FAIR VALUE - Securities Available for Sale Measured at Fair Value on Recurring Basis Using Significant Unobservable Inputs (Level 3) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
States and Political Subdivisions
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 64
Purchases	0
Total gains or (losses):
Included in other comprehensive income (loss)	0
Settlements	(64)
Transfers into Level 3	0
Transfers out of Level 3	0
Ending Balance	0
Corporate Notes and Bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	0
Purchases	750
Total gains or (losses):
Included in other comprehensive income (loss)	0
Settlements	0
Transfers into Level 3	1,500
Transfers out of Level 3	0	$ (1,500)
Ending Balance	$ 2,250