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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Mar. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 56,575 $ 63,351
Collectively evaluated for impairment 3,465,541 3,150,306
Loans acquired with deteriorated credit quality 20,154 6,310
Non-residential real estate owner occupied [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 6,555 5,542
Collectively evaluated for impairment 452,239 448,261
Loans acquired with deteriorated credit quality      
Non-residential real estate other [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 25,934 30,136
Collectively evaluated for impairment 853,571 760,103
Loans acquired with deteriorated credit quality      
Residential real estate permanent mortgage [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 7,477 6,561
Collectively evaluated for impairment 265,727 242,195
Loans acquired with deteriorated credit quality      
Residential real estate all other [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 7,562 12,236
Collectively evaluated for impairment 560,185 512,801
Loans acquired with deteriorated credit quality      
Non-consumer non-real estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 6,657 6,329
Collectively evaluated for impairment 821,382 744,272
Loans acquired with deteriorated credit quality      
Consumer non-real estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,082 2,301
Collectively evaluated for impairment 223,880 209,019
Loans acquired with deteriorated credit quality      
Other loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 308 246
Collectively evaluated for impairment 147,903 143,780
Loans acquired with deteriorated credit quality      
Acquired loans [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment      
Collectively evaluated for impairment 140,654 89,875
Loans acquired with deteriorated credit quality $ 20,154 $ 6,310