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ACQUISITION - Pro Forma Information (Details) - Lake Sunapee - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Business Acquisition [Line Items]
Net interest income	$ 69,846	$ 67,670
Non-interest income	20,883	25,808
Net income	$ 26,133	$ 21,371
Pro forma earnings per share, basic (in dollars per share)	$ 1.69	$ 1.40
Pro forma earnings per share, diluted (in dollars per share)	$ 1.68	$ 1.39

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The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
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-Name Accounting Standards Codification
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