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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 2,135,986 $ 1,749,131
Carrying amount, net of allowance 2,115,532 1,730,806
Loans Purchased With Evidence of Credit Deterioration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 14,843 10,390
Carrying amount, net of allowance 14,843 10,327
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 11,563 8,261
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 3,237 2,088
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 43 41
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,310 2,332
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 774 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 534 693
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 6,213 6,818
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 5,245 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 967 1,216
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 0 35
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 856 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 692 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 165 $ 179
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 2,109  
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,652  
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 457  
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 4,355  
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 3,200  
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 1,114  
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 41