INCOME TAXES - Section 42 Affordable Housing (Details)	12 Months Ended
Dec. 31, 2018 USD ($) fund
Income Tax Disclosure [Abstract]
Aggregate amount of affordable housing investment	$ 3,000,000.0
Number of affordable housing investment funds \| fund	3
Gain (loss) on affordable housing investment funds	$ 0

Amount of increase (decrease) of obligation related to Affordable Housing Program (AHP) assessments required by the Federal Home Loan Bank Act of 1932.

No definition available.

Name:	us-gaap_AffordableHousingProgramObligationPeriodIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	duration