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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance $ 2,831,995 $ 2,135,986
Carrying amount, net of allowance 2,809,308 2,115,532
Loans Purchased With Evidence of Credit Deterioration [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 29,863 14,843
Carrying amount, net of allowance 29,863 14,843
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 27,198 11,563
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 2,632 3,237
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 33 43
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 619 1,310
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 390 774
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 229 534
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance   2
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 4,523 6,213
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 3,653 5,245
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 870 967
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 441 856
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Commercial [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 315 692
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 126 165
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 1,241 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 838 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 403 457
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 2,071 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 1,034 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 1,004 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 33 $ 41
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 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 4,271  
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Outstanding balance 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 $ 16,697