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Securities, Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-sale, amortized cost [Abstract] |  |
Due in one year or less | $ 69,861 |
Due after one through five years | 162,304 |
Due after five through ten years | 51,203 |
Due after ten years | 82,849 |
U.S. government sponsored agency mortgage-backed securities | 219,961 |
Amortized cost | 586,178 | $ 583,939
CRA investment funds | 25,000 |
Amortized cost | 611,178 | 608,939
Available-for-sale, fair value [Abstract] |  |
Due in one year or less | 69,819 |
Due after one through five years | 163,221 |
Due after five through ten years | 52,067 |
Due after ten years | 82,893 |
U.S. government sponsored agency mortgage-backed securities | 217,872 |
Total debt securities | 585,872 | 581,036
CRA investment funds | 24,496 |
Total securities | 610,368 | 605,394
Held-to-maturity, amortized cost [Abstract] |  |
Due in one year or less | 0 |
Due after one through five years | 858 |
Due after five through ten years | 0 |
Due after ten years | 0 |
U.S. government sponsored agency mortgage-backed securities | 0 |
Amortized cost | 858 | 866
CRA investment funds | 0 |
Total securities | 858 |
Held-to-maturity, fair value [Abstract] |  |
Due in one year or less | 0 |
Due after one through five years | 858 |
Due after five through ten years | 0 |
Due after ten years | 0 |
U.S. government sponsored agency mortgage-backed securities | 0 |
Total debt securities | 858 | $ 867
CRA investment funds | 0 |
Total securities | $ 858 |

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