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	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 16,434		$ 17,751
60-89 Days Past Due	5,530		6,040
Greater Than 90 Days and Accruing	6,052		4,232
Total Past Due	28,016		28,023
Nonaccrual	48,855		66,736
Current	6,721,019	[1]	6,598,844	[1]
Total, Non-covered loans and leases	6,797,890		6,693,603		6,116,730
Deferred loan fees, net	(10,773)		(12,523)		(12,300)
Total loans and leases	6,787,117		6,681,080
Term & Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	9,817		7,747
60-89 Days Past Due	3,731		2,784
Greater Than 90 Days and Accruing	0		0
Total Past Due	13,548		10,531
Nonaccrual	30,586		43,290
Current	3,886,269	[1]	3,884,622	[1]
Total, Non-covered loans and leases	3,930,403		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	0		0
Greater Than 90 Days and Accruing	0		0
Total Past Due	0		283
Nonaccrual	0		4,177
Current	226,924	[1]	197,658	[1]
Total, Non-covered loans and leases	226,924		202,118
Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	827		479
60-89 Days Past Due	415		0
Greater Than 90 Days and Accruing	0		0
Total Past Due	1,242		479
Nonaccrual	4,845		5,132
Current	60,663	[1]	51,598	[1]
Total, Non-covered loans and leases	66,750		57,209
Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,985		3,009
60-89 Days Past Due	331		746
Greater Than 90 Days and Accruing	19		81
Total Past Due	3,335		3,836
Nonaccrual	12,060		7,040
Current	754,688	[1]	786,926	[1]
Total, Non-covered loans and leases	770,083		797,802
LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	396		1,647
60-89 Days Past Due	49		1,503
Greater Than 90 Days and Accruing	0		0
Total Past Due	445		3,150
Nonaccrual	1,364		7,027
Current	992,850	[1]	913,151	[1]
Total, Non-covered loans and leases	994,659		923,328
Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,075		2,906
60-89 Days Past Due	545		602
Greater Than 90 Days and Accruing	5,116		3,303
Total Past Due	7,736		6,811
Nonaccrual	0		0
Current	501,079	[1]	469,768	[1]
Total, Non-covered loans and leases	508,815		476,579
Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	273		1,398
60-89 Days Past Due	446		214
Greater Than 90 Days and Accruing	794		758
Total Past Due	1,513		2,370
Nonaccrual	0		49
Current	256,727	[1]	258,378	[1]
Total, Non-covered loans and leases	258,240		260,797
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	61		282
60-89 Days Past Due	13		191
Greater Than 90 Days and Accruing	123		90
Total Past Due	197		563
Nonaccrual	0		21
Current	41,819	[1]	36,743	[1]
Total, Non-covered loans and leases	$ 42,016		$ 37,327

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