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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, 2017
Dec. 31, 2016
Receivables [Abstract]    
Beginning balance $ 289 $ 582
Accretion of income (108) (185)
Reclassifications from nonaccretable difference 66  
Acquisitions 603  
Disposals   (108)
Ending balance $ 850 $ 289