Investment Securities (Other Investments Table) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2012
Other investments
FRB stock	$ 52,477	$ 21,045	$ 21,045
FHLB stock	214,586	119,145	119,145
Other	502	527	552
Total other investments	$ 267,565	$ 140,717	$ 140,742