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	Sep. 30, 2014	Jun. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Dec. 31, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 4,755,151		$ 4,444,842
Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,579,178		4,219,451
Recorded Investment	4,579,178		4,219,451
Loans and Leases Receivable, Allowance	49,938	49,494	52,280	55,844	51,698	52,244
Loans, net	4,529,240		4,167,171
Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,453,712		4,027,764
Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	52,614		53,231
Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	72,852		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	317,726		328,334
Loans and Leases Receivable, Allowance	2,865	2,643	2,547	2,519	2,455	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	313,423		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	0		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	4,303		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	1,758,330		1,483,647
Loans and Leases Receivable, Allowance	24,747	25,519	31,027	34,110	30,572	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	1,678,642		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	43,841		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	35,847		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	66,702		72,604
Loans and Leases Receivable, Allowance	889	754	696	1,060	821	753
Unsecured Loans [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	66,261		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	198		199
Unsecured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	243		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	106,812		105,892
Loans and Leases Receivable, Allowance	1,376	1,083	1,252	1,341	672	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	102,126		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	4,631		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	139,797		142,834
Loans and Leases Receivable, Allowance	397	470	489	548	691	460
Commercial Land [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	137,651		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	2,146		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	1,214,524		1,146,432
Loans and Leases Receivable, Allowance	9,810	10,511	9,234	9,802	9,695	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	1,197,040		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	4,468		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	13,016		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	765,474		760,609
Loans and Leases Receivable, Allowance	4,795	4,990	3,605	4,688	4,515	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	754,446		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	3,153		0
Owner Occupied [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	7,875		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	13,004		11,670
Loans and Leases Receivable, Allowance	1,282	403	610	725	769	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	11,307		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	1,697		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	60,299		41,992
Loans and Leases Receivable, Allowance	1,798	677	822	725	204	635
Residential Construction [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	57,205		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	3,094		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	85,090		86,521
Loans and Leases Receivable, Allowance	949	414	285	258	241	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	85,090		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	51,420		38,916
Loans and Leases Receivable, Allowance	334	166	58	68	80	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	50,521		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	899		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