Premises and Equipment (Details) (USD $) In Thousands, unless otherwise specified													12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Land [Member]	Dec. 31, 2011 Land [Member]	Dec. 31, 2012 Building [Member]	Dec. 31, 2011 Building [Member]	Dec. 31, 2012 Equipment [Member]	Dec. 31, 2011 Equipment [Member]	Dec. 31, 2012 Leasehold improvements [Member]	Dec. 31, 2011 Leasehold improvements [Member]	Dec. 31, 2012 Software [Member]	Dec. 31, 2011 Software [Member]	Dec. 31, 2012 Minimum [Member] Building [Member]	Dec. 31, 2012 Minimum [Member] Equipment [Member]	Dec. 31, 2012 Minimum [Member] Leasehold improvements [Member]	Dec. 31, 2012 Minimum [Member] Software [Member]	Dec. 31, 2012 Maximum [Member] Building [Member]	Dec. 31, 2012 Maximum [Member] Equipment [Member]	Dec. 31, 2012 Maximum [Member] Leasehold improvements [Member]	Dec. 31, 2012 Maximum [Member] Software [Member]
Premises and Equipment [Line Items]
Property, Plant and Equipment, Estimated Useful Lives													10	3	1	3	35	15	20	7
Premises and Equipment, gross	$ 464,484	$ 461,569	$ 46,118	$ 46,766	$ 200,578	$ 201,163	$ 125,342	$ 125,440	$ 20,228	$ 22,247	$ 72,218	$ 65,953
Less accumulated depreciation and amortization	283,335	268,620
Premises and Equipment, net	$ 181,149	$ 192,949