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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
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