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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
Business Acquisition [Line Items]
Net Interest Income	$ 125,442	$ 115,860
Provision for loan losses	(12)	1,082
Net Interest Income after Provision for Loan Losses	125,454	114,778
Non-interest Income	33,959	43,330
Non-interest Expense	109,605	119,522
Income before Income Taxes	49,808	38,586
Income Tax Expense	16,204	12,072
Net Income	33,604	26,514
Net Income Available to Common Shareholders	$ 33,604	$ 26,472
Basic Earnings Per Share	$ 0.97	$ 0.88
Diluted Earnings Per Share	$ 0.97	$ 0.88

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