INCOME TAXES - Schedule of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current expense
Federal	$ 27,166	$ 32,738	$ (11,205)
State and local	4,804	5,153	(54)
Deferred (benefit) expense
Federal	(11,076)	(28,313)	14,215
Revaluation of deferred items	0	0	(4,899)
State and local	(1,596)	(4,292)	1,489
Tax credit investment amortization	2,606	2,702	2,486
Total	$ 21,904	$ 7,988	$ 2,032