Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 securities	Mar. 31, 2013
Investments, Debt and Equity Securities [Abstract]
Number of individual securities that were in a continuous unrealized loss position for less than twelve months	86
Number of individual securities that were in a continuous unrealized loss position for greater than twelve months	35
Available for Sale, Amortized Cost
Amortized Cost - Due in one year or less	$ 2,287
Amortized Cost - Due after one year to five years	31,363
Amortized Cost - Due after five years to ten years	122,156
Amortized Cost - Due after ten years	106,650
Amortized Cost - Total	262,456
Available for Sale, Fair Value
Fair Value - Due in one year or less	2,293
Fair Value - Due after one year to five years	31,641
Fair Value - Due after five years to ten years	121,061
Fair Value - Due after ten years	107,341
Fair Value - Total	262,336
Gross proceeds from sales of securities	$ 43,794	$ 20,492