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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Available-for-sale, amortized cost [Abstract] |  |
Due in one year or less | $ 68,479 |
Due after one through five years | 154,511 |
Due after five through ten years | 63,044 |
Due after ten years | 86,590 |
U.S. government sponsored agency mortgage-backed securities | 226,794 |
Amortized cost | 599,418 | $ 568,381
CRA investment funds | 25,000 |
Amortized cost | 624,418 | 593,381
Available-for-sale, fair value [Abstract] |  |
Due in one year or less | 68,576 |
Due after one through five years | 156,366 |
Due after five through ten years | 65,336 |
Due after ten years | 88,008 |
U.S. government sponsored agency mortgage-backed securities | 227,771 |
Total debt securities | 606,057 | 570,185
CRA investment funds | 25,144 |
Total securities | 631,201 | 594,936
Held-to-maturity, amortized cost [Abstract] |  |
Due in one year or less | 0 |
Due after one through five years | 1,181 |
Due after five through ten years | 0 |
Due after ten years | 0 |
U.S. government sponsored agency mortgage-backed securities | 0 |
Amortized cost | 1,181 | 1,661
CRA investment funds | 0 |
Total securities | 1,181 |
Held-to-maturity, fair value [Abstract] |  |
Due in one year or less | 0 |
Due after one through five years | 1,182 |
Due after five through ten years | 0 |
Due after ten years | 0 |
U.S. government sponsored agency mortgage-backed securities | 0 |
Total debt securities | 1,182 | $ 1,651
CRA investment funds | 0 |
Total securities | $ 1,182 |

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