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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 3,621,057 | $ 3,013,332 |  |
Allowance for loan losses | 17,821 | 17,820 | $ 16,474 | $ 16,394
Carrying Amount | 3,606,340 | 2,998,951 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 25,414 | 15,162 |  |
Allowance for loan losses | 296 | 60 |  |
Carrying Amount | 25,118 | 15,102 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 20,398 | 13,245 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 3,728 | 1,890 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 1,288 | 27 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 393 | 407 |  |
Carrying Amount | 393 | 407 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 229 | 232 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 164 | 175 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 755 | 878 |  |
Carrying Amount | 755 | 878 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 220 | 323 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 535 | 555 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 304 | 328 |  |
Carrying Amount | 304 | 328 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 260 | 270 |  |
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 | 44 | 58 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 875 | 901 |  |
Allowance for loan losses | 296 |  |  |
Carrying Amount | 579 | 901 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 712 | 746 |  |
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 | 163 | 155 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 1,570 | 1,727 |  |
Allowance for loan losses |  | 60 |  |
Carrying Amount | 1,570 | 1,667 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 708 | 753 |  |
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 | 836 | 947 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 26 | 27 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 2,204 | 3,080 |  |
Carrying Amount | 2,204 | 3,080 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 2,204 | 3,080 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 5,736 | 7,841 |  |
Carrying Amount | 5,736 | 7,841 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 5,736 | $ 7,841 |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 13,577 |  |  |
Carrying Amount | 13,577 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] | Commercial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 10,329 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] | Real Estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | 1,986 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] | Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Outstanding balance | $ 1,262 |  |  |

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