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Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (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
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Deferred Income $ 75,293   $ 7,767      
Loans, net 4,440,048   2,864,803      
Loans held for sale 840   2,563      
Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Deferred Income 75,293   7,767      
Recorded Investment 4,193,732   2,525,710      
Allowance for loan losses 55,844 51,698 52,244 51,527 52,196 53,041
Loans, net 4,137,888   2,473,466      
Loans held for sale 840   2,563      
One-to-Four Family Residential [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 106,686   43,922      
Loans and Leases Receivable, Gross, Consumer, Construction 53,158   50,602      
Allowance for loan losses 1,341 672 694 565 673 654
Commercial and Multifamily Residential [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 2,048,910   1,061,201      
Loans Receivable, Gross, Commercial, Construction 128,120   65,101      
Commercial Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 1,569,343   1,155,158      
Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 2,155,596   1,105,123      
Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 181,278   115,703      
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 362,808   157,493      
Allowance for loan losses $ 2,519 $ 2,455 $ 2,437 $ 2,166 $ 2,049 $ 2,719