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Securities (Details 3) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | ---
Held-to-maturity Securities, Amortized Cost Basis [Abstract] |  |  |
Due within one year | $ 11,419 |  |
Due after one year through five years | 110,979 |  |
Due after five years through ten years | 129,883 |  |
Due after ten years | 104,001 |  |
Held-to-maturity Securities, Fair Value [Abstract] |  |  |
Due within one year | 11,504 |  |
Due after one year through five years | 114,123 |  |
Due after five years through ten years | 131,145 |  |
Due after ten years | 106,121 |  |
Available-for-sale Securities, Amortized Cost Basis [Abstract] |  |  |
Due within one year | 0 |  |
Due after one year through five years | 2,066 |  |
Due after five years through ten years | 1,047 |  |
Due after ten years | 23,749 |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Due within one year | 0 |  |
Due after one year through five years | 2,158 |  |
Due after five years through ten years | 1,039 |  |
Due after ten years | 18,389 |  |
Held to maturity, amortized cost | 356,282 | $ 458,400 |
Held to maturity, fair value | 362,893 | 473,753 |
Amortized Cost | 686,405 | 1,117 | $ 724
Securities available for sale, at fair value | 674,248 | 646,805 |
Other debt securities |  |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Held to maturity, amortized cost | 0 |  |
Held to maturity, fair value | 0 |  |
Amortized Cost | 21,006 |  |
Securities available for sale, at fair value | 21,106 |  |
Other equity securities |  |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Held to maturity, amortized cost | 0 |  |
Held to maturity, fair value | 0 |  |
Amortized Cost | 0 |  |
Securities available for sale, at fair value | 0 | 4,340 |
Government agency mortgage backed securities | Residential mortgage backed securities: |  |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Held to maturity, amortized cost | 0 |  |
Held to maturity, fair value | 0 |  |
Amortized Cost | 414,019 |  |
Securities available for sale, at fair value | 409,317 | 364,540 |
Government agency mortgage backed securities | Commercial mortgage backed securities: |  |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Held to maturity, amortized cost | 0 |  |
Held to maturity, fair value | 0 |  |
Amortized Cost | 50,628 |  |
Securities available for sale, at fair value | 50,863 | 59,759 |
Government agency collateralized mortgage obligations | Residential mortgage backed securities: |  |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Held to maturity, amortized cost | 0 |  |
Held to maturity, fair value | 0 |  |
Amortized Cost | 171,362 |  |
Securities available for sale, at fair value | 168,826 | 168,060 |
Government agency collateralized mortgage obligations | Commercial mortgage backed securities: |  |  |
Available-for-sale Securities, Fair Value [Abstract] |  |  |
Held to maturity, amortized cost | 0 |  |
Held to maturity, fair value | 0 |  |
Amortized Cost | 2,528 |  |
Securities available for sale, at fair value | $ 2,550 | $ 5,104 |

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