Investment Securities (Details) (Textual) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
security
Dec. 31, 2012
Dec. 31, 2014
security
Investments, Debt and Equity Securities [Abstract]      
Number of available-for-sale securities in unrealized loss positions 19   3
Number of held-to-maturity securities in an unrealized loss position 0   0
Available-for-sale securities, realized gain $ 189 $ 355  
Available-for-sale securities, realized loss $ 0 $ 48