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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - Peoples Bancorp Inc [Member] - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Business Acquisition [Line Items] |  |  |
Net Interest Income | $ 125,442 | $ 115,860 | $ 119,732
Provision for loan losses | (12) | 1,082 | 4,027
Net Interest Income after Provision for Loan Losses | 125,454 | 114,778 | 115,705
Non-interest Income | 33,959 | 43,330 | 37,976
Non-interest Expense | 109,605 | 119,522 | 112,309
Income before Income Taxes | 49,808 | 38,586 | 41,372
Income Tax Expense | 16,204 | 12,072 | 10,764
Net Income | 33,604 | 26,514 | 30,608
Net Income Available to Common Shareholders | $ 33,604 | $ 26,472 | $ 30,483
Basic Earnings Per Share | $ 1.46 | $ 1.32 | $ 1.93
Diluted Earnings Per Share | $ 1.45 | $ 1.32 | $ 1.88

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