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Federal Home Loan Bank Advances and Other Borrowings (Details Textual)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
USD ($)
Agreements
Dec. 31, 2016
USD ($)
Agreements
Sep. 30, 2017
USD ($)
Federal Home Loan Bank Advances and Other Borrowings (Textual)      
FHLB advances and other borrowings $ 67,200 $ 115,200  
FHLB advances 60,000 96,000  
Outstanding amount 67,200 115,200  
Securities sold under structured agreements to repurchase 7,200 19,200  
FHLB advances are secured mortgage loans 487,000    
FHLB stock 3,800    
Amount of FHLB advances at fixed rates $ 55,000    
Percentage of FHLB advances at fixed rates 91.70%    
Amount of FHLB advances at floating rates $ 5,000    
Percentage of FHLB advances at floating rates 8.30%    
Structured debt agreements secured by investment securities $ 7,700 $ 21,000  
Number of structured debt agreements | Agreements 2 4  
Interest only line of credit $ 15,000    
Line of credit facility, maturity date Jun. 30, 2020    
Restructured FHLB advances     $ 25,000
Description of present value of cash flow of modified FHLB advances
Present value of the cash flows of the modified advance did not change by more than 10% from the present value of the cash flows of the original advances.
    
Rate 2.53% 3.41%  
FHLB advances weighted average rate 4.39%    
Restructured FHLB advances, weighted average remaining life 8 months    
FHLB advances, weighted average remaining life 22 months    
Restructured FHLB advances, weighted average interest rate 3.36%    
LIBOR [Member]      
Federal Home Loan Bank Advances and Other Borrowings (Textual)      
Line of credit facility, Interest rate description LIBOR plus 2.50    
Floor [Member]      
Federal Home Loan Bank Advances and Other Borrowings (Textual)      
Line of credit, interest rate 2.50%