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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | $ 297,469 | $ 314,002
Commitments to extend credit |  |
Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | 233,920 | 238,527
Commitments to originate residential first and second mortgage loans |  |
Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | 2,217 | 1,471
Standby letters of credit |  |
Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | $ 61,332 | $ 74,004

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