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Loans, net and allowance for loan losses - Net Deferred Loan Costs (Details) - USD ($)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Loans, net and allowance for loan losses        
Net deferred loan costs $ 744,000 $ 575,000    
Loans outstanding to directors, executive officers, principal stockholders or to their affiliates 14,701,000 15,169,000    
Advances and repayments of loans receivable 1,657,000 1,947,000    
Number of related party loans classified as nonaccrual, past due, or restructured 0 0    
Deposits from related parties 16,200,000 10,000,000    
Interest income recognized using the cash-basis method on impaired loans $ 0 $ 0 $ 0 $ 0