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, 2013	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net	$ 4,440,048		$ 2,864,803
Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,193,732		2,525,710
Recorded Investment	4,193,732		2,525,710
Loans and Leases Receivable, Allowance	55,844	51,698	52,244	51,527	52,196	53,041
Loans, net	4,137,888		2,473,466
Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,973,472		2,336,039
Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	55,176		37,758
Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	164,932		151,913
Doubtful [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	0		0
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	152		0
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	331,395		157,599
Loans and Leases Receivable, Allowance	2,519	2,455	2,437	2,166	2,049	2,719
Consumer Portfolio Segment [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	324,274		151,049
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	331		75
Consumer Portfolio Segment [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	6,789		6,475
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		0
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	1		0
Secured Loans [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,487,348		1,106,551
Loans and Leases Receivable, Allowance	34,110	30,572	27,270	25,962	26,505	24,745
Secured Loans [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,362,097		1,011,722
Secured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	38,018		29,222
Secured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	87,232		65,607
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	1		0
Unsecured Loans [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	74,988		45,343
Loans and Leases Receivable, Allowance	1,060	821	753	768	772	689
Unsecured Loans [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	74,705		44,788
Unsecured Loans [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	23		26
Unsecured Loans [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	260		529
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	104,089		44,192
Loans and Leases Receivable, Allowance	1,341	672	694	565	673	654
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	94,947		40,346
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	1,687		406
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	7,455		3,440
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	134,832		47,327
Loans and Leases Receivable, Allowance	548	691	460	422	270	488
Commercial Land [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	128,624		43,401
Commercial Land [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	2,140		0
Commercial Land [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,068		3,926
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	1,140,455		614,812
Loans and Leases Receivable, Allowance	9,802	9,695	11,033	9,034	8,726	9,551
Income Property Multifamily [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,097,644		581,671
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	7,304		3,688
Income Property Multifamily [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	35,357		29,453
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	150		0
Owner Occupied [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	740,894		395,173
Loans and Leases Receivable, Allowance	4,688	4,515	6,362	8,331	9,037	9,606
Owner Occupied [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	721,373		357,063
Owner Occupied [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,521		1,848
Owner Occupied [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	18,000		36,262
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	12,240		18,496
Loans and Leases Receivable, Allowance	725	769	1,171	1,469	1,651	2,331
Land And Acquisition [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	8,003		12,741
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	172		1,351
Land And Acquisition [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	4,065		4,404
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	40,387		31,664
Loans and Leases Receivable, Allowance	725	204	635	1,182	1,197	864
Residential Construction [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	34,950		28,705
Residential Construction [Member] | Special Mention [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	3,980		1,142
Residential Construction [Member] | Substandard [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	1,457		1,817
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	88,040		28,342
Loans and Leases Receivable, Allowance	258	241	316	362	755	665
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	87,791		28,342
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	249		0
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	39,064		36,211
Loans and Leases Receivable, Allowance	68	80	102	91	68	35
Owner Occupied Construction [Member] | Pass [Member] | Noncovered Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans and Leases Receivable, Gross, Carrying Amount	39,064		36,211
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	0		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