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FHLB Advances, Other Borrowings and Junior Subordinated Notes Trust II Issuance Of Trust Preferred Securities (Details) - USD ($)
Dec. 31, 2017
Dec. 31, 2016
Sep. 26, 2008
Variable Interest Entity [Line Items]      
Trust preferred securities $ 10,019,000 $ 10,004,000  
Sole ownership of common securities issued by Trust II 315,000    
Junior subordinated notes 10,019,000 $ 10,004,000  
Unamortized Debt Issuance Expense $ 296,000    
Trust II      
Variable Interest Entity [Line Items]      
Trust preferred securities     $ 10,000,000
Trust preferred securities fixed rate     10.50%
Sole ownership of common securities issued by Trust II     $ 315,000
Junior subordinated notes      
Variable Interest Entity [Line Items]      
Trust preferred securities fixed rate 10.50%    
Junior subordinated notes $ 10,315,000