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Loans - Accretable Yield or Income Expected to be Collected on Purchased Credit Impaired Loans (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Beginning balance $ 767 $ 850
Accretion of income (169) (1,509)
Reclassification from nonaccretable difference 10  
Acquisition   1,887
Disposals (54) (461)
Ending balance $ 554 $ 767