Noncovered Loans (Analysis of Impaired Loans) (Details) (Noncovered Loans [Member], USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 2,491,049	$ 2,290,083
Recorded Investment of Loans Individually Measured for Specific Impairment	34,661	58,288
Impaired Financing Receivable, Average Recorded Investment	47,524	71,060	102,600
Impaired Financing Receivable, Interest Income, Accrual Method	1,114	719	0
Impaired Loans Without Recorded Allowance [Member]
Recorded Investment	30,256	53,062
Unpaid Principal Balance	44,410	81,922
Impaired Loans With Recorded Allowance [Member]
Recorded Investment	4,405	5,226
Unpaid Principal Balance	5,787	7,329
Related Allowance	1,395	1,484
Commercial Portfolio Segment [Member] | Secured Loans [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,101,689	972,531
Recorded Investment of Loans Individually Measured for Specific Impairment	4,862	8,886
Recorded Investment	690	2,926
Unpaid Principal Balance	1,994	2,927
Related Allowance	113	954
Impaired Financing Receivable, Average Recorded Investment	8,978	15,578
Impaired Financing Receivable, Interest Income, Accrual Method	9	511
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	45,251	47,309
Recorded Investment of Loans Individually Measured for Specific Impairment	92	97
Recorded Investment	92	97
Unpaid Principal Balance	92	97
Related Allowance	92	97
Impaired Financing Receivable, Average Recorded Investment	113	138
Impaired Financing Receivable, Interest Income, Accrual Method	6	0
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	44,672	46,882
Recorded Investment of Loans Individually Measured for Specific Impairment	2,655	3,799
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment	3,124	4,263
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	606,656	527,362
Recorded Investment of Loans Individually Measured for Specific Impairment	8,156	6,631
Recorded Investment	2,670	687
Unpaid Principal Balance	2,727	759
Related Allowance	1,040	63
Impaired Financing Receivable, Average Recorded Investment	7,895	8,881
Impaired Financing Receivable, Interest Income, Accrual Method	77	59
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	383,269	390,225
Recorded Investment of Loans Individually Measured for Specific Impairment	11,904	14,564
Recorded Investment	608	274
Unpaid Principal Balance	610	274
Related Allowance	38	185
Impaired Financing Receivable, Average Recorded Investment	13,315	15,254
Impaired Financing Receivable, Interest Income, Accrual Method	1,004	18
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	42,103	61,584
Recorded Investment of Loans Individually Measured for Specific Impairment	2,089	2,479
Recorded Investment	345	582
Unpaid Principal Balance	364	590
Related Allowance	112	96
Impaired Financing Receivable, Average Recorded Investment	2,130	2,494
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Real Estate Construction Portfolio Segment [Member] | Land And Acquisition [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	15,677	17,813
Recorded Investment of Loans Individually Measured for Specific Impairment	2,819	7,388
Recorded Investment	0	450
Unpaid Principal Balance	0	948
Related Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment	4,465	8,972
Impaired Financing Receivable, Interest Income, Accrual Method	0	116
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	29,707	18,847
Recorded Investment of Loans Individually Measured for Specific Impairment	1,957	5,084
Recorded Investment	0	59
Unpaid Principal Balance	0	1,509
Related Allowance	0	59
Impaired Financing Receivable, Average Recorded Investment	3,223	4,535
Impaired Financing Receivable, Interest Income, Accrual Method	11	0
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	28,342	13,810
Recorded Investment of Loans Individually Measured for Specific Impairment	0	7,067
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Impaired Financing Receivable, Average Recorded Investment	3,169	7,065
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	36,211	12,790
Recorded Investment of Loans Individually Measured for Specific Impairment	0	0
Impaired Financing Receivable, Average Recorded Investment	0	0
Impaired Financing Receivable, Interest Income, Accrual Method	0	0
Real Estate Construction Portfolio Segment [Member] | Owner Occupied Construction [Member] [Member]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Related Allowance	0	0
Consumer Portfolio Segment [Member]
Recorded Investment of Loans Collectively Measured for Contingency Provision	157,472	180,930
Recorded Investment of Loans Individually Measured for Specific Impairment	127	2,293
Recorded Investment	0	151
Unpaid Principal Balance	0	225
Related Allowance	0	30
Impaired Financing Receivable, Average Recorded Investment	1,112	3,880
Impaired Financing Receivable, Interest Income, Accrual Method	7	15
Impaired Loans Without Recorded Allowance [Member] | Commercial Portfolio Segment [Member] | Secured Loans [Member]
Recorded Investment	4,172	5,960
Unpaid Principal Balance	6,769	12,109
Impaired Loans Without Recorded Allowance [Member] | Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Recorded Investment	2,655	3,799
Unpaid Principal Balance	5,727	6,773
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Recorded Investment	5,486	5,944
Unpaid Principal Balance	7,860	7,700
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Recorded Investment	11,296	14,290
Unpaid Principal Balance	14,642	18,524
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Recorded Investment	1,744	1,897
Unpaid Principal Balance	1,902	2,136
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Land And Acquisition [Member]
Recorded Investment	2,819	6,938
Unpaid Principal Balance	4,813	11,978
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Recorded Investment	1,957	5,025
Unpaid Principal Balance	2,570	5,116
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Recorded Investment	0	7,067
Unpaid Principal Balance	0	14,947
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Owner Occupied Construction [Member] [Member]
Recorded Investment	0	0
Unpaid Principal Balance	0	0
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member]
Recorded Investment	127	2,142
Unpaid Principal Balance	$ 127	$ 2,639