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Loans Receivable - Allowance for Loan Losses (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Allowance for loan losses and the loans receivable by portfolio segment    
Net deferred loan origination costs $ 1,062 $ 1,069
Loans, net $ 1,306,475 $ 1,323,793