LOANS - Troubled debt restructurings (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($) Integer	Sep. 30, 2015 USD ($) Integer
Business Activities Loans - Residential real estate
Quantity of troubled debt restructurings | Integer	3	2
Pre-modification balance	$ 683	$ 923
Post-modification balance	$ 683	$ 923
Business Activities Loans - Commercial real estate
Quantity of troubled debt restructurings | Integer	2	1
Pre-modification balance	$ 2,123	$ 294
Post-modification balance	$ 2,123	$ 294
Business Activities Loans - Home equity lines of credit
Quantity of troubled debt restructurings | Integer		1
Pre-modification balance		$ 35
Post-modification balance		$ 35
Business Activities Loans - Troubled debt restructurings
Quantity of troubled debt restructurings | Integer	6	4
Pre-modification balance	$ 2,806	$ 1,252
Post-modification balance	$ 2,806	$ 1,252
Business Activities Loans - Rate reduction and term extension
Quantity of troubled debt restructurings | Integer	1	1
Pre-modification balance	$ 174	$ 294
Post-modification balance	$ 174	$ 294
Business Activities Loans - Interest only and term extension
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Business Activities Loans - Debt consolidation
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 1,863
Post-modification balance	$ 1,863
Business Activities Loans - Debt consolidation and term extension
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 260
Post-modification balance	$ 260
Business Activities Loans - Note bifurcation
Quantity of troubled debt restructurings | Integer		1
Pre-modification balance		$ 48
Post-modification balance		$ 48
Business Activities Loans - Term extension
Quantity of troubled debt restructurings | Integer	3	2
Pre-modification balance	$ 509	$ 910
Post-modification balance	$ 509	$ 910
Acquired Loans - Residential real estate
Quantity of troubled debt restructurings | Integer	1
Pre-modification balance	$ 88
Post-modification balance	$ 88
Acquired Loans - Commercial real estate
Quantity of troubled debt restructurings | Integer		1
Pre-modification balance		$ 184
Post-modification balance		$ 184
Acquired Loans - Home equity lines of credit
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Acquired Loans - Troubled debt restructurings
Quantity of troubled debt restructurings | Integer	1	1
Pre-modification balance	$ 88	$ 184
Post-modification balance	$ 88	$ 184
Acquired Loans - Rate reduction and term extension
Quantity of troubled debt restructurings | Integer	1	1
Pre-modification balance	$ 88	$ 184
Post-modification balance	$ 88	$ 184
Acquired Loans - Interest only and term extension
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Acquired Loans - Interest only
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Acquired Loans - Debt consolidation and term extension
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance
Acquired Loans - Term extension
Quantity of troubled debt restructurings | Integer
Pre-modification balance
Post-modification balance