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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | $ 2,957,386 |  | $ 2,831,995 |  |  |
Allowance for loan losses | 17,798 | $ 17,071 | 16,394 | $ 15,586 | $ 15,027 | $ 14,837
Carrying Amount | 2,943,683 |  | 2,821,894 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 18,351 |  | 29,863 |  |  |
Allowance for loan losses | 121 |  |  |  |  |
Carrying Amount | 18,230 |  | 29,863 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 16,298 |  | 27,198 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 2,024 |  | 2,632 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 29 |  | 33 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 427 |  | 619 |  |  |
Carrying Amount | 427 |  | 619 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 242 |  | 390 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 185 |  | 229 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 2,038 |  | 4,523 |  |  |
Carrying Amount | 2,038 |  | 4,523 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,463 |  | 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 | 575 |  | 870 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 383 |  | 441 |  |  |
Carrying Amount | 383 |  | 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 | 280 |  | 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 | 103 |  | 126 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 968 |  | 1,241 |  |  |
Carrying Amount | 968 |  | 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 | 769 |  | 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 | 199 |  | 403 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,802 |  | 2,071 |  |  |
Allowance for loan losses | 106 |  |  |  |  |
Carrying Amount | 1,696 |  | 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 | 811 |  | 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 | 962 |  | 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 | 29 |  | 33 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 3,245 |  | 4,271 |  |  |
Allowance for loan losses | 15 |  |  |  |  |
Carrying Amount | 3,230 |  | 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 | 3,245 |  | 4,271 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 9,488 |  | 16,697 |  |  |
Carrying Amount | 9,488 |  | 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 | $ 9,488 |  | $ 16,697 |  |  |

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