Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Allowance for Noncovered Loan and Lease Losses) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Allowance for Loan and Lease Losses [Roll Forward]
Provision (recapture) for loan and lease losses	$ 5,752	$ 47,346	$ 63,500
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	60,993	53,478	42,747
Charge-offs	(20,931)	(39,403)	(54,521)
Recoveries	5,579	5,627	1,752
Provision (recapture) for loan and lease losses	7,400	41,291	63,500
Net chargeoffs			(52,769)
Balance at the end of year	53,041	60,993	53,478
Specific Reserve	1,484	974
General Allocation	51,557	60,019
Commercial Portfolio Segment [Member] | Secured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	21,811	20,409
Charge-offs	(7,270)	(12,779)
Recoveries	1,154	1,218
Provision (recapture) for loan and lease losses	9,050	12,963
Balance at the end of year	24,745	21,811
Specific Reserve	954	600
General Allocation	23,791	21,211
Commercial Portfolio Segment [Member] | Unsecured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	738	1,560
Charge-offs	(639)	(2,100)
Recoveries	1,444	1,171
Provision (recapture) for loan and lease losses	(854)	107
Balance at the end of year	689	738
Specific Reserve	97	75
General Allocation	592	663
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	1,100	1,072
Charge-offs	(717)	(406)
Recoveries	80	15
Provision (recapture) for loan and lease losses	191	419
Balance at the end of year	654	1,100
Specific Reserve	96	0
General Allocation	558	1,100
Real Estate Portfolio Segment [Member] | Commercial Land [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	634	664
Charge-offs	(660)	(2,165)
Recoveries	12	0
Provision (recapture) for loan and lease losses	502	2,135
Balance at the end of year	488	634
Specific Reserve	0	0
General Allocation	488	634
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	15,210	9,860
Charge-offs	(1,407)	(1,969)
Recoveries	414	124
Provision (recapture) for loan and lease losses	(4,666)	7,195
Balance at the end of year	9,551	15,210
Specific Reserve	63	59
General Allocation	9,488	15,151
Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	9,692	6,690
Charge-offs	(1,620)	(2,039)
Recoveries	33	2
Provision (recapture) for loan and lease losses	1,501	5,039
Balance at the end of year	9,606	9,692
Specific Reserve	185	0
General Allocation	9,421	9,692
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	274	2,453
Charge-offs	(2,213)	(3,107)
Recoveries	0	775
Provision (recapture) for loan and lease losses	2,604	153
Balance at the end of year	665	274
Specific Reserve	0	175
General Allocation	665	99
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	70	36
Charge-offs	0	0
Recoveries	0	0
Provision (recapture) for loan and lease losses	(35)	34
Balance at the end of year	35	70
Specific Reserve	0	0
General Allocation	35	70
Real Estate Construction Portfolio Segment [Member] | Land And Acquisition [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	3,769	5,711
Charge-offs	(1,419)	(8,409)
Recoveries	1,978	1,199
Provision (recapture) for loan and lease losses	(1,997)	5,268
Balance at the end of year	2,331	3,769
Specific Reserve	0	3
General Allocation	2,331	3,766
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	2,292	2,304
Charge-offs	(1,068)	(2,447)
Recoveries	113	474
Provision (recapture) for loan and lease losses	(473)	1,961
Balance at the end of year	864	2,292
Specific Reserve	59	62
General Allocation	805	2,230
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	2,120	1,282
Charge-offs	(3,918)	(3,982)
Recoveries	351	649
Provision (recapture) for loan and lease losses	4,166	4,171
Balance at the end of year	2,719	2,120
Specific Reserve	30	0
General Allocation	2,689	2,120
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	3,283	1,437
Charge-offs	0	0
Recoveries	0	0
Provision (recapture) for loan and lease losses	(2,589)	1,846
Balance at the end of year	694	3,283
Specific Reserve	0	0
General Allocation	$ 694	$ 3,283