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	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	$ 13,094		$ 17,751
60-89 Days Past Due	8,966		6,040
Greater Than 90 Days and Accruing	4,936		4,232
Total Past Due	26,996		28,023
Nonaccrual	39,805		66,736
Current	7,168,314	[1]	6,598,844	[1]
Total, Non-covered loans and leases	7,235,115		6,693,603		6,260,525
Deferred loan fees, net	(6,211)		(12,523)		(12,100)
Total loans and leases	7,228,904		6,681,080
Term & Multifamily [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	6,349		7,747
60-89 Days Past Due	3,389		2,784
Greater Than 90 Days and Accruing	1,402		0
Total Past Due	11,140		10,531
Nonaccrual	18,529		43,290
Current	3,976,314	[1]	3,884,622	[1]
Total, Non-covered loans and leases	4,005,983		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	5,130		4,177
Current	242,679	[1]	197,658	[1]
Total, Non-covered loans and leases	247,809		202,118
Residential Development [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	768		479
60-89 Days Past Due	605		0
Greater Than 90 Days and Accruing	0		0
Total Past Due	1,373		479
Nonaccrual	2,871		5,132
Current	74,754	[1]	51,598	[1]
Total, Non-covered loans and leases	78,998		57,209
Term [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,760		3,009
60-89 Days Past Due	238		746
Greater Than 90 Days and Accruing	0		81
Total Past Due	2,998		3,836
Nonaccrual	10,534		7,040
Current	755,641	[1]	786,926	[1]
Total, Non-covered loans and leases	769,173		797,802
LOC & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	2,110		1,647
60-89 Days Past Due	3,330		1,503
Greater Than 90 Days and Accruing	470		0
Total Past Due	5,910		3,150
Nonaccrual	2,741		7,027
Current	1,274,478	[1]	913,151	[1]
Total, Non-covered loans and leases	1,283,129		923,328
Mortgage [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	562		2,906
60-89 Days Past Due	898		602
Greater Than 90 Days and Accruing	2,690		3,303
Total Past Due	4,150		6,811
Nonaccrual	0		0
Current	546,050	[1]	469,768	[1]
Total, Non-covered loans and leases	550,200		476,579
Home Equity Loans & Lines [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	492		1,398
60-89 Days Past Due	453		214
Greater Than 90 Days and Accruing	346		758
Total Past Due	1,291		2,370
Nonaccrual	0		49
Current	254,911	[1]	258,378	[1]
Total, Non-covered loans and leases	256,202		260,797
Consumer & Other [Member]
Financing Receivable, Recorded Investment, Past Due [Line Items]
30-59 Days Past Due	53		282
60-89 Days Past Due	53		191
Greater Than 90 Days and Accruing	28		90
Total Past Due	134		563
Nonaccrual	0		21
Current	43,487	[1]	36,743	[1]
Total, Non-covered loans and leases	$ 43,621		$ 37,327

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