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Loans Receivable - TDR Loans, Recorded Investment and Allowance (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Performing TDRs, TDR loans $ 24,449 $ 26,757
Nonaccrual TDRs, TDR loans 6,461 5,193
Performing TDRs, Allowance for loan losses on TDR loans 2,237 2,635
Nonaccrual TDRs, Allowance for loan losses on TDR loans 713 379
Unfunded commitments related to credits classified as TDRs $ 1,300 $ 1,200