SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - INTANGIBLES (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Goodwill and other intangible assets
Goodwill	$ 16,300	$ 10,168	$ 10,168	$ 10,168
Core deposit intangibles
Goodwill and other intangible assets
Intangible asset	$ 1,000	$ 0