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Fair Value - Assets and Liabilities Recorded at Fair Value on a Nonrecurring Basis (Details) - Impaired loans - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Assets with fair value adjustments on a nonrecurring basis      
Total impairment losses $ 200 $ 100  
Fair Value, Measurements, Nonrecurring | Level 3      
Assets with fair value adjustments on a nonrecurring basis      
Fair value     $ 1,250