PREMISES AND EQUIPMENT - Depreciation, Rent Expense and Leasebacks (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Jun. 30, 2008
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 1,970	$ 2,110	$ 2,450
Rent expense	1,450	1,300		$ 1,320
Principal Office in South Burlington, VT
Property, Plant and Equipment [Line Items]
Deferred gain included in other liabilities	635	1,060
Deferred gains on sale leaseback transaction two periods beyond the current reporting period					$ 423
Branch Location in Burlington, VT
Property, Plant and Equipment [Line Items]
Deferred gain included in other liabilities	$ 654	$ 747
Maximum
Property, Plant and Equipment [Line Items]
Lease agreements expiring	20 years
Vermont | Principal Office in South Burlington, VT
Property, Plant and Equipment [Line Items]
Deferred gains on sale leaseback transaction after three periods beyond the current reporting period					$ 212
Vermont | Branch Location in Burlington, VT
Property, Plant and Equipment [Line Items]
Deferred gains on sale leaseback transaction two periods beyond the current reporting period			$ 93