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	9 Months Ended		15 Months Ended
	Sep. 30, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012
Allowance for Loan and Lease Losses [Roll Forward]
Provision for loan and lease losses		$ 34,506	$ 4,962
Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	52,196	53,041	60,993	54,057
Charged-offs	(5,241)	(17,272)	(16,653)	(4,872)
Recoveries	1,697	4,633	3,432	737
Provision for loan and lease losses	2,875	11,125	2,650	500
Ending balance	51,527	51,527	50,422	51,527
Specific Reserve	730	730	966	730
General Allocation	50,797	50,797	49,456	50,797
Commercial Portfolio Segment [Member] | Secured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	26,505	24,745	21,811	22,320
Charged-offs	(3,744)	(8,126)	(6,025)	(1,904)
Recoveries	194	1,184	749	420
Provision for loan and lease losses	3,007	8,159	6,763	2,462
Ending balance	25,962	25,962	23,298	25,962
Specific Reserve	315	315	54	315
General Allocation	25,647	25,647	23,244	25,647
Commercial Portfolio Segment [Member] | Unsecured Loans [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	772	689	738	573
Charged-offs	(31)	(52)	(126)	(42)
Recoveries	83	130	408	40
Provision for loan and lease losses	(56)	1	(282)	167
Ending balance	768	768	738	768
Specific Reserve	100	100	0	100
General Allocation	668	668	738	668
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	673	654	1,100	847
Charged-offs	(49)	(499)	(717)	(53)
Recoveries	157	202	78	78
Provision for loan and lease losses	(216)	208	481	70
Ending balance	565	565	942	565
Specific Reserve	69	69	0	69
General Allocation	496	496	942	496
Real Estate Portfolio Segment [Member] | Commercial Land [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	270	488	634	894
Charged-offs	(55)	(437)	(660)	(4)
Recoveries	0	0	0	0
Provision for loan and lease losses	207	371	786	(130)
Ending balance	422	422	760	422
Specific Reserve	1	1	0	1
General Allocation	421	421	760	421
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	8,726	9,551	15,210	14,709
Charged-offs	(436)	(3,959)	(979)	(339)
Recoveries	357	710	65	10
Provision for loan and lease losses	387	2,732	(5,323)	(5,407)
Ending balance	9,034	9,034	8,973	9,034
Specific Reserve	0	0	297	0
General Allocation	9,034	9,034	8,676	9,034
Real Estate Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	9,037	9,606	9,692	6,479
Charged-offs	(101)	(712)	(723)	(100)
Recoveries	89	628	31	0
Provision for loan and lease losses	(694)	(1,191)	(2,310)	311
Ending balance	8,331	8,331	6,690	8,331
Specific Reserve	245	245	408	245
General Allocation	8,086	8,086	6,282	8,086
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	755	665	274	43
Charged-offs	0	(93)	(1,710)	(145)
Recoveries	63	64	0	0
Provision for loan and lease losses	(456)	(274)	1,491	157
Ending balance	362	362	55	362
Specific Reserve	0	0	0	0
General Allocation	362	362	55	362
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	68	35	70	34
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	23	56	(43)	(7)
Ending balance	91	91	27	91
Specific Reserve	0	0	0	0
General Allocation	91	91	27	91
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,651	2,331	3,769	2,852
Charged-offs	(307)	(809)	(1,347)	(169)
Recoveries	404	827	1,831	63
Provision for loan and lease losses	(279)	(880)	(1,238)	269
Ending balance	1,469	1,469	3,015	1,469
Specific Reserve	0	0	175	0
General Allocation	1,469	1,469	2,840	1,469
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	1,197	864	2,292	1,704
Charged-offs	(18)	(617)	(1,068)	(14)
Recoveries	0	79	92	56
Provision for loan and lease losses	3	856	208	(222)
Ending balance	1,182	1,182	1,524	1,182
Specific Reserve	0	0	0	0
General Allocation	1,182	1,182	1,524	1,182
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	2,049	2,719	2,120	2,748
Charged-offs	(500)	(1,968)	(3,298)	(2,102)
Recoveries	350	809	178	70
Provision for loan and lease losses	267	606	4,701	2,985
Ending balance	2,166	2,166	3,701	2,166
Specific Reserve	0	0	32	0
General Allocation	2,166	2,166	3,669	2,166
Unallocated Financing Receivables [Member] | Noncovered Loans [Member]
Allowance for Loan and Lease Losses [Roll Forward]
Beginning balance	493	694	3,283	854
Charged-offs	0	0	0	0
Recoveries	0	0	0	0
Provision for loan and lease losses	682	481	(2,584)	(155)
Ending balance	1,175	1,175	699	1,175
Specific Reserve	0	0	0	0
General Allocation	$ 1,175	$ 1,175	$ 699	$ 1,175