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Acquisitions - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jul. 01, 2015 | Mar. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Common stock, shares outstanding |  | 11,983,313 | 11,939,887
Acquisition of goodwill |  | $ 49,600,000 | $ 49,600,000
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
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 |
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 |  |
Operating revenue, net of tax |  | $ 657,000 |
Non-recurring expense, net of tax |  | $ 95,000 |
Peoples Bancorp Inc [Member] | Maximum [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Share of common stock outstanding per share | $ 33.14 |  |
Number of shares owned | 100 |  |

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