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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share)	$ 0.86	$ 0.79	$ 0.75
Treasury stock purchased (in shares)	9,195	10,899	9,603
Net shares issued to employee stock plans (in shares)	34,944	101,460	91,517
Acquisition of Lake Sunapee Bank Group (in shares)			6,245,780

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Aggregate dividends declared during the period for each share of common stock outstanding.

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