Noncovered Loans (Analysis of Impaired Loans) (Details) (Noncovered Loans [Member], USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	$ 2,588,387		$ 2,491,049
Recorded Investment of Loans Individually Measured for Specific Impairment	32,825		34,661
Average Recorded Investment Impaired Loans	33,743	56,276
Interest Recognized on Impaired Loans	322	891
Impaired Loans With Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,457		4,405
Unpaid Principal Balance	1,648		5,787
Related Allowance	385		1,395
Impaired Loans Without Recorded Allowance [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	31,368		30,256
Unpaid Principal Balance	45,554		44,410
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	44,231		45,251
Recorded Investment of Loans Individually Measured for Specific Impairment	84		92
Recorded Investment	84		92
Unpaid Principal Balance	84		92
Related Allowance	84		92
Average Recorded Investment Impaired Loans	88	119
Interest Recognized on Impaired Loans	1	1
Commercial Portfolio Segment [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	1,152,246		1,101,689
Recorded Investment of Loans Individually Measured for Specific Impairment	4,972		4,862
Recorded Investment	293		690
Unpaid Principal Balance	414		1,994
Related Allowance	67		113
Average Recorded Investment Impaired Loans	4,917	9,709
Interest Recognized on Impaired Loans	4	309
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	388,437		383,269
Recorded Investment of Loans Individually Measured for Specific Impairment	11,337		11,904
Recorded Investment	605		608
Unpaid Principal Balance	606		610
Related Allowance	34		38
Average Recorded Investment Impaired Loans	11,620	14,152
Interest Recognized on Impaired Loans	279	107
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	646,457		606,656
Recorded Investment of Loans Individually Measured for Specific Impairment	9,265		8,156
Recorded Investment	18		2,670
Unpaid Principal Balance	66		2,727
Related Allowance	18		1,040
Average Recorded Investment Impaired Loans	8,710	8,083
Interest Recognized on Impaired Loans	29	115
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	45,366		44,672
Recorded Investment of Loans Individually Measured for Specific Impairment	2,772		2,655
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	2,714	3,405
Interest Recognized on Impaired Loans	0	0
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	42,380		42,103
Recorded Investment of Loans Individually Measured for Specific Impairment	1,544		2,089
Recorded Investment	340		345
Unpaid Principal Balance	362		364
Related Allowance	108		112
Average Recorded Investment Impaired Loans	1,816	2,266
Interest Recognized on Impaired Loans	4	1
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	31,011		29,707
Recorded Investment of Loans Individually Measured for Specific Impairment	145		1,957
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	1,051	4,286
Interest Recognized on Impaired Loans	2	358
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	18,914		15,677
Recorded Investment of Loans Individually Measured for Specific Impairment	2,580		2,819
Recorded Investment	117		0
Unpaid Principal Balance	116		0
Related Allowance	74		0
Average Recorded Investment Impaired Loans	2,700	6,539
Interest Recognized on Impaired Loans	1	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	42,192		36,211
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0
Real Estate Construction Portfolio Segment [Member] | Owner Occupied Construction [Member] [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] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	24,479		28,342
Recorded Investment of Loans Individually Measured for Specific Impairment	0		0
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	0	6,045
Interest Recognized on Impaired Loans	0	0
Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment of Loans Collectively Measured for Contingency Provision	152,674		157,472
Recorded Investment of Loans Individually Measured for Specific Impairment	126		127
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Related Allowance	0		0
Average Recorded Investment Impaired Loans	127	1,672
Interest Recognized on Impaired Loans	2	0
Impaired Loans Without Recorded Allowance [Member] | Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Impaired Loans Without Recorded Allowance [Member] | Commercial Portfolio Segment [Member] | Secured Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	4,680		4,172
Unpaid Principal Balance	7,488		6,769
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	10,732		11,296
Unpaid Principal Balance	14,135		14,642
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	9,246		5,486
Unpaid Principal Balance	12,442		7,860
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | Commercial Land [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	2,772		2,655
Unpaid Principal Balance	5,845		5,727
Impaired Loans Without Recorded Allowance [Member] | Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	1,204		1,744
Unpaid Principal Balance	1,341		1,902
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	145		1,957
Unpaid Principal Balance	144		2,570
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Land And Acquisition [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	2,463		2,819
Unpaid Principal Balance	4,033		4,813
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Owner Occupied Construction [Member] [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Impaired Loans Without Recorded Allowance [Member] | Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	0		0
Unpaid Principal Balance	0		0
Impaired Loans Without Recorded Allowance [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Recorded Investment	126		127
Unpaid Principal Balance	$ 126		$ 127