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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 1,343,021 $ 1,068,828
Carrying amount, net of allowance 1,325,390 1,051,943
Loans Purchased With Evidence Of Credit Deterioration [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 138,368 60,294
Carrying amount, net of allowance 138,163 59,905
Loans Purchased With Evidence Of Credit Deterioration [Member] | Commercial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 86,173 37,048
Loans Purchased With Evidence Of Credit Deterioration [Member] | Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 34,802 11,761
Loans Purchased With Evidence Of Credit Deterioration [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 17,393 11,485
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 36,869 60,294
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 18,527 37,048
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 10,055 11,761
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 8,287 11,485
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 101,499   
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 67,646   
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 24,747   
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Consumer [Member]
    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 9,106