FAIR VALUE DISCLOSURES AND REPORTING, THE FAIR VALUE OPTION AND FAIR VALUE MEASUREMENTS - Reconciliation of Activity for Assets Measured at Fair Value based on Significant Unobservable (Non-market) Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Paydowns	$ (11)	$ (55)
Purchases	0	4,189
Banks, Trust and Insurance, Equities [Member]
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, January 1	43	235
Unrealized gain included in comprehensive income	0	38
Balance at March 31	32	218
Municipal securities
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Balance, January 1	20,123	20,126
Unrealized gain included in comprehensive income	(1,630)	(26)
Maturities, calls and paydowns	(236)	(4,185)
Balance at March 31	$ 18,257	$ 20,104