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	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan and lease losses			$ 35,623	$ 4,029
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	52,283	55,315	53,041	60,993
Charged-offs	(5,581)	(4,758)	(12,030)	(11,781)
Recoveries	1,744	1,350	2,935	2,695
Provision for loan and lease losses	3,750	2,150	8,250	2,150
Ending balance	52,196	54,057	52,196	54,057
Specific Reserve	4,265	1,298	4,265	1,298
General Allocation	47,931	52,759	47,931	52,759
Commercial Portfolio Segment [Member] | Secured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	25,542	22,307	24,745	21,811
Charged-offs	(2,028)	(834)	(4,382)	(4,121)
Recoveries	375	233	989	329
Provision for loan and lease losses	2,616	614	5,153	4,301
Ending balance	26,505	22,320	26,505	22,320
Specific Reserve	3,528	330	3,528	330
General Allocation	22,977	21,990	22,977	21,990
Commercial Portfolio Segment [Member] | Unsecured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	786	618	689	738
Charged-offs	(16)	0	(21)	(84)
Recoveries	3	359	47	368
Provision for loan and lease losses	(1)	(404)	57	(449)
Ending balance	772	573	772	573
Specific Reserve	136	72	136	72
General Allocation	636	501	636	501
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	689	1,100	654	1,100
Charged-offs	(334)	(216)	(449)	(664)
Recoveries	2	0	45	0
Provision for loan and lease losses	316	(37)	423	411
Ending balance	673	847	673	847
Specific Reserve	90	0	90	0
General Allocation	583	847	583	847
Real Estate Portfolio Segment [Member] | Commercial Land [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	693	555	488	634
Charged-offs	(77)	(656)	(382)	(656)
Recoveries	0	0	0	0
Provision for loan and lease losses	(346)	995	164	916
Ending balance	270	894	270	894
Specific Reserve	0	0	0	0
General Allocation	270	894	270	894
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	10,249	12,297	9,551	15,210
Charged-offs	(1,515)	(275)	(3,522)	(640)
Recoveries	336	13	354	55
Provision for loan and lease losses	(344)	2,674	2,343	84
Ending balance	8,726	14,709	8,726	14,709
Specific Reserve	49	301	49	301
General Allocation	8,677	14,408	8,677	14,408
Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,555	10,412	9,606	9,692
Charged-offs	(247)	(623)	(612)	(623)
Recoveries	486	0	538	31
Provision for loan and lease losses	243	(3,310)	(495)	(2,621)
Ending balance	9,037	6,479	9,037	6,479
Specific Reserve	0	286	0	286
General Allocation	9,037	6,193	9,037	6,193
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	223	127	665	274
Charged-offs	(93)	(1,078)	(93)	(1,565)
Recoveries	1	0	1	0
Provision for loan and lease losses	624	994	182	1,334
Ending balance	755	43	755	43
Specific Reserve	443	0	443	0
General Allocation	312	43	312	43
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	44	68	35	70
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	24	(34)	33	(36)
Ending balance	68	34	68	34
Specific Reserve	0	0	0	0
General Allocation	68	34	68	34
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,671	3,295	2,331	3,769
Charged-offs	(298)	(410)	(503)	(1,178)
Recoveries	376	700	423	1,768
Provision for loan and lease losses	(98)	(733)	(600)	(1,507)
Ending balance	1,651	2,852	1,651	2,852
Specific Reserve	0	148	0	148
General Allocation	1,651	2,704	1,651	2,704
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,002	2,118	864	2,292
Charged-offs	(599)	(395)	(599)	(1,054)
Recoveries	79	0	79	36
Provision for loan and lease losses	715	(19)	853	430
Ending balance	1,197	1,704	1,197	1,704
Specific Reserve	18	0	18	0
General Allocation	1,179	1,704	1,179	1,704
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,129	2,418	2,719	2,120
Charged-offs	(374)	(271)	(1,467)	(1,196)
Recoveries	86	45	459	108
Provision for loan and lease losses	208	556	338	1,716
Ending balance	2,049	2,748	2,049	2,748
Specific Reserve	1	161	1	161
General Allocation	2,048	2,587	2,048	2,587
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	700	0	694	3,283
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	(207)	854	(201)	(2,429)
Ending balance	493	854	493	854
Specific Reserve	0	0	0	0
General Allocation	$ 493	$ 854	$ 493	$ 854