DISCLOSURES ABOUT FAIR VALUE OF FINANCIAL INSTRUMENTS - Nonrecurring Basis (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets Measured on a Nonrecurring Basis:
Impaired loans	$ 70,431	$ 93,324
Other real estate owned	802	5,220
Other real estate owned, Losses during year	304	1,048	$ 530
Level 3
Assets Measured on a Nonrecurring Basis:
Other real estate owned	802	5,220
Nonrecurring
Assets Measured on a Nonrecurring Basis:
Impaired loans	20,066	23,613
Impaired loans, Losses during year	5,352	21,886
Other real estate owned	802	1,721
Other real estate owned, Losses during year	118	1,016
Nonrecurring | Level 3
Assets Measured on a Nonrecurring Basis:
Impaired loans	20,066	23,613
Other real estate owned	$ 802	$ 1,721