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Loans - Accretable Yield or Income Expected to be Collected on Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]    
Beginning balance $ 582 $ 130
Accretion of income (185) (529)
Reclassifications from nonaccretable difference   176
Acquisitions   805
Disposals (108)  
Ending balance $ 289 $ 582