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Loans - Activity in Allowance for Loan Losses by Portfolio Segment (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance $ 92,438 $ 104,453
Provision for loan losses 6,600 6,000
Charge-offs (6,666) (19,931)
Recoveries 2,784 3,067
Net charge-offs (3,882) (16,864)
Ending balance 95,156 93,589
Commercial and Industrial [Member]
    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 52,790 54,164
Provision for loan losses 5,960 13,448
Charge-offs (2,367) (17,152)
Recoveries 671 625
Net charge-offs (1,696) (16,527)
Ending balance 57,054 51,085
Commercial Real Estate [Member]
    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 22,590 29,346
Provision for loan losses 8 (4,866)
Charge-offs (1,791) (266)
Recoveries 213 595
Net charge-offs (1,578) 329
Ending balance 21,020 24,809
Consumer Real Estate [Member]
    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 5,230 5,252
Provision for loan losses (720) 172
Charge-offs (21) (336)
Recoveries 44 60
Net charge-offs 23 (276)
Ending balance 4,533 5,148
Consumer and Other [Member]
    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 5,010 3,507
Provision for loan losses 1,312 607
Charge-offs (2,487) (2,177)
Recoveries 1,856 1,787
Net charge-offs (631) (390)
Ending balance 5,691 3,724
Unallocated [Member]
    
Allowance for Loan and Lease Losses [Roll Forward]    
Beginning balance 6,818 12,184
Provision for loan losses 40 (3,361)
Charge-offs 0 0
Recoveries 0 0
Net charge-offs 0 0
Ending balance $ 6,858 $ 8,823