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Loans Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross $ 74,229   $ 74,229   $ 106,798
Loans receivable 76,615   76,615   108,299
Valuation allowance, specific 1,200   1,200   1,200
Valuation allowance, general 2,183   2,183   2,197
Valuation allowance of loans receivable 3,383   3,383   3,397
(Decrease) increase in valuation allowance 0 $ 467 (14) $ 1,128  
Loans in nonaccrual status 4,500   4,500   5,400
Real estate loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross 59,487   59,487   92,415
Loans receivable 60,372   60,372   92,415
Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross 14,742   14,742   14,383
Loans receivable $ 16,243   $ 16,243   $ 15,884