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Securities Available-for-Sale (Details) - Investments classified by maturity date - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Securities Available-for-Sale: |  |
Due in one year or less, amortized cost | $ 4,429 |
Due in one year or less, fair value | 4,425 |
Due after one year through five years, amortized cost | 36,607 |
Due after one year through five years, fair value | 36,375 |
Due after five years through ten years, amortized cost | 28,135 |
Due after five years through ten years, fair value | 28,290 |
Due after ten years, amortized cost | 150,398 |
Due after ten years, fair value | 145,580 |
Total, amortized cost | 421,147 | $ 436,868
Total, fair value | 410,039 |
Residential mortgage pass-through securities [Member] |  |
Securities Available-for-Sale: |  |
Total, amortized cost | 196,650 | 183,509
Total, fair value | 190,551 |
Commercial mortgage pass-through securities [Member] |  |
Securities Available-for-Sale: |  |
Total, amortized cost | 3,953 | 4,054
Total, fair value | 3,843 |
Other securities [Member] |  |
Securities Available-for-Sale: |  |
Total, amortized cost | 975 | $ 3,422
Total, fair value | $ 975 |

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