowance for Credit Losses | 0 |
Fair Value | 57,812 | 56,365
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 709,117 | 708,970
Gross Unrealized Gains | 24,296 | 8,951
Gross Unrealized Losses | 0 | (1,816)
Allowance for Credit Losses | 0 |
Fair Value | 733,413 | 716,105
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 32,625 | 30,372
Gross Unrealized Gains | 1,967 | 659
Gross Unrealized Losses | (2) | (24)
Allowance for Credit Losses | 0 |
Fair Value | 34,590 | 31,007
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 159,940 | 172,178
Gross Unrealized Gains | 4,653 | 1,322
Gross Unrealized Losses | 0 | (262)
Allowance for Credit Losses | 0 |
Fair Value | 164,593 | 173,238
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 85,752 | 76,456
Gross Unrealized Gains | 2,825 | 1,404
Gross Unrealized Losses | (178) | (109)
Allowance for Credit Losses | 0 |
Fair Value | $ 88,399 | $ 77,751

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