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Accounting for Certain Loans Acquired in a Transfer - Amounts of Loans (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | $ 3,664,668 |  | $ 3,013,332 |  |  |
Allowance for loan losses | 18,305 | $ 17,821 | 17,820 | $ 17,071 | $ 16,474 | $ 16,394
Carrying Amount | 3,655,509 |  | 2,998,951 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 22,345 |  | 15,162 |  |  |
Allowance for loan losses | 214 |  | 60 |  |  |
Carrying Amount | 22,131 |  | 15,102 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 17,697 |  | 13,245 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 3,528 |  | 1,890 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,120 |  | 27 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 369 |  | 407 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 369 |  | 407 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 217 |  | 232 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 152 |  | 175 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Heartland [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 728 |  | 878 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 728 |  | 878 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Commercial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 213 |  | 323 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 515 |  | 555 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Summit [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 289 |  | 328 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 289 |  | 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 | 249 |  | 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 | 40 |  | 58 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Peoples Bancorp Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 820 |  | 901 |  |  |
Allowance for loan losses | 195 |  |  |  |  |
Carrying Amount | 625 |  | 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 | 672 |  | 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 | 148 |  | 155 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Kosciusko Financial Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | LaPorte Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 1,505 |  | 1,727 |  |  |
Allowance for loan losses |  |  | 60 |  |  |
Carrying Amount | 1,505 |  | 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 | 663 |  | 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 | 818 |  | 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 | 24 |  | 27 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 2,002 |  | 3,080 |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 2,002 |  | 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 | 2,002 |  | 3,080 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Lafayette Community Bancorp [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 5,606 |  | 7,841 |  |  |
Allowance for loan losses | 19 |  |  |  |  |
Carrying Amount | 5,587 |  | 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 | 5,606 |  | $ 7,841 |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Wolverine Bancorp Inc [Member] | Consumer [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance |  |  |  |  |  |
Loans Purchased With Evidence of Credit Deterioration [Member] | Salin Bank and Trust Company [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Outstanding balance | 11,026 |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |
Carrying Amount | 11,026 |  |  |  |  |
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 | 8,075 |  |  |  |  |
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 | 1,855 |  |  |  |  |
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 | $ 1,096 |  |  |  |  |

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