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Loans Receivable - Performing and Nonaccrual TDR (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Receivables [Abstract]    
Performing TDR loans $ 14,466 $ 22,736
Nonaccrual TDR loans 26,343 6,943
Performing TDR loans, Allowance for loan losses 1,300 2,257
Nonaccrual TDR loans, Allowance for loan losses 218 658
Unfunded commitment to borrowers related to TDR loans $ 736 $ 943