Investment Securities (Other Investments Table) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2012
Other investments
FRB stock	$ 21,324	$ 21,045	$ 21,003
FHLB stock	119,145	119,145	119,145
Other	515	527	565
Total other investments	$ 140,984	$ 140,717	$ 140,713