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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Oct. 17, 2017 | Sep. 01, 2017 | Feb. 03, 2017 | Jul. 18, 2016 | Jun. 01, 2016 | Jul. 01, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 31, 2017 | Nov. 07, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | [1] |  |  |  |  |  |  | 25,529,819 | 22,171,596 |  |  |
Acquisition of goodwill |  |  |  |  |  |  |  | $ 119,880,000 | $ 76,941,000 | $ 49,600,000 |  |
Ownership interest percentage |  |  | 5.00% |  |  |  |  |  |  |  |  |
Operating revenue, net of tax |  |  |  |  |  |  |  | 2,600,000 | 4,300,000 | 2,300,000 |  |
Non-recurring expense, net of tax |  |  |  |  |  |  |  | $ 2,700,000 | 4,800,000 | 3,300,000 |  |
Peoples Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  |  |  |  |  |  | 142.50% |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  |  | 2,311,858 |  |  |  |  |
Common stock issued |  |  |  |  |  |  | 3,288,303 |  |  |  |  |
Market closing price per share |  |  |  |  |  |  | $ 16.88 |  |  |  |  |
Costs related to the acquisition |  |  |  |  |  |  |  |  |  | $ 4,900,000 |  |
Total estimated purchase price |  |  |  |  |  |  | $ 78,147,000 |  |  |  |  |
Net intangible assets acquired |  |  |  |  |  |  | 4,394,000 |  |  |  |  |
Acquisition of goodwill |  |  |  |  |  |  | 21,424,000 |  |  |  |  |
Purchase price of the business assets, portion deductible |  |  |  |  |  |  | $ 0 |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  |  |  | 10 years |  |
Share of common stock outstanding per share |  |  |  |  |  |  | $ 9.75 |  |  |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  |  |  | $ (182,413,000) |  |
Performing portion of the loan portfolio acquired |  |  |  |  |  |  | $ 223,400,000 |  |  |  |  |
Estimated fair value of performing portion of the loan portfolio |  |  |  |  |  |  | 220,000,000 |  |  |  |  |
Loan portfolio acquired |  |  |  |  |  |  | 228,600,000 |  |  |  |  |
Discount on loan portfolio acquired |  |  |  |  |  |  | $ 4,800,000 |  |  |  |  |
Peoples Bancorp Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares owned |  |  |  |  |  |  | 100 |  |  |  |  |
Share of common stock outstanding per share |  |  |  |  |  |  | $ 33.14 |  |  |  |  |
Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  |  |  |  |  | 451.83% |  |  |  |  |  |
Cash paid for each share |  |  |  |  |  | $ 81.75 |  |  |  |  |  |
Common stock issued |  |  |  |  |  | 873,430 |  |  |  |  |  |
Market closing price per share |  |  |  |  |  | $ 16.57 |  |  |  |  |  |
Estimated transaction value |  |  |  |  |  | $ 23,000,000 |  |  |  |  |  |
Costs related to the acquisition |  |  |  |  |  | 2,000,000 |  |  |  |  |  |
Total estimated purchase price |  |  |  |  |  | 22,983,000 |  |  |  |  |  |
Net intangible assets acquired |  |  |  |  |  | 526,000 |  |  |  |  |  |
Acquisition of goodwill |  |  |  |  |  | 6,443,000 |  |  |  |  |  |
Purchase price of the business assets, portion deductible |  |  |  |  |  | $ 0 |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |  |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  |  | (30,437,000) |  |  |
Business combination stock transferred, percentage of consideration |  |  |  |  |  | 65.00% |  |  |  |  |  |
Business combination cash transferred, percentage of consideration |  |  |  |  |  | 35.00% |  |  |  |  |  |
Kosciusko Financial Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares owned |  |  |  |  |  | 100 |  |  |  |  |  |
Share of common stock outstanding per share |  |  |  |  |  | $ 81.75 |  |  |  |  |  |
LaPorte Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  |  |  |  | 94.35% |  |  |  |  |  |  |
Cash paid for each share |  |  |  |  | $ 17.50 |  |  |  |  |  |  |
Common stock issued |  |  |  |  | 3,421,488 |  |  |  |  |  |  |
Market closing price per share |  |  |  |  | $ 18.36 |  |  |  |  |  |  |
Estimated transaction value |  |  |  |  | $ 98,600,000 |  |  |  |  |  |  |
Costs related to the acquisition |  |  |  |  |  |  |  |  | $ 4,000,000 |  |  |
Total estimated purchase price |  |  |  |  | 98,634,000 |  |  |  |  |  |  |
Net intangible assets acquired |  |  |  |  | 2,514,000 |  |  |  |  |  |  |
Acquisition of goodwill |  |  |  |  | 20,993,000 |  |  |  |  |  |  |
Purchase price of the business assets, portion deductible |  |  |  |  | $ 0 |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  |  | 10 years |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  |  | $ (116,521,000) |  |  |
Business combination stock transferred, percentage of consideration |  |  |  |  | 65.00% |  |  |  |  |  |  |
Business combination cash transferred, percentage of consideration |  |  |  |  | 35.00% |  |  |  |  |  |  |
Central National Bank & Trust [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Costs related to the acquisition |  |  |  |  |  |  |  |  | $ 779,000 |  |  |
Total estimated purchase price |  |  |  |  |  |  |  |  |  |  |  | $ 5,311,000
Net intangible assets acquired |  |  |  |  |  |  |  |  |  |  |  | 190,000
Acquisition of goodwill |  |  |  |  |  |  |  |  |  |  |  | 609,000
Purchase price of the business assets, portion deductible |  |  |  |  |  |  |  |  |  |  |  | 5,311,000
Core deposit intangible amortization period |  |  |  |  |  |  |  |  | 10 years |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  |  | $ (22,549,000) |  |  |
Performing portion of the loan portfolio acquired |  |  |  |  |  |  |  |  |  |  |  | 10,800,000
Estimated fair value of performing portion of the loan portfolio |  |  |  |  |  |  |  |  |  |  |  | $ 10,500,000
Wolverine Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  | 101.52% |  |  |  |  |  |  |  |  |  |
Cash paid for each share |  | $ 14.00 |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  | 2,129,331 |  |  |  |  |  |  |  |  |  |
Common stock issued |  | 2,160,697 |  |  |  |  |  |  |  |  |  |
Market closing price per share |  | $ 29.06 |  |  |  |  |  |  |  |  |  |
Estimated transaction value |  | $ 93,800,000 |  |  |  |  |  |  |  |  |  |
Costs related to the acquisition |  | 1,900,000 |  |  |  |  |  |  |  |  |  |
Total estimated purchase price |  | 93,773,000 |  |  |  |  |  |  |  |  |  |
Net intangible assets acquired |  | 2,024,000 |  |  |  |  |  |  |  |  |  |
Acquisition of goodwill |  | 26,827,000 |  |  |  |  |  |  |  |  |  |
Purchase price of the business assets, portion deductible |  | $ 0 |  |  |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |  |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  | $ (12,788,000) |  |  |  |
Lafayette Community Bancorp [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  |  | 58.78% |  |  |  |  |  |  |  |  |
Cash paid for each share |  |  | $ 1.73 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  | 1,856,679 |  |  |  |  |  |  |  |  |
Common stock issued |  |  | 1,091,259 |  |  |  |  |  |  |  |  |
Market closing price per share |  |  |  |  |  |  |  |  |  |  | $ 26.17 |
Estimated transaction value |  |  |  |  |  |  |  |  |  |  | $ 34,500,000 |
Costs related to the acquisition |  |  | $ 1,700,000 |  |  |  |  |  |  |  |  |
Total estimated purchase price |  |  | 34,465,000 |  |  |  |  |  |  |  |  |
Net intangible assets acquired |  |  | 2,085,000 |  |  |  |  |  |  |  |  |
Acquisition of goodwill |  |  | 15,408,000 |  |  |  |  |  |  |  |  |
Purchase price of the business assets, portion deductible |  |  | 0 |  |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |  |  |  |
Gain on remeasurement of equity interest |  |  | $ 530,000 |  |  |  |  | $ 530,000 |  |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  | $ (20,425,000) |  |  |  |
Lafayette Community Bancorp [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares owned |  |  | 100 |  |  |  |  |  |  |  |  |
Share of common stock outstanding per share |  |  | $ 17.25 |  |  |  |  |  |  |  |  |
First Farmers Bank & Trust Co [Member] |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net intangible assets acquired |  |  |  | $ 452,000,000 |  |  |  |  |  |  |  |
Acquisition of goodwill |  |  |  | $ 0 |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  | 10 years |  |  |  |  |  |  |  |
Payments received as cash consideration |  |  |  | $ 11,000,000 |  |  |  |  |  |  |  |
Business acquisition, loans assumed |  |  |  | $ 3,400,000 |  |  |  |  |  |  |  |
Premium on deposits paid |  |  |  | 3.00% |  |  |  |  |  |  |  |
Business acquisition, customer deposit balances |  |  |  | $ 14,800,000 |  |  |  |  |  |  |  |
[1] | Adjusted for 3:2 stock split on November 14, 2016.

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