Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 security	Mar. 31, 2014
Investments, Debt and Equity Securities [Abstract]
Number of individual securities that were in a continuous unrealized loss position for less than twelve months	29
Number of individual securities that were in a continuous unrealized loss position for greater than twelve months	15
Amortized Cost
Amortized Cost - Due in one year or less	$ 4,220
Amortized Cost - Due after one year to five years	40,569
Amortized Cost - Due after five years to ten years	96,622
Amortized Cost - Due after ten years	65,699
Amortized Cost - Total	207,110
Fair Value
Fair Value - Due in one year or less	4,241
Fair Value - Due after one year to five years	41,108
Fair Value - Due after five years to ten years	97,529
Fair Value - Due after ten years	68,473
Fair Value - Total	211,351
Gross proceeds from sales of securities	$ 15,807	$ 43,794