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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance $ 3,013,332 $ 2,835,180    
Allowance for loan losses 17,820 16,394 $ 14,837 $ 14,534
Carrying Amount 2,998,951 2,825,079    
Loans Purchased With Evidence of Credit Deterioration [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 15,162 29,863    
Allowance for loan losses 60      
Carrying Amount 15,102 29,863    
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 13,245 27,198    
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 1,890 2,632    
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 27 33    
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 407 619    
Carrying Amount 407 619    
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 232 390    
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 175 229    
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 878 4,523    
Carrying Amount 878 4,523    
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 323 3,653    
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 555 870    
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 328 441    
Carrying Amount 328 441    
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 270 315    
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 58 126    
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 901 1,241    
Carrying Amount 901 1,241    
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 746 838    
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 155 403    
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 1,727 2,071    
Allowance for loan losses 60      
Carrying Amount 1,667 2,071    
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 753 1,034    
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 947 1,004    
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Consumer [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 27 33    
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 3,080 4,271    
Allowance for loan losses 0      
Carrying Amount 3,080 4,271    
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 3,080 4,271    
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance 7,841 16,697    
Carrying Amount 7,841 16,697    
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Commercial [Member]        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Outstanding balance $ 7,841 $ 16,697