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Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Deferred Income $ 11,666   $ 16,217      
Loans, net 2,847,759   2,827,259      
Loans held for sale 2,088   2,148      
Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Deferred Income 11,667   16,217      
Recorded Investment 2,436,961   2,348,371      
Allowance for loan losses 52,196 52,283 53,041 54,057 55,315 60,993
Loans, net 2,384,765   2,295,330      
Loans held for sale 2,088   2,148      
Commercial Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial and Industrial 1,111,440   1,031,721      
Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Mortgage 1,073,619   1,062,656      
Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable Real Estate Construction 96,182   86,976      
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer 167,387   183,235      
Recorded Investment 167,454   183,223      
Allowance for loan losses 2,049 2,129 2,719 2,748 2,418 2,120
One-to-Four Family Residential [Member] | Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Mortgage 55,883   64,491      
Recorded Investment 56,015   64,063      
Allowance for loan losses 673 689 654 847 1,100 1,100
One-to-Four Family Residential [Member] | Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans and Leases Receivable, Gross, Consumer, Construction 47,417   50,208      
Commercial and Multifamily Residential [Member] | Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Mortgage 1,017,736   998,165      
Commercial and Multifamily Residential [Member] | Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]
           
Financing Receivable, Recorded Investment [Line Items]            
Loans Receivable, Gross, Commercial, Construction $ 48,765   $ 36,768