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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 1,937,825 $ 1,749,131
Carrying amount, net of allowance 1,920,553 1,730,806
Loans Purchased With Evidence Of Credit Deterioration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 17,429 10,390
Carrying amount, net of allowance 17,429 10,327
Loans Purchased With Evidence Of Credit Deterioration [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 14,978 8,261
Loans Purchased With Evidence Of Credit Deterioration [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 2,419 2,088
Loans Purchased With Evidence Of Credit Deterioration [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 32 41
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,885 2,332
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,243 1,633
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 641 693
Loans Purchased With Evidence Of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1 6
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 6,599 6,818
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 5,409 5,567
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,181 1,216
Loans Purchased With Evidence Of Credit Deterioration [Member] | Summit [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 9 35
Loans Purchased With Evidence Of Credit Deterioration [Member] | Peoples Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,031 1,240
Loans Purchased With Evidence Of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 750 1,061
Loans Purchased With Evidence Of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 281 $ 179
Loans Purchased With Evidence Of Credit Deterioration [Member] | Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 7,914  
Loans Purchased With Evidence Of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 7,576  
Loans Purchased With Evidence Of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 316  
Loans Purchased With Evidence Of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 22