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Loans Receivable - Concentrations of Credit (Details)
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Loan
Receivables [Abstract]    
Concentration of loans greater than 10% 0 0
Percentage of concentrations of loans in any industry (in excess of 10%) (percent) 10.00% 10.00%