LOANS AND ASSET QUALITY - Non-accrual loans (Details 4) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	$ 3,751	$ 3,780	$ 3,780
Transfers into non-accrual	317	375
Transfer to REO		(126)
Loans paid down/payoffs	(92)	(282)
Loans returned to accrual status	(34)	(160)
Loans charged off	(170)	(1,027)	(1,913)
Balance	3,772	2,560	3,751
Commercial and industrial
Financing Receivable Nonaccrual Status [Roll Forward]
Transfers into non-accrual
Transfer to REO
Loans paid down/payoffs
Loans returned to accrual status
Commercial real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	647	300	300
Transfers into non-accrual
Transfer to REO
Loans paid down/payoffs		(2)	(2)
Loans returned to accrual status
Loans charged off			(364)
Balance	647	298	647
Consumer and Indirect
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	456	596	596
Transfers into non-accrual	233	280
Loans paid down/payoffs	(54)	(236)
Loans returned to accrual status	(34)	(25)
Loans charged off	(167)	(163)	(695)
Balance	434	452	456
Residential real estate
Financing Receivable Nonaccrual Status [Roll Forward]
Balance	2,648	2,883	2,883
Transfers into non-accrual	84	95	95
Transfer to REO		(126)	(126)
Loans paid down/payoffs	(38)	(44)	(44)
Loans returned to accrual status		(135)	(135)
Loans charged off	(3)	(864)	(854)
Balance	$ 2,691	$ 1,809	$ 2,648