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Trust Preferred Capital Notes (Details) - USD ($)
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jul. 29, 2015
Sep. 20, 2007
Trust Preferred Capital Notes [Line Items]          
Common stock issued $ 8,587,000 $ 8,633,000      
Gain on redemption of trust preferred capital notes $ 0 $ 0 $ 2,424,000    
Trust II [Member]          
Trust Preferred Capital Notes [Line Items]          
Trust preferred securities issued by subsidiary trust       $ 7,000,000 $ 7,000,000
Common stock issued         $ 217,000
Trust preferred securities purchase price par       0.65375  
Trust preferred securities purchase price       $ 4,600,000