Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Securities in Continuous Unrealized Loss Position Less Than 12 Months, Number of Securities		2
Securities in Continuous Unrealized Loss Position Less Than 12 Months, Market Value		$ 4,244
Securities in Continuous Unrealized Loss Position Less Than 12 Months, Unrealized Loss		(9)
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Number of Securities	6	3
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Market Value	7,510	1,900
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Unrealized Loss	(504)	(853)
Mortgage-Backed Securities, Issued By Us Government Sponsored Enterprises [Member]
Securities in Continuous Unrealized Loss Position Less Than 12 Months, Number of Securities		2
Securities in Continuous Unrealized Loss Position Less Than 12 Months, Market Value		4,244
Securities in Continuous Unrealized Loss Position Less Than 12 Months, Unrealized Loss		(9)
Mortgage-Backed Securities, Issued By Private Enterprises [Member]
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Number of Securities	1	1
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Market Value	294	256
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Unrealized Loss	(20)	(97)
Auction-Rate Trust Preferred Securities [Member]
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Number of Securities	5	2
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Market Value	7,216	1,644
Securities in Continuous Unrealized Loss Position 12 or More Consecutive Months, Unrealized Loss	$ (484)	$ (756)