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Loans and Allowance for Loan Losses - Loans Outstanding by Impairment Methodology (Detail) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Jun. 30, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment $ 90,721 $ 61,659
Collectively evaluated for impairment 3,557,962 3,176,974
Loans acquired with deteriorated credit quality 17,225 6,451
Non-residential real estate owner occupied [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 6,758 5,713
Collectively evaluated for impairment 476,064 440,503
Non-residential real estate other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 25,023 29,855
Collectively evaluated for impairment 901,131 775,253
Residential real estate permanent mortgage [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 6,932 6,479
Collectively evaluated for impairment 278,697 245,254
Residential real estate all other [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 8,094 11,052
Collectively evaluated for impairment 592,797 529,969
Non-consumer non-real estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 41,460 6,075
Collectively evaluated for impairment 820,596 743,587
Consumer non-real estate [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 2,130 2,205
Collectively evaluated for impairment 231,213 215,175
Other loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment 324 280
Collectively evaluated for impairment 147,945 147,225
Acquired loans [Member]
   
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Individually evaluated for impairment     
Collectively evaluated for impairment 109,519 80,008
Loans acquired with deteriorated credit quality $ 17,225 $ 6,451