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Loans - Summary of Past Due and Impaired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Receivables [Abstract]    
Total interest income that would have been recognized under original terms $ 436 $ 534
Total cash received and recognized as interest income on non-accrual loans 62 11
Total interest income recognized on accruing, impaired loans $ 3 $ 11