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Subsequent Event (Details)
 12 Months Ended
Jan. 20, 2016
USD ($)
security
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Subsequent Event [Line Items]        
Held-to-maturity securities   $ 31,712,000 $ 31,964,000  
Gross realized gains from calls   $ 14,000 $ 0 $ 0
Subsequent Event [Member]        
Subsequent Event [Line Items]        
Investment securities $ 23,000,000      
Number of held-to-maturity securities sold | security 5      
Number of investment securities sold | security 13      
Held-to-maturity securities $ 8,000,000      
Gross realized gains from calls $ 648,000