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Securities - Amortized Cost and Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Amortized cost and fair value of securities available for sale |  |
Amortized Cost | $ 1,254,258 | $ 1,264,529
Gross Unrealized Gains | 18,463 | 4,517
Gross Unrealized Losses | (4,441) | (18,269)
Fair Value | 1,268,280 | 1,250,777
Obligations of other U.S. Government agencies and corporations |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 2,527 | 2,536
Gross Unrealized Gains | 20 | 13
Gross Unrealized Losses | (8) | (38)
Fair Value | 2,539 | 2,511
Obligations of states and political subdivisions |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 169,123 | 200,798
Gross Unrealized Gains | 4,891 | 3,038
Gross Unrealized Losses | (17) | (567)
Fair Value | 173,997 | 203,269
Trust preferred securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 12,245 | 12,359
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | (1,859) | (1,726)
Fair Value | 10,386 | 10,633
Other debt securities |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 47,651 | 44,046
Gross Unrealized Gains | 1,440 | 192
Gross Unrealized Losses | (11) | (311)
Fair Value | 49,080 | 43,927
Government agency mortgage backed securities | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 600,257 | 621,690
Gross Unrealized Gains | 7,694 | 719
Gross Unrealized Losses | (1,498) | (9,126)
Fair Value | 606,453 | 613,283
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 31,795 | 21,957
Gross Unrealized Gains | 812 | 257
Gross Unrealized Losses | (62) | (384)
Fair Value | 32,545 | 21,830
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 319,896 | 332,697
Gross Unrealized Gains | 2,301 | 274
Gross Unrealized Losses | (986) | (5,982)
Fair Value | 321,211 | 326,989
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |
Amortized cost and fair value of securities available for sale |  |
Amortized Cost | 70,764 | 28,446
Gross Unrealized Gains | 1,305 | 24
Gross Unrealized Losses | 0 | (135)
Fair Value | $ 72,069 | $ 28,335

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