v2.4.0.6
Allowance for Noncovered Loan and Lease Losses and Unfunded Commitments and Letters of Credit (Analysis of Credit Quality of Noncovered Loan Portfolio) (Details) (Noncovered Loans [Member], USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
risk_rating
Dec. 31, 2010
risk_rating
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Recorded Investment Noncovered Loans   $ 1,927,191
Total noncovered loans, net of unearned income 2,348,371 1,915,754
Commercial Portfolio Segment [Member] | Secured Loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 4.89 4.96
Recorded Investment Noncovered Loans   757,372
Total noncovered loans, net of unearned income 981,417  
Commercial Portfolio Segment [Member] | Unsecured Loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 4.25 4.23
Recorded Investment Noncovered Loans   41,175
Total noncovered loans, net of unearned income 47,406  
Real Estate Portfolio Segment [Member] | One-to-Four Family Residential [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 4.81 4.96
Recorded Investment Noncovered Loans   49,436
Total noncovered loans, net of unearned income 64,063  
Real Estate Portfolio Segment [Member] | Commercial Land [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 5.22 5.75
Recorded Investment Noncovered Loans   24,956
Total noncovered loans, net of unearned income 50,681  
Real Estate Portfolio Segment [Member] | Income Property Multifamily [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 4.94 5.07
Recorded Investment Noncovered Loans   406,711
Total noncovered loans, net of unearned income 533,993  
Real Estate Portfolio Segment [Member] | Owner Occupied [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 5.05 5.12
Recorded Investment Noncovered Loans   366,284
Total noncovered loans, net of unearned income 404,789  
Real Estate Construction Portfolio Segment [Member] | Income Property Multifamily [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 5.49 6.38
Recorded Investment Noncovered Loans   18,296
Total noncovered loans, net of unearned income 20,877  
Real Estate Construction Portfolio Segment [Member] | Owner Occupied [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 4.55 4.93
Recorded Investment Noncovered Loans   11,990
Total noncovered loans, net of unearned income 12,790  
Real Estate Construction Portfolio Segment [Member] | Land And Acquisition [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 6.43 6.79
Recorded Investment Noncovered Loans   37,054
Total noncovered loans, net of unearned income 25,201  
Real Estate Construction Portfolio Segment [Member] | Residential Construction [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 5.94 6.63
Recorded Investment Noncovered Loans   31,293
Total noncovered loans, net of unearned income 23,931  
Consumer Portfolio Segment [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Weighted-Average Risk Rating 4.24 4.31
Recorded Investment Noncovered Loans   182,624
Total noncovered loans, net of unearned income $ 183,223