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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 |

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