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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical)	12 Months Ended
	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 $ / shares shares
Statement of Stockholders' Equity [Abstract]
Cash dividends declared (in dollars per share) | $ / shares	$ 0.79	$ 0.75	$ 0.73
Treasury stock purchased (in shares)	10,899	9,603	23,072
Net shares issued to employee stock plans (in shares)	101,460	91,517	123,349
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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Number of shares of stock issued during the period pursuant to acquisitions.

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