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Concentration in Deposits (Details Textual) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Concentration Risk [Line Items]    
Deposits $ 1,438,582,719 $ 907,065,171
Customer Concentration Risk [Member]    
Concentration Risk [Line Items]    
Deposits $ 116,121,000 $ 60,153,000