FAIR VALUE DISCLOSURES - Equity Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Equity Investments
Equity investments, total	$ 12,675	$ 12,226
Federal Reserve stock
Equity Investments
Equity investments, total	9,271	9,271
FHLB stock
Equity Investments
Equity investments, total	1,194	1,189
TIB stock
Equity Investments
Equity investments, total	141	141
CRA investments
Equity Investments
Equity investments, total	$ 2,069	$ 1,625