Noncovered Loans (Analysis of Impaired Loans) (Details) (Noncovered Loans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 2,290,083	$ 1,828,071
Recorded Investment of Loans Individually Measured for Specific Impairment	58,288	91,173
Average Recorded Investment Impaired Loans	71,060
Interest Recognized on Impaired Loans	719
Impaired Loans Without Recorded Allowance [Member]
Recorded Investment	53,062	76,939
Unpaid Principal Balance	81,922	97,703
Impaired Loans With Recorded Allowance [Member]
Recorded Investment	5,226	17,188
Unpaid Principal Balance	7,329	23,984
Related Allowance	1,484	974
Commercial Portfolio Segment [Member] | Secured Loans [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	972,531	724,665
Recorded Investment of Loans Individually Measured for Specific Impairment	8,886	29,793
Average Recorded Investment Impaired Loans	15,578
Interest Recognized on Impaired Loans	511
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	47,309	40,808
Recorded Investment of Loans Individually Measured for Specific Impairment	97	104
Average Recorded Investment Impaired Loans	138
Interest Recognized on Impaired Loans	0
Commercial Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]
Recorded Investment	5,960	27,081
Unpaid Principal Balance	12,109	26,913
Commercial Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]
Recorded Investment	0	29
Unpaid Principal Balance	0	30
Commercial Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Secured Loans [Member]
Recorded Investment	2,926	2,717
Unpaid Principal Balance	2,927	2,758
Related Allowance	954	600
Commercial Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Unsecured Loans [Member]
Recorded Investment	97	75
Unpaid Principal Balance	97	75
Related Allowance	97	75
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	61,584	46,728
Recorded Investment of Loans Individually Measured for Specific Impairment	2,479	2,655
Average Recorded Investment Impaired Loans	2,494
Interest Recognized on Impaired Loans	0
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	46,882	20,959
Recorded Investment of Loans Individually Measured for Specific Impairment	3,799	3,863
Average Recorded Investment Impaired Loans	4,263
Interest Recognized on Impaired Loans	0
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	527,362	427,799
Recorded Investment of Loans Individually Measured for Specific Impairment	6,631	10,595
Average Recorded Investment Impaired Loans	8,881
Interest Recognized on Impaired Loans	59
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	390,225	317,010
Recorded Investment of Loans Individually Measured for Specific Impairment	14,564	14,103
Average Recorded Investment Impaired Loans	15,254
Interest Recognized on Impaired Loans	18
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Recorded Investment	1,897	2,658
Unpaid Principal Balance	2,136	2,949
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]
Recorded Investment	3,799	804
Unpaid Principal Balance	6,773	826
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Recorded Investment	5,944	10,292
Unpaid Principal Balance	7,700	12,253
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Recorded Investment	14,290	14,152
Unpaid Principal Balance	18,524	17,099
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Recorded Investment	582	0
Unpaid Principal Balance	590	0
Related Allowance	96	0
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Commercial Land [Member]
Recorded Investment	0	3,062
Unpaid Principal Balance	0	5,225
Related Allowance	0	0
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Income Property Multifamily [Member]
Recorded Investment	687	3,094
Unpaid Principal Balance	759	3,139
Related Allowance	63	59
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Owner Occupied [Member]
Recorded Investment	274	0
Unpaid Principal Balance	274	0
Related Allowance	185	0
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	13,810	10,666
Recorded Investment of Loans Individually Measured for Specific Impairment	7,067	7,584
Average Recorded Investment Impaired Loans	7,065
Interest Recognized on Impaired Loans	0
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	12,790	11,935
Recorded Investment of Loans Individually Measured for Specific Impairment	0	0
Average Recorded Investment Impaired Loans	0
Interest Recognized on Impaired Loans	0
Real Estate Construction Portfolio Segment [Member] | Land And Acquisition [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	17,813	25,362
Recorded Investment of Loans Individually Measured for Specific Impairment	7,388	11,543
Average Recorded Investment Impaired Loans	8,972
Interest Recognized on Impaired Loans	116
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	18,847	24,655
Recorded Investment of Loans Individually Measured for Specific Impairment	5,084	6,400
Average Recorded Investment Impaired Loans	4,535
Interest Recognized on Impaired Loans	0
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Recorded Investment	7,067	792
Unpaid Principal Balance	14,947	2,401
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Land And Acquisition [Member]
Recorded Investment	6,938	11,013
Unpaid Principal Balance	11,978	20,718
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member]
Recorded Investment	5,025	5,585
Unpaid Principal Balance	5,116	9,824
Real Estate Construction Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Income Property Multifamily [Member]
Recorded Investment	0	6,792
Unpaid Principal Balance	0	10,515
Related Allowance	0	175
Real Estate Construction Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Owner Occupied [Member]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Real Estate Construction Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Land And Acquisition [Member]
Recorded Investment	450	533
Unpaid Principal Balance	948	549
Related Allowance	0	3
Real Estate Construction Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Residential Construction [Member]
Recorded Investment	59	915
Unpaid Principal Balance	1,509	1,723
Related Allowance	59	62
Consumer Portfolio Segment [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	180,930	177,484
Recorded Investment of Loans Individually Measured for Specific Impairment	2,293	4,533
Average Recorded Investment Impaired Loans	3,880
Interest Recognized on Impaired Loans	15
Consumer Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member]
Recorded Investment	2,142	4,533
Unpaid Principal Balance	2,639	4,691
Consumer Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member]
Recorded Investment	151	0
Unpaid Principal Balance	225	0
Related Allowance	$ 30	$ 0