Noncovered Loans (Analysis of Impaired Loans) (Details) (Noncovered Loans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2012	Dec. 31, 2011
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 2,317,554	$ 2,290,083
Recorded Investment of Loans Individually Measured for Specific Impairment	54,264	58,288
Average Recorded Investment Impaired Loans	56,276	71,060
Interest Recognized on Impaired Loans	891	719
Impaired Loans Without Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	46,390	53,062
Unpaid Principal Balance	78,312	81,922
Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	7,874	5,226
Unpaid Principal Balance	9,490	7,329
Related Allowance	1,785	1,484
Commercial Portfolio Segment [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,017,869	972,531
Recorded Investment of Loans Individually Measured for Specific Impairment	10,533	8,886
Average Recorded Investment Impaired Loans	9,709	15,578
Interest Recognized on Impaired Loans	309	511
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	47,124	47,309
Recorded Investment of Loans Individually Measured for Specific Impairment	141	97
Average Recorded Investment Impaired Loans	119	138
Interest Recognized on Impaired Loans	1	0
Commercial Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	8,835	5,960
Unpaid Principal Balance	16,824	12,109
Commercial Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Commercial Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,698	2,926
Unpaid Principal Balance	1,698	2,927
Related Allowance	451	954
Commercial Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	141	97
Unpaid Principal Balance	141	97
Related Allowance	141	97
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	56,823	61,584
Recorded Investment of Loans Individually Measured for Specific Impairment	2,053	2,479
Average Recorded Investment Impaired Loans	2,266	2,494
Interest Recognized on Impaired Loans	1	0
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	42,369	46,882
Recorded Investment of Loans Individually Measured for Specific Impairment	3,011	3,799
Average Recorded Investment Impaired Loans	3,405	4,263
Interest Recognized on Impaired Loans	0	0
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	549,035	527,362
Recorded Investment of Loans Individually Measured for Specific Impairment	9,535	6,631
Average Recorded Investment Impaired Loans	8,083	8,881
Interest Recognized on Impaired Loans	115	59
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	366,457	390,225
Recorded Investment of Loans Individually Measured for Specific Impairment	13,739	14,564
Average Recorded Investment Impaired Loans	14,152	15,254
Interest Recognized on Impaired Loans	107	18
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,698	1,897
Unpaid Principal Balance	1,848	2,136
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	3,011	3,799
Unpaid Principal Balance	6,052	6,773
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	4,956	5,944
Unpaid Principal Balance	8,556	7,700
Real Estate Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	12,656	14,290
Unpaid Principal Balance	18,378	18,524
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	355	582
Unpaid Principal Balance	368	590
Related Allowance	72	96
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	4,579	687
Unpaid Principal Balance	4,612	759
Related Allowance	1,087	63
Real Estate Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,083	274
Unpaid Principal Balance	1,203	274
Related Allowance	16	185
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	14,212	13,810
Recorded Investment of Loans Individually Measured for Specific Impairment	5,023	7,067
Average Recorded Investment Impaired Loans	6,045	7,065
Interest Recognized on Impaired Loans	0	0
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	16,008	12,790
Recorded Investment of Loans Individually Measured for Specific Impairment	0	0
Average Recorded Investment Impaired Loans	0	0
Interest Recognized on Impaired Loans	0	0
Real Estate Construction Portfolio Segment [Member] | Land and Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	17,693	17,813
Recorded Investment of Loans Individually Measured for Specific Impairment	5,691	7,388
Average Recorded Investment Impaired Loans	6,539	8,972
Interest Recognized on Impaired Loans	0	116
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	20,993	18,847
Recorded Investment of Loans Individually Measured for Specific Impairment	3,487	5,084
Average Recorded Investment Impaired Loans	4,286	4,535
Interest Recognized on Impaired Loans	358	0
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	5,023	7,067
Unpaid Principal Balance	10,367	14,947
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
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]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	5,691	6,938
Unpaid Principal Balance	11,026	11,978
Real Estate Construction Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	3,469	5,025
Unpaid Principal Balance	4,209	5,116
Real Estate Construction Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
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] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
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]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0	450
Unpaid Principal Balance	0	948
Related Allowance	0	0
Real Estate Construction Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	18	59
Unpaid Principal Balance	1,468	1,509
Related Allowance	18	59
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	168,971	180,930
Recorded Investment of Loans Individually Measured for Specific Impairment	1,051	2,293
Average Recorded Investment Impaired Loans	1,672	3,880
Interest Recognized on Impaired Loans	0	15
Consumer Portfolio Segment [Member] | Impaired Loans Without Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,051	2,142
Unpaid Principal Balance	1,052	2,639
Consumer Portfolio Segment [Member] | Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0	151
Unpaid Principal Balance	0	225
Related Allowance	$ 0	$ 30