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, 2012	Dec. 31, 2011	Dec. 31, 2010
Allowance for Loan and Lease Losses [Roll Forward]
Provision (recapture) for loan and lease losses	$ 39,367	$ 5,752	$ 47,346
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	53,041	60,993	53,478
Charge-offs	(20,429)	(20,931)	(39,403)
Recoveries	6,157	5,579	5,627
Provision (recapture) for loan and lease losses	13,475	7,400	41,291
Balance at the end of year	52,244	53,041	60,993
Specific Reserve	1,395	1,484	974
General Allocation	50,849	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	24,745	21,811	20,409
Charge-offs	(10,029)	(7,270)	(12,779)
Recoveries	1,354	1,154	1,218
Provision (recapture) for loan and lease losses	11,200	9,050	12,963
Balance at the end of year	27,270	24,745	21,811
Specific Reserve	113	954	600
General Allocation	27,157	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	689	738	1,560
Charge-offs	(144)	(639)	(2,100)
Recoveries	194	1,444	1,171
Provision (recapture) for loan and lease losses	14	(854)	107
Balance at the end of year	753	689	738
Specific Reserve	92	97	75
General Allocation	661	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	654	1,100	1,072
Charge-offs	(549)	(717)	(406)
Recoveries	285	80	15
Provision (recapture) for loan and lease losses	304	191	419
Balance at the end of year	694	654	1,100
Specific Reserve	112	96	0
General Allocation	582	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	488	634	664
Charge-offs	(526)	(660)	(2,165)
Recoveries	63	12	0
Provision (recapture) for loan and lease losses	435	502	2,135
Balance at the end of year	460	488	634
Specific Reserve	0	0	0
General Allocation	460	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	9,551	15,210	9,860
Charge-offs	(4,030)	(1,407)	(1,969)
Recoveries	905	414	124
Provision (recapture) for loan and lease losses	4,607	(4,666)	7,195
Balance at the end of year	11,033	9,551	15,210
Specific Reserve	1,040	63	59
General Allocation	9,993	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	9,606	9,692	6,690
Charge-offs	(918)	(1,620)	(2,039)
Recoveries	631	33	2
Provision (recapture) for loan and lease losses	(2,957)	1,501	5,039
Balance at the end of year	6,362	9,606	9,692
Specific Reserve	38	185	0
General Allocation	6,324	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	665	274	2,453
Charge-offs	(93)	(2,213)	(3,107)
Recoveries	66	0	775
Provision (recapture) for loan and lease losses	(322)	2,604	153
Balance at the end of year	316	665	274
Specific Reserve	0	0	175
General Allocation	316	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	35	70	36
Charge-offs	0	0	0
Recoveries	0	0	0
Provision (recapture) for loan and lease losses	67	(35)	34
Balance at the end of year	102	35	70
Specific Reserve	0	0	0
General Allocation	102	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	2,331	3,769	5,711
Charge-offs	(989)	(1,419)	(8,409)
Recoveries	1,059	1,978	1,199
Provision (recapture) for loan and lease losses	(1,230)	(1,997)	5,268
Balance at the end of year	1,171	2,331	3,769
Specific Reserve	0	0	3
General Allocation	1,171	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	864	2,292	2,304
Charge-offs	(617)	(1,068)	(2,447)
Recoveries	429	113	474
Provision (recapture) for loan and lease losses	(41)	(473)	1,961
Balance at the end of year	635	864	2,292
Specific Reserve	0	59	62
General Allocation	635	805	2,230
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	2,719	2,120	1,282
Charge-offs	(2,534)	(3,918)	(3,982)
Recoveries	1,171	351	649
Provision (recapture) for loan and lease losses	1,081	4,166	4,171
Balance at the end of year	2,437	2,719	2,120
Specific Reserve	0	30	0
General Allocation	2,437	2,689	2,120
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Balance at beginning of year	694	3,283	1,437
Charge-offs	0	0	0
Recoveries	0	0	0
Provision (recapture) for loan and lease losses	317	(2,589)	1,846
Balance at the end of year	1,011	694	3,283
Specific Reserve	0	0	0
General Allocation	$ 1,011	$ 694	$ 3,283