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Fair Value - Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis (Details) - Impaired loans - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Assets with fair value adjustments on a nonrecurring basis          
Total impairment losses $ 200 $ 200 $ 700 $ 400  
Fair Value Measurements, Nonrecurring | Level 3          
Assets with fair value adjustments on a nonrecurring basis          
Fair value $ 107   $ 107   $ 1,567