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Securities Available-for-Sale (Details) - Investments classified by maturity date - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Investment Securities Available-for-Sale: |  |
Due in one year or less, amortized cost | $ 6,817 |
Due in one year or less, fair value | 6,810 |
Due after one year through five years, amortized cost | 33,357 |
Due after one year through five years, fair value | 33,125 |
Due after five years through ten years, amortized cost | 31,599 |
Due after five years through ten years, fair value | 31,918 |
Due after ten years, amortized cost | 145,811 |
Due after ten years, fair value | 142,094 |
Total, amortized cost | 408,282 | $ 436,868
Total, fair value | 400,015 |
Residential mortgage pass-through securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Total, amortized cost | 184,639 | 183,509
Total, fair value | 180,103 |
Commercial mortgage pass-through securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Total, amortized cost | 3,987 | 4,054
Total, fair value | 3,893 |
Other securities [Member] |  |
Investment Securities Available-for-Sale: |  |
Total, amortized cost | 2,072 | $ 3,422
Total, fair value | $ 2,072 |

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