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Commitments and Contingencies (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | $ 244,140 | $ 258,746
Commitments to extend credit |  |
Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | 212,420 | 253,375
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 | 2,597 | 2,626
Standby letters of credit |  |
Contractual amount of off-balance-sheet financial instruments |  |
Total contractual amount of off-balance-sheet financial instruments | $ 29,123 | $ 2,745

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