Investment Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral	$ 248,844	$ 207,088
U.S Government sponsored entities
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions for less than 12 months	4
Collateralized mortgage backed securities
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions for less than 12 months	10
Municipal bonds
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions for less than 12 months	48
Securities in unrealized loss positions for more than 12 months	1
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Securities in unrealized loss positions for less than 12 months	1
Collateralized debt obligations
Schedule of Available-for-sale Securities [Line Items]
Securities representing the majority of unrealized losses in the Investment Portfolio	5