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Borrowings (Detail Textuals 1) - USD ($)
 1 Months Ended 12 Months Ended
Mar. 17, 2005
Mar. 17, 2004
Dec. 31, 2017
Dec. 31, 2016
Borrowings        
Trust preferred securities issued floating rate Trust Preferred Securities (TPS) to a TPS Pool     $ 712,000  
Investment in preferred interests of the trust by a third party during the period     23,000,000  
Subordinated notes     49,486,000 $ 49,486,000
Investment in common securities of the trust     $ 1,500,000  
Exchange Statutory Trust I        
Borrowings        
Trust preferred securities issued floating rate Trust Preferred Securities (TPS) to a TPS Pool   $ 25,000,000    
Description of variable rate     three-month LIBOR rate  
Basis spread on variable rate (as a percent)     2.70%  
Interest rate at end of period (as a percent)     4.30%  
Exchange Statutory Trust II        
Borrowings        
Trust preferred securities issued floating rate Trust Preferred Securities (TPS) to a TPS Pool $ 23,000,000      
Floating rate Trust Preferred Securities (TPS) to a TPS Pool, term 30 years      
Description of variable rate     three-month LIBOR rate  
Basis spread on variable rate (as a percent)     1.83%  
Interest rate at end of period (as a percent)     3.43%  
Period of time after issuance in which TPS can be repaid without penalty 5 years