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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 |  |

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