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Noncovered Loans (Analysis of Loan Portfolio by Major Types of Loans) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Mar. 31, 2011
Dec. 31, 2010
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Deferred Income $ 12,865 $ 16,217    
Loans, net 2,821,148 2,827,259    
Loans held for sale 2,066 2,148    
Noncovered Loans [Member]
       
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Deferred Income 12,865 16,217    
Loans and Leases Receivable, Net of Deferred Income 2,371,818 2,348,371    
Allowance for loan losses 52,283 53,041 55,315 60,993
Loans, net 2,319,535 2,295,330    
Loans held for sale 2,066 2,148    
Commercial Portfolio Segment [Member] | Noncovered Loans [Member]
       
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable, Gross, Commercial and Industrial 1,079,356 1,031,721    
Real Estate Portfolio Segment [Member] | Noncovered Loans [Member]
       
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Mortgage 1,051,246 1,062,656    
Real Estate Construction Portfolio Segment [Member] | Noncovered Loans [Member]
       
Financing Receivable, Recorded Investment [Line Items]        
Loans Receivable Real Estate Construction 84,126 86,976    
Consumer Portfolio Segment [Member] | Noncovered Loans [Member]
       
Financing Receivable, Recorded Investment [Line Items]        
Loans and Leases Receivable, Gross, Consumer 169,955 183,235    
Loans and Leases Receivable, Net of Deferred Income 170,022      
Allowance for loan losses 2,129 2,719 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 58,843 64,491    
Loans and Leases Receivable, Net of Deferred Income 58,876      
Allowance for loan losses 689 654 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 48,559 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 992,403 998,165    
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 $ 35,567 $ 36,768