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Federal Home Loan Bank Advances (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Bank Advances (Textual)    
Secured by mortgage loans $ 112,700  
Advances from Federal Home Loan Banks $ 18,500 $ 26,500
Minimum [Member]    
Federal Home Loan Bank Advances (Textual)    
Interest rate 1.48%  
Maximum [Member]    
Federal Home Loan Bank Advances (Textual)    
Interest rate 1.96%