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Acquisitions - Additional Information (Detail) - USD ($) |  |  |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 18, 2016 | Jun. 01, 2016 | Jul. 01, 2015 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Dec. 31, 2015 | Jul. 15, 2016
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 12,571,534 |  | 11,939,887 |
Acquisition of goodwill |  |  |  |  | $ 56,458,000 |  | $ 49,600,000 |
Subsequent Event [Member] | Pro Forma [Member] | Horizon [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Reported total assets of acquiree |  |  |  |  |  |  |  | $ 3,500,000,000
Total deposits held by acquiree |  |  |  |  |  |  |  | 2,500,000,000
Total loans of acquiree |  |  |  |  |  |  |  | $ 2,200,000,000
Kosciusko Financial Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Exchange ratio per share |  | 301.22% |  |  |  |  |  |
Common stock issued |  | 582,287 |  |  |  |  |  |
Market closing price per share |  | $ 24.85 |  |  |  |  |  |
Total estimated purchase price |  | $ 22,581,000 |  |  |  |  |  |
Costs related to the acquisition |  | 1,600,000 |  |  |  |  |  |
Loan portfolio acquired |  | 130,500,000 |  |  |  |  |  |
Discount on loan portfolio acquired |  | 6,400,000 |  |  |  |  |  |
Performing portion of the loan portfolio acquired |  | 106,200,000 |  |  |  |  |  |
Estimated fair value of performing portion of the loan portfolio |  | 104,600,000 |  |  |  |  |  |
Net intangible assets acquired |  | 1,867,000 |  |  |  |  |  |
Acquisition of goodwill |  | 6,858,000 |  |  |  |  |  |
Purchase price of the business assets, portion deductible |  | $ 0 |  |  |  |  |  |
Core deposit intangible amortization period |  |  |  |  | 7 years |  |  |
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% |  |  |  |  |  |
Estimated transaction value |  | $ 23,000,000 |  |  |  |  |  |
Reported total assets of acquiree |  | 155,413,000 |  |  |  |  |  |
Total deposits held by acquiree |  | $ 132,832,000 |  |  |  |  |  |
Kosciusko Financial Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Share of common stock outstanding per share |  | $ 81.75 |  |  |  |  |  |
Number of shares owned |  | 100 |  |  |  |  |  |
Peoples Bancorp Inc [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Exchange ratio per share |  |  | 95.00% |  |  |  |  |
Share of common stock outstanding per share |  |  | $ 9.75 |  |  |  |  |
Common stock, shares outstanding |  |  | 2,311,858 |  |  |  |  |
Common stock issued |  |  |  |  | 2,192,202 |  |  |
Market closing price per share |  |  | $ 25.32 |  |  |  |  |
Total estimated purchase price |  |  | $ 78,147,000 |  |  |  |  |
Costs related to the acquisition |  |  |  |  |  |  | $ 4,900,000 |
Loan portfolio acquired |  |  | 228,600,000 |  |  |  |  |
Discount on loan portfolio acquired |  |  | 4,800,000 |  |  |  |  |
Performing portion of the loan portfolio acquired |  |  | 223,400,000 |  |  |  |  |
Estimated fair value of performing portion of the loan portfolio |  |  | 220,000,000 |  |  |  |  |
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 |  |  |  |  | 7 years |  |  |
Operating revenue, net of tax |  |  |  | $ 657,000 |  | $ 657,000 |  |
Non-recurring expense, net of tax |  |  |  | $ 95,000 |  | $ 95,000 |  |
Reported total assets of acquiree |  |  | 485,077,000 |  |  |  |  |
Total deposits held by acquiree |  |  | $ 406,930,000 |  |  |  |  |
Peoples Bancorp Inc [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Share of common stock outstanding per share |  |  | $ 33.14 |  |  |  |  |
Number of shares owned |  |  | 100 |  |  |  |  |
LaPorte Bancorp Inc [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Exchange ratio per share | 62.90% |  |  |  |  |  |  |
Common stock issued | 2,280,992 |  |  |  |  |  |  |
Market closing price per share | $ 27.54 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |
Estimated transaction value | $ 101,700,000 |  |  |  |  |  |  |
Reported total assets of acquiree | 536,000,000 |  |  |  |  |  |  |
Total deposits held by acquiree | 370,900,000 |  |  |  |  |  |  |
Total loans of acquiree | $ 316,800,000 |  |  |  |  |  |  |
LaPorte Bancorp Inc [Member] | Maximum [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Share of common stock outstanding per share | $ 17.50 |  |  |  |  |  |  |
Number of shares owned | 100 |  |  |  |  |  |  |

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