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Fair Value - Additional Information (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Fair Value Disclosures [Abstract]      
Valuation allowance on real estate owned $ 53 $ 205 $ 162
Valuation allowance on impaired financing receivable $ 1,553 $ 478 $ 496