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Investment Securities, Maturities (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Available-for-Sale, Amortized Cost |  |
Due within one year | $ 11,856 |
Due from one to five years | 117,046 |
Due from five to ten years | 121,065 |
Due after ten years | 7,549 |
Available-for-sale, amortized cost | 257,516 |
Available-for-sale, amortized cost | 329,895 | $ 324,662
Available-for-Sale, Fair Value |  |
Due within one year | 11,925 |
Due from one to five years | 117,557 |
Due from five to ten years | 118,832 |
Due after ten years | 7,153 |
Available-for-sale, fair value | 255,467 |
Available-for-sale, at fair value | 326,676 | 320,659
Held-to-Maturity, Amortized Cost |  |
Due within one year | 6,035 |
Due from one to five years | 4,108 |
Due from five to ten years | 10,365 |
Due after ten years | 17,947 |
Amortized Cost | 38,455 | 41,003
Held-to-Maturity, Fair Value |  |
Due within one year | 6,043 |
Due from one to five years | 4,070 |
Due from five to ten years | 10,142 |
Due after ten years | 17,757 |
Held-to-maturity, fair value | 38,012 | 40,490
Available-for-sale securities pledged as collateral | 185,788 | 149,990
U.S. Agency mortgage-backed securities [Member] |  |
Available-for-Sale, Amortized Cost |  |
Available-for-sale, amortized cost | 69,162 | 72,402
Available-for-Sale, Fair Value |  |
Available-for-sale, at fair value | 67,968 | 71,047
Held-to-Maturity, Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity, Fair Value |  |
Held-to-maturity, fair value | 0 |
Mutual funds [Member] |  |
Available-for-Sale, Amortized Cost |  |
Available-for-sale, amortized cost | 2,536 | 2,527
Available-for-Sale, Fair Value |  |
Available-for-sale, at fair value | 2,491 | 2,482
Held-to-Maturity, Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity, Fair Value |  |
Held-to-maturity, fair value | 0 |
Trust preferred securities [Member] |  |
Available-for-Sale, Amortized Cost |  |
Available-for-sale, amortized cost | 49 | 49
Available-for-Sale, Fair Value |  |
Available-for-sale, at fair value | 49 | 48
Held-to-Maturity, Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity, Fair Value |  |
Held-to-maturity, fair value | 0 |
Equity securities [Member] |  |
Available-for-Sale, Amortized Cost |  |
Available-for-sale, amortized cost | 632 | 632
Available-for-Sale, Fair Value |  |
Available-for-sale, at fair value | 701 | $ 677
Held-to-Maturity, Amortized Cost |  |
Amortized Cost | 0 |
Held-to-Maturity, Fair Value |  |
Held-to-maturity, fair value | $ 0 |

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