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Securities - (Details 1) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | $ 740,236 | $ 686,405 |
Gross Unrealized Gains | 5,998 | 3,908 |
Gross Unrealized Losses | (9,228) | (16,065) |
Securities available for sale | 737,006 | 674,248 |
Trust preferred securities |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 21,793 | 23,749 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (4,801) | (5,360) |
Securities available for sale | 16,992 | 18,389 |
Other debt securities |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 22,519 | 22,053 |
Gross Unrealized Gains | 427 | 310 |
Gross Unrealized Losses | (45) | (218) |
Securities available for sale | 22,901 | 22,145 |
Other equity securities |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost |  |  | $ 2,842
Obligations of other U.S. Government agencies and corporations |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 2,053 | 2,066 |
Gross Unrealized Gains | 81 | 92 |
Gross Unrealized Losses | 0 | 0 |
Securities available for sale | 2,134 | 2,158 |
Government agency mortgage backed securities | Residential mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 419,848 | 414,019 |
Gross Unrealized Gains | 3,317 | 1,941 |
Gross Unrealized Losses | (2,288) | (6,643) |
Securities available for sale | 420,877 | 409,317 |
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 50,167 | 50,628 |
Gross Unrealized Gains | 1,032 | 696 |
Gross Unrealized Losses | (146) | (461) |
Securities available for sale | 51,053 | 50,863 |
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 222,110 | 171,362 |
Gross Unrealized Gains | 1,133 | 831 |
Gross Unrealized Losses | (1,948) | (3,367) |
Securities available for sale | 221,295 | 168,826 |
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |  |
Amortized cost and fair value of securities available for sale |  |  |
Amortized Cost | 1,746 | 2,528 |
Gross Unrealized Gains | 8 | 38 |
Gross Unrealized Losses | 0 | (16) |
Securities available for sale | $ 1,754 | $ 2,550 |

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