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FAIR VALUE MEASUREMENTS - Measured on Non-recurring Basis (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Assets
Other real estate owned	$ 216	$ 122
Non-recurring | Level 3
Assets
Total	20,038	15,073
Total Gains (Losses)	(4,334)
Non-recurring | Level 3 | Impaired loans
Assets
Impaired loans	15,127	10,793
Total Gains (Losses)	(4,334)
Non-recurring | Level 3 | Capitalized servicing rights
Assets
Capitalized servicing rights	4,695	4,158
Total Gains (Losses)
Non-recurring | Level 3 | Other real estate owned
Assets
Other real estate owned	216	$ 122
Total Gains (Losses)

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Carrying amount as of the balance sheet date of land and buildings obtained through foreclosure proceedings or defeasance in full or partial satisfaction of a debt arrangement.

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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

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