Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]
Loans, net	$ 4,444,842	$ 2,864,803
Loans held for sale	735	2,563
Noncovered Loans [Member]
Financing Receivable, Recorded Investment [Line Items]
Less: Net unearned income	(68,282)	(7,767)
Total noncovered loans, net of unearned income	4,219,451	2,525,710
Less: Allowance for loan and lease losses	(52,280)	(52,244)	(53,041)	(60,993)
Loans, net	4,167,171	2,473,466
Loans held for sale	735	2,563
Noncovered Loans [Member] | One-to-Four Family Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Real Estate	108,317	43,922
Real Estate Construction	54,155	50,602
Less: Allowance for loan and lease losses	(1,252)	(694)	(654)	(1,100)
Noncovered Loans [Member] | Commercial and Multifamily Residential [Member]
Financing Receivable, Recorded Investment [Line Items]
Real Estate	2,080,075	1,061,201
Real Estate Construction	126,390	65,101
Noncovered Loans [Member] | Commercial Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Commercial Business	1,561,782	1,155,158
Noncovered Loans [Member] | Real Estate Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Real Estate	2,188,392	1,105,123
Noncovered Loans [Member] | Real Estate Construction Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Total Real Estate Construction	180,545	115,703
Noncovered Loans [Member] | Consumer Portfolio Segment [Member]
Financing Receivable, Recorded Investment [Line Items]
Consumer	357,014	157,493
Less: Allowance for loan and lease losses	$ (2,547)	$ (2,437)	$ (2,719)	$ (2,120)