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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 03, 2017 | Jul. 18, 2016 | Jun. 01, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Nov. 07, 2016 | Sep. 30, 2016 | Aug. 31, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition of goodwill |  |  |  | $ 77,644,000 | $ 76,941,000 |  |  |
Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Exchange ratio per share |  |  | 451.83% |  |  |  |  |
Cash paid for each share |  |  | $ 81.75 |  |  |  |  |
Business combination stock transferred, percentage of consideration |  |  | 65.00% |  |  |  |  |
Business combination cash transferred, percentage of consideration |  |  | 35.00% |  |  |  |  |
Common stock issued |  |  | 873,430 |  |  |  |  |
Market closing price per share |  |  | $ 16.57 |  |  |  |  |
Estimated transaction value |  |  | $ 23,000,000 |  |  |  |  |
Costs related to the acquisition |  |  | 1,600,000 |  |  |  |  |
Acquisition of goodwill |  |  | 6,443,000 |  |  |  | $ 6,400,000 | $ 6,900,000
Net intangible assets acquired |  |  | 526,000 |  |  |  |  |
Purchase price of the business assets, portion deductible |  |  | 0 |  |  |  |  |
Core deposit intangible amortization period |  |  |  | 10 years |  |  |  |
Total estimated purchase price |  |  | $ 22,983,000 |  |  |  |  |
Kosciusko Financial Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Number of shares owned |  |  | 100 |  |  |  |  |
Share of common stock outstanding per share |  |  | $ 81.75 |  |  |  |  |
Central National Bank & Trust [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition of goodwill |  |  |  |  |  | $ 609,000 |  |
Net intangible assets acquired |  |  |  |  |  | 190,000 |  |
Purchase price of the business assets, portion deductible |  |  |  |  |  | 0 |  |
Core deposit intangible amortization period |  |  |  | 10 years |  |  |  |
Total estimated purchase price |  |  |  |  |  | 5,311,000 |  |
Performing portion of the loan portfolio acquired |  |  |  |  |  | 10,800,000 |  |
Estimated fair value of performing portion of the loan portfolio |  |  |  |  |  | $ 10,500,000 |  |
LaPorte Bancorp Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Exchange ratio per share |  | 94.35% |  |  |  |  |  |
Cash paid for each share |  | $ 17.50 |  |  |  |  |  |
Business combination stock transferred, percentage of consideration |  | 65.00% |  |  |  |  |  |
Business combination cash transferred, percentage of consideration |  | 35.00% |  |  |  |  |  |
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 |  |  |  |  |  |
Acquisition of goodwill |  | 20,993,000 |  |  |  |  |  |
Net intangible assets acquired |  | 2,514,000 |  |  |  |  |  |
Purchase price of the business assets, portion deductible |  | 0 |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  | 10 years |  |  |  |
Total estimated purchase price |  | $ 98,634,000 |  |  |  |  |  |
Goodwill adjustment |  |  |  | $ 703,000 |  |  |  |
First Farmers Bank & Trust Co [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Acquisition of goodwill | $ 0 |  |  |  |  |  |  |
Net intangible assets acquired | $ 463,000 |  |  |  |  |  |  |
Core deposit intangible amortization period | 10 years |  |  |  |  |  |  |
Payments received as cash consideration | $ 10,900,000 |  |  |  |  |  |  |
Business acquisition, loans assumed | $ 3,400,000 |  |  |  |  |  |  |
Premium on deposits paid | 3.00% |  |  |  |  |  |  |
Business acquisition, customer deposit balances | $ 14,800,000 |  |  |  |  |  |  |

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