CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common stock amount	Additional paid-in capital	Retained earnings	Accumulated other comprehensive income	Treasury stock
Balance at beginning of period at Dec. 31, 2015	$ 154,152	$ 13,577	$ 21,624	$ 122,260	$ 3,629	$ (6,938)
Comprehensive income:
Net income	4,406			4,406
Other comprehensive loss	3,436				3,436
Total comprehensive income	7,842			4,406	3,436
Cash dividends declared ($0.18 and $0.19 per share)	(1,593)			(1,593)
Treasury stock purchased	(190)					(190)
Net issuance (4,699 and 23,288) to employee stock plans, including related tax effects	236		102	(36)		170
Stock-based compensation	147		147
Balance at end of period at Mar. 31, 2016	160,594		21,873	125,037	7,065	(6,958)
Balance at beginning of period at Dec. 31, 2016	156,740	13,577	23,027	130,489	(4,326)	(6,027)
Comprehensive income:
Net income	4,211			4,211
Other comprehensive loss	664				664
Total comprehensive income	4,875			4,211	664
Cash dividends declared ($0.18 and $0.19 per share)	(2,870)			(2,870)
Acquisition of Lake Sunapee Bank Group	181,919	8,328	173,591
Net issuance (4,699 and 23,288) to employee stock plans, including related tax effects	329		130			199
Three-for-two stock split	(16)	10,952	(10,952)	(16)
Stock-based compensation	71		71
Balance at end of period at Mar. 31, 2017	$ 341,048	$ 32,857	$ 185,867	$ 131,814	$ (3,662)	$ (5,828)