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Acquisitions - Pro Forma Result of Comparable Prior Reporting Period (Detail) - Peoples Bancorp Inc [Member] - USD ($)
$ / shares in Units, $ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Business Acquisition [Line Items]      
Net Interest Income $ 60,466 $ 55,850 $ 75,442
Provision for Loan Losses 2,880 2,420 3,443
Net Interest Income after Provision for Loan Losses 57,586 53,430 71,999
Non-interest Income 24,545 22,458 29,928
Non-Interest Expense 61,192 55,489 74,010
Income before Income Taxes 20,939 20,399 27,917
Income Tax Expense 5,164 4,846 6,561
Net Income 15,776 15,553 21,356
Net Income Available to Common Shareholders $ 15,682 $ 15,562 $ 21,223
Per Share Data      
Net Income $ 1.33 $ 1.32 $ 1.82