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Securities - (Details 1) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | $ 704,305 | $ 686,405 |
Gross Unrealized Gains | 4,810 | 3,908 |
Gross Unrealized Losses | (12,230) | (16,065) |
Securities available for sale | 696,885 | 674,248 |
Trust preferred securities |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 22,646 | 23,749 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (4,823) | (5,360) |
Securities available for sale | 17,823 | 18,389 |
Other debt securities |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 22,442 | 22,053 |
Gross Unrealized Gains | 354 | 310 |
Gross Unrealized Losses | (140) | (218) |
Securities available for sale | 22,656 | 22,145 |
Other equity securities |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost |  |  | $ 75
Obligations of other U.S. Government agencies and corporations |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 2,060 | 2,066 |
Gross Unrealized Gains | 89 | 92 |
Gross Unrealized Losses | 0 | 0 |
Securities available for sale | 2,149 | 2,158 |
Government agency mortgage backed securities | Residential mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 412,710 | 414,019 |
Gross Unrealized Gains | 2,710 | 1,941 |
Gross Unrealized Losses | (4,165) | (6,643) |
Securities available for sale | 411,255 | 409,317 |
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 50,397 | 50,628 |
Gross Unrealized Gains | 777 | 696 |
Gross Unrealized Losses | (302) | (461) |
Securities available for sale | 50,872 | 50,863 |
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 192,294 | 171,362 |
Gross Unrealized Gains | 879 | 831 |
Gross Unrealized Losses | (2,787) | (3,367) |
Securities available for sale | 190,386 | 168,826 |
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 1,756 | 2,528 |
Gross Unrealized Gains | 1 | 38 |
Gross Unrealized Losses | (13) | (16) |
Securities available for sale | $ 1,744 | $ 2,550 |

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