Allowance for Non-Covered Loan Loss and Credit Quality (Non-Covered Non-Accrual Loans And Loans Past Due) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 20,674		$ 17,751
60-89 Days Past Due	19,126		6,040
Greater Than 90 Days and Accruing	5,824		4,232
Total Past Due	45,624		28,023
Nonaccrual	55,234		66,736
Current	6,573,964	[1]	6,598,844	[1]
Total, Non-covered loans and leases	6,674,822		6,693,603		5,952,654
Deferred loan fees, net	(11,636)		(12,523)		(11,400)
Total loans and leases	6,663,186		6,681,080
Term & Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	13,542		7,747
60-89 Days Past Due	3,947		2,784
Greater Than 90 Days and Accruing	238		0
Total Past Due	17,727		10,531
Nonaccrual	35,591		43,290
Current	3,892,200	[1]	3,884,622	[1]
Total, Non-covered loans and leases	3,945,518		3,938,443
Construction & Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0		283
60-89 Days Past Due	917		0
Greater Than 90 Days and Accruing	0		0
Total Past Due	917		283
Nonaccrual	0		4,177
Current	195,746	[1]	197,658	[1]
Total, Non-covered loans and leases	196,663		202,118
Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	0		479
60-89 Days Past Due	605		0
Greater Than 90 Days and Accruing	0		0
Total Past Due	605		479
Nonaccrual	4,964		5,132
Current	52,304	[1]	51,598	[1]
Total, Non-covered loans and leases	57,873		57,209
Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	3,662		3,009
60-89 Days Past Due	12,389		746
Greater Than 90 Days and Accruing	2		81
Total Past Due	16,053		3,836
Nonaccrual	11,623		7,040
Current	756,517	[1]	786,926	[1]
Total, Non-covered loans and leases	784,193		797,802
LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	581		1,647
60-89 Days Past Due	368		1,503
Greater Than 90 Days and Accruing	0		0
Total Past Due	949		3,150
Nonaccrual	3,007		7,027
Current	901,375	[1]	913,151	[1]
Total, Non-covered loans and leases	905,331		923,328
Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	1,939		2,906
60-89 Days Past Due	84		602
Greater Than 90 Days and Accruing	4,493		3,303
Total Past Due	6,516		6,811
Nonaccrual	0		0
Current	480,476	[1]	469,768	[1]
Total, Non-covered loans and leases	486,992		476,579
Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	738		1,398
60-89 Days Past Due	786		214
Greater Than 90 Days and Accruing	992		758
Total Past Due	2,516		2,370
Nonaccrual	49		49
Current	254,797	[1]	258,378	[1]
Total, Non-covered loans and leases	257,362		260,797
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	212		282
60-89 Days Past Due	30		191
Greater Than 90 Days and Accruing	99		90
Total Past Due	341		563
Nonaccrual	0		21
Current	40,549	[1]	36,743	[1]
Total, Non-covered loans and leases	$ 40,890		$ 37,327

[1] Other includes non-covered loans accounted for under ASC 310-30.