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Loans - Accretable Yield or Income Expected to be Collected on Purchased Credit Impaired Loans and Related Changes (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Receivables [Abstract]    
Beginning balance $ 582 $ 130
Accretion of income (121) (529)
Reclassifications from nonaccretable difference   176
Acquisition   805
Disposals (77)  
Ending balance $ 384 $ 582