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Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Off-Balance-Sheet Financial instruments | At December 31, 2017 and 2016, the Bank had the following off-balance-sheet financial instruments, whose contract amounts represent credit risk:
As of December 31, | 2017 |  | 2016
Unused lines, collateralized by residential real estate | $ | 76,887,000 |  |  | $ | 76,646,000 |
Other unused commitments | 62,771,000 |  |  | 57,738,000 |
Standby letters of credit | 3,497,000 |  |  | 4,198,000 |
Commitments to extend credit | 8,724,000 |  |  | 10,684,000 |
Total | $ | 151,879,000 |  |  | $ | 149,266,000 |

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