COMMITMENTS, CONTINGENT LIABILITIES AND RESTRICTIONS (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Commitments, Contingent Liabilities and Restrictions
Contract amount of commitments and contingencies	$ 1,390,617		$ 1,390,617		$ 1,352,781
Expense recorded for litigation accrual	(100)	$ 2,950	(100)	$ 2,950	3,000
Litigation settlement amount	2,900
Adjustment to the Company's litigation accrual	100
Minimum
Commitments, Contingent Liabilities and Restrictions
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability	0		0
Maximum
Commitments, Contingent Liabilities and Restrictions
Range of reasonably possible losses for such matters in the aggregate, beyond the existing recorded liability	1,000		1,000
Commitments to extend credit
Commitments, Contingent Liabilities and Restrictions
Contract amount of commitments and contingencies	1,357,244		1,357,244		1,313,568
Standby letters of credit
Commitments, Contingent Liabilities and Restrictions
Contract amount of commitments and contingencies	$ 33,373		$ 33,373		$ 39,213