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Loan Portfolio Segment Balances (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases $ 2,475,078 $ 2,239,692
Commercial Business
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 334,040 260,327
Leases
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 5,618 6,954
Consumer
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 357,534 360,080
Residential Real Estate Portfolio Segment | Residential Mortgage
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 472,426 448,662
Residential Real Estate Portfolio Segment | Residential Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 130,791 108,699
Commercial Real Estate Portfolio Segment | Commercial Owner Occupied Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 579,812 522,076
Commercial Real Estate Portfolio Segment | Commercial Investor Real Estate
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases 443,237 371,948
Commercial Real Estate Portfolio Segment | Commercial Acquisition, Development and Construction
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases $ 151,620 $ 160,946