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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,222,123 | $ 1,264,529
Gross Unrealized Gains | 20,591 | 4,517
Gross Unrealized Losses | (4,137) | (18,269)
Fair Value | 1,238,577 | 1,250,777
U.S. Treasury securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 498 |
Gross Unrealized Gains | 0 |
Gross Unrealized Losses | 0 |
Fair Value | 498 |
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 2,523 | 2,536
Gross Unrealized Gains | 18 | 13
Gross Unrealized Losses | (4) | (38)
Fair Value | 2,537 | 2,511
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 211,559 | 200,798
Gross Unrealized Gains | 5,585 | 3,038
Gross Unrealized Losses | (156) | (567)
Fair Value | 216,988 | 203,269
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,160 | 12,359
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (2,298) | (1,726)
Fair Value | 9,862 | 10,633
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 46,739 | 44,046
Gross Unrealized Gains | 1,513 | 192
Gross Unrealized Losses | (3) | (311)
Fair Value | 48,249 | 43,927
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 658,830 | 621,690
Gross Unrealized Gains | 8,723 | 719
Gross Unrealized Losses | (1,386) | (9,126)
Fair Value | 666,167 | 613,283
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 26,794 | 21,957
Gross Unrealized Gains | 874 | 257
Gross Unrealized Losses | (2) | (384)
Fair Value | 27,666 | 21,830
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 189,332 | 332,697
Gross Unrealized Gains | 2,123 | 274
Gross Unrealized Losses | (268) | (5,982)
Fair Value | 191,187 | 326,989
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 73,688 | 28,446
Gross Unrealized Gains | 1,755 | 24
Gross Unrealized Losses | (20) | (135)
Fair Value | $ 75,423 | $ 28,335

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