LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES - Summary of impaired loans (Details 7) (Loans receivable, USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Originated
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	$ 4,742
Impaired loans without a valuation allowance, Unpaid Principal Balance	4,763
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	1,088	3,723
Impaired loans with a valuation allowance, Unpaid Principal Balance	1,088	3,736
Impaired loans with a valuation allowance, Associated Allowance	39	145
Total impaired loans
Total impaired loans, Carrying Amount	5,830	3,723
Total impaired loans, Unpaid Principal Balance	5,851	3,736
Total impaired loans, Associated Allowance	39	145
Originated | Residential Real Estate
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	864
Impaired loans without a valuation allowance, Unpaid Principal Balance	864
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount		1,867
Impaired loans with a valuation allowance, Unpaid Principal Balance		1,880
Impaired loans with a valuation allowance, Associated Allowance		73
Originated | Commercial Real Estate
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	2,440
Impaired loans without a valuation allowance, Unpaid Principal Balance	2,455
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	455	1,117
Impaired loans with a valuation allowance, Unpaid Principal Balance	455	1,117
Impaired loans with a valuation allowance, Associated Allowance	22	56
Originated | Home equity
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	94
Impaired loans without a valuation allowance, Unpaid Principal Balance	94
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount		97
Impaired loans with a valuation allowance, Unpaid Principal Balance		97
Impaired loans with a valuation allowance, Associated Allowance		4
Originated | Commercial business
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	1,344
Impaired loans without a valuation allowance, Unpaid Principal Balance	1,350
Impaired loans with a valuation allowance:
Impaired loans with a valuation allowance, Carrying Amount	633	642
Impaired loans with a valuation allowance, Unpaid Principal Balance	633	642
Impaired loans with a valuation allowance, Associated Allowance	17	12
Acquired
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	631
Impaired loans without a valuation allowance, Unpaid Principal Balance	631
Total impaired loans
Total impaired loans, Carrying Amount	631
Total impaired loans, Unpaid Principal Balance	631
Total impaired loans, Associated Allowance
Acquired | Commercial business
Impaired loans without a valuation allowance:
Impaired loans without a valuation allowance, Carrying Amount	631
Impaired loans without a valuation allowance, Unpaid Principal Balance	$ 631