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Loans Receivable - SBA Loans (Details) - SBA Loans - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
SBA Loans [Line Items]      
SBA loans serviced for others with participating interest, gross loan balance $ 54,335 $ 53,809  
SBA loans serviced for others with participating interest, participation balance owned by Bank 12,715 12,394  
Servicing fee income and fees from SBA loans serviced for others $ 506 $ 467 $ 460