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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 2,190,519 $ 1,749,131
Carrying amount, net of allowance 2,172,789 1,730,806
Loans Purchased With Evidence of Credit Deterioration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 18,286 10,390
Carrying amount, net of allowance 18,286 10,327
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 14,312 8,261
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 3,963 2,088
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 11 41
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,474 2,332
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 867 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 605 693
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 2 6
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 6,321 6,818
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 5,323 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 989 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 928 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 724 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 204 $ 179
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 2,159  
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,667  
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 492  
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 7,404  
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 5,731  
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 1,673