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Loans Receivable (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross $ 96,590   $ 96,590   $ 79,684
Loans receivable 98,878   98,878   82,047
Valuation allowance, specific 1,200   1,200   1,200
Valuation allowance, general 2,183   2,183   2,183
Valuation allowance of loans receivable 3,383   3,383   3,383
Decrease in valuation allowance 0 $ 0 0 $ (14)  
Loans in nonaccrual status 1,500   1,500   4,300
Real estate loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross 62,775   62,775   66,057
Loans receivable 63,561   63,561   66,917
Commercial loans          
Accounts, Notes, Loans and Financing Receivable [Line Items]          
Loans receivable, gross 33,815   33,815   13,627
Loans receivable $ 35,317   $ 35,317   $ 15,130