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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,253,273 | $ 1,276,871
Gross Unrealized Gains | 44,618 | 18,620
Gross Unrealized Losses | (4,503) | (4,878)
Allowance for Credit Losses | 0 |
Fair Value | 1,293,388 | 1,290,613
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 7,067 | 498
Gross Unrealized Gains | 45 | 1
Gross Unrealized Losses | 0 | 0
Allowance for Credit Losses | 0 |
Fair Value | 7,112 | 499
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 1,505 | 2,518
Gross Unrealized Gains | 10 | 16
Gross Unrealized Losses | 0 | (3)
Allowance for Credit Losses | 0 |
Fair Value | 1,515 | 2,531
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 267,067 | 218,362
Gross Unrealized Gains | 11,224 | 5,134
Gross Unrealized Losses | (651) | (365)
Allowance for Credit Losses | 0 |
Fair Value | 277,640 | 223,131
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,042 | 12,153
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (3,550) | (2,167)
Allowance for Credit Losses | 0 |
Fair Value | 8,492 | 9,986
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 62,495 | 55,364
Gross Unrealized Gains | 2,935 | 1,133
Gross Unrealized Losses | (131) | (132)
Allowance for Credit Losses | 0 |
Fair Value | 65,299 | 56,365
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 649,383 | 708,970
Gross Unrealized Gains | 23,601 | 8,951
Gross Unrealized Losses | (64) | (1,816)
Allowance for Credit Losses | 0 |
Fair Value | 672,920 | 716,105
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 29,198 | 30,372
Gross Unrealized Gains | 1,316 | 659
Gross Unrealized Losses | (1) | (24)
Allowance for Credit Losses | 0 |
Fair Value | 30,513 | 31,007
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 133,993 | 172,178
Gross Unrealized Gains | 2,181 | 1,322
Gross Unrealized Losses | (29) | (262)
Allowance for Credit Losses | 0 |
Fair Value | 136,145 | 173,238
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 90,523 | 76,456
Gross Unrealized Gains | 3,306 | 1,404
Gross Unrealized Losses | (77) | (109)
Allowance for Credit Losses | 0 |
Fair Value | $ 93,752 | $ 77,751

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