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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment $ 58,244 $ 66,351
Collectively evaluated for impairment 3,322,228 3,168,733
Loans acquired with deteriorated credit quality 6,674 7,343
Non-residential real estate owner occupied [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 6,095 6,163
Collectively evaluated for impairment 448,937 474,491
Loans acquired with deteriorated credit quality     
Non-residential real estate other [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 26,684 30,602
Collectively evaluated for impairment 836,698 710,989
Loans acquired with deteriorated credit quality     
Residential real estate primary mortgage [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 7,174 6,605
Collectively evaluated for impairment 258,806 242,292
Loans acquired with deteriorated credit quality     
Residential real estate all other [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 9,881 12,887
Collectively evaluated for impairment 557,992 493,149
Loans acquired with deteriorated credit quality     
Non-consumer non-real estate [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 5,731 7,599
Collectively evaluated for impairment 789,584 777,524
Loans acquired with deteriorated credit quality     
Consumer non-real estate [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 2,362 2,260
Collectively evaluated for impairment 225,972 219,487
Loans acquired with deteriorated credit quality     
Other loans [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment 317 235
Collectively evaluated for impairment 145,039 149,662
Loans acquired with deteriorated credit quality     
Acquired loans [Member]
    
Financial Receivables Impaired Or Restructured [Line Items]    
Individually evaluated for impairment      
Collectively evaluated for impairment 59,200 101,139
Loans acquired with deteriorated credit quality $ 6,674 $ 7,343