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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (Parenthetical) - $ / shares | 12 Months Ended
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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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