Derivative Financial Instruments Part 2 (Details) (USD $) In Thousands			3 Months Ended		9 Months Ended														3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended
	Sep. 30, 2011 Designated as Hedging Instrument [Member] Forward Contracts [Member] Other Liabilities [Member]	Dec. 31, 2010 Designated as Hedging Instrument [Member] Forward Contracts [Member] Other Liabilities [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2010 Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2011 Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2010 Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Future [Member] Other Assets [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Future [Member] Other Assets [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Other Assets [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Other Assets [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Other Liabilities [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Interest Rate Swap [Member] Other Liabilities [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Exchange Traded Purchased Options [Member] Other Assets [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Exchange Traded Purchased Options [Member] Other Assets [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] OTC Written Options [Member] Other Assets [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] OTC Written Options [Member] Other Assets [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Exchange Traded Written Options [Member] Other Liabilities [Member]	Dec. 31, 2010 Not Designated as Hedging Instrument [Member] Exchange Traded Written Options [Member] Other Liabilities [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2010 Not Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2010 Not Designated as Hedging Instrument [Member] Mortgage Banking, Net [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Bankcard and Other Fees [Member]	Sep. 30, 2010 Not Designated as Hedging Instrument [Member] Bankcard and Other Fees [Member]	Sep. 30, 2011 Not Designated as Hedging Instrument [Member] Bankcard and Other Fees [Member]	Sep. 30, 2010 Not Designated as Hedging Instrument [Member] Bankcard and Other Fees [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative asset							$ 246	$ (2,897)	$ 1,073	$ 0			$ 213	$ 313	$ 1,529	$ 337
Fair value of derivative liability	3,702	(3,143)									1,111	0					658	1,562
Derivative Instruments, Gain (Loss) [Line Items]
Amount of gain (loss) recognized			$ (3,570)	$ 2,077	$ (6,845)	$ (3,380)													$ 12,092	$ 5,986	$ 18,246	$ 23,778	$ (23)	$ 0	$ (38)	$ 0