INCOME TAXES - Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Current federal tax expense	$ 6,097	$ 5,288	$ 5,803
Deferred federal tax (benefit) expense	(319)	(683)	740
Revaluation of net deferred tax assets due to change in U.S. federal statutory income tax rate	0	(6)	1,695
Total	$ 5,778	$ 4,599	$ 8,238