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Loans Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross $ 96,064   $ 96,064   $ 106,798
Loans receivable 97,566   97,566   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
Increase (decrease) in valuation allowance 0 $ 93 (14) $ 661  
Loans in nonaccrual status 4,500   4,500   5,400
Real estate loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross 82,938   82,938   92,415
Loans receivable 82,938   82,938   92,415
Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross 13,126   13,126   14,383
Loans receivable $ 14,628   $ 14,628   $ 15,884