Quarterly report pursuant to Section 13 or 15(d)

Loans - Allowance for Loan Losses by Portfolio Segment (Detail)

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Loans - Allowance for Loan Losses by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Allowance for Loan Losses:      
Beginning Balance $ 63,305 $ 89,936  
Charge-Offs (3,024) (12,321)  
Recoveries on Loans Previously Charged Off 714 1,037  
Provision 196 2,400  
Ending Balance 61,191 81,052  
Ending Balance: Individually Evaluated for Impairment 4,884 17,222  
Ending Balance: Collectively Evaluated for Impairment 56,307 63,830  
Loans Receivable:      
Ending Balance 2,121,686 1,976,978 2,048,560
Ending Balance: Individually Evaluated for Impairment 49,651 67,757  
Ending Balance: Collectively Evaluated for Impairment 2,072,035 1,909,221  
Real Estate Loans [Member]
      
Allowance for Loan Losses:      
Beginning Balance 18,180 19,637  
Charge-Offs (213) (2,842)  
Recoveries on Loans Previously Charged Off 8    
Provision (143) 5,435  
Ending Balance 17,832 22,230  
Ending Balance: Individually Evaluated for Impairment 95 536  
Ending Balance: Collectively Evaluated for Impairment 17,737 21,694  
Loans Receivable:      
Ending Balance 925,754 834,056 888,872
Ending Balance: Individually Evaluated for Impairment 8,047 16,395  
Ending Balance: Collectively Evaluated for Impairment 917,707 817,661  
Commercial and Industrial Loans [Member]
      
Allowance for Loan Losses:      
Beginning Balance 41,928 66,005  
Charge-Offs (2,647) (9,115)  
Recoveries on Loans Previously Charged Off 657 1,013  
Provision (378) (3,265)  
Ending Balance 39,560 54,638  
Ending Balance: Individually Evaluated for Impairment 4,388 16,686  
Ending Balance: Collectively Evaluated for Impairment 35,172 37,952  
Loans Receivable:      
Ending Balance 1,160,752 1,102,140 1,123,012
Ending Balance: Individually Evaluated for Impairment 39,965 50,960  
Ending Balance: Collectively Evaluated for Impairment 1,120,787 1,051,180  
Consumer Loans [Member]
      
Allowance for Loan Losses:      
Beginning Balance 2,280 2,243  
Charge-Offs (164) (364)  
Recoveries on Loans Previously Charged Off 49 24  
Provision (370) 341  
Ending Balance 1,795 2,244  
Ending Balance: Individually Evaluated for Impairment 401    
Ending Balance: Collectively Evaluated for Impairment 1,394 2,244  
Loans Receivable:      
Ending Balance 35,180 40,782 36,676
Ending Balance: Individually Evaluated for Impairment 1,639 402  
Ending Balance: Collectively Evaluated for Impairment 33,541 40,380  
Unallocated [Member]
      
Allowance for Loan Losses:      
Beginning Balance 917 2,051  
Provision 1,087 (111)  
Ending Balance 2,004 1,940  
Ending Balance: Collectively Evaluated for Impairment $ 2,004 $ 1,940