Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of Noncovered Loan Portfolio) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 4,645,280		$ 4,444,842
Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,452,674		4,219,451
Recorded Investment	4,452,674		4,219,451
Loans and Leases Receivable, Allowance	49,494	50,442	52,280	51,698	51,119	52,244
Loans, net	4,403,180		4,167,171
Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,311,107		4,027,764
Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	49,588		53,231
Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	91,979		137,989
Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		467
Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	324,768		328,334
Loans and Leases Receivable, Allowance	2,643	2,637	2,547	2,455	2,364	2,437
Consumer Portfolio Segment [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	319,518		321,348
Consumer Portfolio Segment [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5		331
Consumer Portfolio Segment [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	5,245		6,188
Consumer Portfolio Segment [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		467
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,657,776		1,483,647
Loans and Leases Receivable, Allowance	25,517	28,801	31,027	30,572	26,871	27,270
Secured Loans [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,572,391		1,372,038
Secured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	41,465		43,309
Secured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	43,920		68,300
Secured Loans [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Secured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	73,252		72,604
Loans and Leases Receivable, Allowance	754	746	696	821	750	753
Unsecured Loans [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	72,825		72,226
Unsecured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	199		199
Unsecured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	228		179
Unsecured Loans [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Unsecured Loans [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	100,662		105,892
Loans and Leases Receivable, Allowance	1,083	1,194	1,252	672	657	694
One-to-Four Family Residential [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	95,647		98,626
One-to-Four Family Residential [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	55		1,567
One-to-Four Family Residential [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,960		5,699
One-to-Four Family Residential [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
One-to-Four Family Residential [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	148,821		142,834
Loans and Leases Receivable, Allowance	470	579	489	691	433	460
Commercial Land [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	145,901		137,850
Commercial Land [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,920		4,984
Commercial Land [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Commercial Land [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,198,289		1,146,432
Loans and Leases Receivable, Allowance	10,511	10,107	9,234	9,695	9,411	11,033
Income Property Multifamily [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,173,006		1,108,033
Income Property Multifamily [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,455		5,473
Income Property Multifamily [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	20,828		32,926
Income Property Multifamily [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	754,521		760,609
Loans and Leases Receivable, Allowance	4,989	4,560	3,605	4,515	5,458	6,362
Owner Occupied [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	742,585		748,725
Owner Occupied [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,996		0
Owner Occupied [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,940		11,884
Owner Occupied [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	11,480		11,670
Loans and Leases Receivable, Allowance	403	580	610	769	990	1,171
Land And Acquisition [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	9,758		7,526
Land And Acquisition [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,722		4,144
Land And Acquisition [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Land And Acquisition [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Residential Construction [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	49,551		41,992
Loans and Leases Receivable, Allowance	677	696	822	204	538	635
Residential Construction [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	46,335		36,270
Residential Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		2,352
Residential Construction [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,216		3,370
Residential Construction [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Residential Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily Construction [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	87,603		86,521
Loans and Leases Receivable, Allowance	414	320	285	241	382	316
Income Property Multifamily Construction [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	87,603		86,206
Income Property Multifamily Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily Construction [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		315
Income Property Multifamily Construction [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Income Property Multifamily Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied Construction [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	45,951		38,916
Loans and Leases Receivable, Allowance	166	154	58	80	108	102
Owner Occupied Construction [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	45,538		38,916
Owner Occupied Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	413		0
Owner Occupied Construction [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied Construction [Member] | Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
Owner Occupied Construction [Member] | Unlikely to be Collected Financing Receivable [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	$ 0		$ 0