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Acquisitions - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2017 | Feb. 03, 2017 | Jul. 18, 2016 | Jun. 01, 2016 | Oct. 17, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Aug. 31, 2017 | Nov. 07, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  |  | 38,375,407 | 38,294,729 |  |  |
Acquisition of goodwill |  |  |  |  |  | $ 119,880 | $ 119,880 | $ 76,941 |  |
Ownership interest percentage | 5.00% |  |  |  |  |  |  |  |  |
Operating revenue, net of tax |  |  |  |  |  |  | 2,600 | 4,300 |  |
Non-recurring expense, net of tax |  |  |  |  |  |  | 2,700 | 4,800 |  |
Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  |  |  | 6.7775% |  |  |  |  |  |
Cash paid for each share |  |  |  | $ 81.75 |  |  |  |  |  |
Common stock issued |  |  |  | 1,310,145 |  |  |  |  |  |
Market closing price per share |  |  |  | $ 11.04 |  |  |  |  |  |
Estimated transaction value |  |  |  | $ 23,000 |  |  |  |  |  |
Costs related to the acquisition |  |  |  | 2,000 |  |  |  |  |  |
Total purchase price |  |  |  | 22,983 |  |  |  |  |  |
Net intangible assets acquired |  |  |  | 526 |  |  |  |  |  |
Acquisition of goodwill |  |  |  | $ 6,443 |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  | 10 years |  |  |  |
Payments received as cash consideration |  |  |  |  |  |  |  | (30,437) |  |
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 |  |  | 1.4153% |  |  |  |  |  |  |
Cash paid for each share |  |  | $ 17.50 |  |  |  |  |  |  |
Common stock issued |  |  | 5,132,232 |  |  |  |  |  |  |
Market closing price per share |  |  | $ 12.24 |  |  |  |  |  |  |
Estimated transaction value |  |  | $ 98,600 |  |  |  |  |  |  |
Costs related to the acquisition |  |  |  |  |  |  |  | $ 4,000 |  |
Total purchase price |  |  | 98,634 |  |  |  |  |  |  |
Net intangible assets acquired |  |  | 2,514 |  |  |  |  |  |  |
Acquisition of goodwill |  |  | $ 20,993 |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |  |
Payments received as cash consideration |  |  |  |  |  |  |  | $ (116,521) |  |
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 |  |
Total purchase price |  |  |  |  |  |  |  |  |  | $ 5,311
Net intangible assets acquired |  |  |  |  |  |  |  |  |  | 190
Acquisition of goodwill |  |  |  |  |  |  |  |  |  | 609
Purchase price of the business assets, portion deductible |  |  |  |  |  |  |  |  |  | 5,300
Core deposit intangible amortization period |  |  |  |  |  |  |  | 10 years |  |
Payments received as cash consideration |  |  |  |  |  |  |  | $ (22,549) |  |
Performing portion of the loan portfolio acquired |  |  |  |  |  |  |  |  |  | 10,800
Estimated fair value of performing portion of the loan portfolio |  |  |  |  |  |  |  |  |  | $ 10,500
Wolverine Bancorp Inc [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange ratio per share |  |  |  |  | 1.5228% |  |  |  |  |
Cash paid for each share |  |  |  |  | $ 14.00 |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 2,129,331 |  |  |  |  |
Common stock issued |  |  |  |  | 3,241,045 |  |  |  |  |
Market closing price per share |  |  |  |  | $ 19.37 |  |  |  |  |
Estimated transaction value |  |  |  |  | $ 93,800 |  |  |  |  |
Costs related to the acquisition |  |  |  |  | 1,900 |  |  |  |  |
Total purchase price |  |  |  |  | 93,773 |  |  |  |  |
Net intangible assets acquired |  |  |  |  | 2,024 |  |  |  |  |
Acquisition of goodwill |  |  |  |  | $ 26,827 |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  | 10 years |  |  |  |
Payments received as cash consideration |  |  |  |  |  |  | (12,723) |  |  |
Lafayette Community Bancorp [Member] |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |
Exchange ratio per share | 0.8817% |  |  |  |  |  |  |  |  |
Cash paid for each share | $ 1.73 |  |  |  |  |  |  |  |  |
Common stock, shares outstanding | 1,856,679 |  |  |  |  |  |  |  |  |
Common stock issued | 1,636,888 |  |  |  |  |  |  |  |  |
Market closing price per share |  |  |  |  |  |  |  |  | $ 17.45 |
Estimated transaction value |  |  |  |  |  |  |  |  | $ 34,500 |
Costs related to the acquisition | $ 1,700 |  |  |  |  |  |  |  |  |
Total purchase price | 34,465 |  |  |  |  |  |  |  |  |
Net intangible assets acquired | 2,085 |  |  |  |  |  |  |  |  |
Acquisition of goodwill | 15,408 |  |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  |  | 10 years |  |  |  |
Gain on remeasurement of equity interest | $ 530 |  |  |  |  |  | 530 |  |  |
Payments received as cash consideration |  |  |  |  |  |  | $ (20,425) |  |  |
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 |  |  |  |  |  |  |  |
Core deposit intangible amortization period |  | 10 years |  |  |  |  |  |  |  |
Payments received as cash consideration |  | $ 11,000 |  |  |  |  |  |  |  |
Business acquisition, loans assumed |  | $ 3,400 |  |  |  |  |  |  |  |
Premium on deposits paid |  | 3.00% |  |  |  |  |  |  |  |
Business acquisition, customer deposit balances |  | $ 14,800 |  |  |  |  |  |  |  |

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