Fair Value Measurements Fair Value Assets and Liabilities Measured On Recurring Basis Reconciliation (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011		Mar. 31, 2012		Dec. 31, 2011		Mar. 31, 2011		Dec. 31, 2010
Loans Held for Sale [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 0	[1]	$ 16,106	[1]	$ 0	[1]	$ 16,106	[1]	$ 0	[1]	$ 15,462	[1]	$ 15,049	[1]	$ 15,136	[1]
Purchases			0	[1]			0	[1]
Issues			0	[1]			0	[1]
Settlements			(60)	[1]	(623)	[1]	(137)	[1]
Transfers out of Level 3					(14,946)	[1]
Gain (Loss) Included in Earnings	0	[1]	1,117	[1]	107	[1]	1,107	[1]
Change in Unrealized Gain (Loss) Included in Other Income	0	[1]	1,117	[1]	107	[1]	1,107	[1]
Clawback Liability [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(46,738)	[2]	(39,628)	[2]	(46,738)	[2]	(39,628)	[2]	(43,694)	[2]	(43,317)	[2]	(39,628)	[2]	(39,311)	[2]
Purchases			0	[2]			0	[2]
Issues			0	[2]			0	[2]
Settlements			0	[2]	0	[2]	0	[2]
Transfers out of Level 3					0	[2]
Gain (Loss) Included in Earnings	(3,044)	[2]	0	[2]	(3,421)	[2]	(317)	[2]
Change in Unrealized Gain (Loss) Included in Other Income	(3,044)	[2]	0	[2]	(3,421)	[2]	(317)	[2]
Freestanding Derivative [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	9,383	[3]	224	[3]	9,383	[3]	224	[3]	8,814	[3]	8,539	[3]	221	[3]	8,949	[3]
Purchases			2,700	[3]			4,075	[3]
Issues			(2,739)	[3]			(4,114)	[3]
Settlements			35	[3]	0	[3]	38	[3]
Transfers out of Level 3					0	[3]
Gain (Loss) Included in Earnings	569	[3]	7	[3]	844	[3]	(8,724)	[3]
Change in Unrealized Gain (Loss) Included in Other Income	569	[3]			844	[3]	(8,439)	[3]
Change in Unrealized Gain (Loss) Included in Other Income			$ 42

[1] (1)Net realized and unrealized gains (losses) on loans held for sale are included in gain on sale of loans.

[2] (2)Changes in fair value of the FDIC clawback liability are recorded in general and administrative expense.

[3] (3)With the exception of changes in the indemnification assets, net realized and unrealized gains (losses) on freestanding derivatives are included in other noninterest income. Changes in the fair value of the indemnification assets are recorded in general and administrative expense.