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Business Combinations - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions | Mar. 10, 2016 | Feb. 04, 2016 | Mar. 09, 2016 | Feb. 03, 2016 | Dec. 31, 2015
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Kosciusko Financial Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash paid for each share to Peoples shareholder |  | $ 81.75 |  |  |
Exchange ratio per share to Peoples shareholder |  | 301.22% |  |  |
Business combination stock transferred, percentage of consideration |  | 65.00% |  |  |
Business combination cash transferred, percentage of consideration |  | 35.00% |  |  |
Market closing price per share |  |  |  | $ 23.99 |
Estimated transaction value |  |  |  | $ 22.5 |
Reported total assets of acquiree |  |  |  |  | $ 148.2
Total deposits held by acquiree |  |  |  |  | 122.8
Total loans of acquiree |  |  |  |  | 106.1
LaPorte Bancorp Inc [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash paid for each share to Peoples shareholder | $ 17.50 |  |  |  |
Exchange ratio per share to Peoples shareholder | 62.90% |  |  |  |
Business combination stock transferred, percentage of consideration | 65.00% |  |  |  |
Business combination cash transferred, percentage of consideration | 35.00% |  |  |  |
Market closing price per share |  |  | $ 24.21 |  |
Estimated transaction value |  |  | $ 94.1 |  |
Reported total assets of acquiree |  |  |  |  | 543.2
Total deposits held by acquiree |  |  |  |  | 391.0
Total loans of acquiree |  |  |  |  | $ 348.5

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