ALLOWANCE FOR CREDIT LOSSES - Activity in allowance for credit losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 39,779	$ 48,305	$ 44,076
PCD ACL on acquired loans			4,410
Provision for credit losses	7,295	(2,025)	2,466
Loans charged -off	(15,496)	(15,706)	(8,216)
Recoveries	8,189	9,205	5,569
Ending Balance	39,767	39,779	48,305
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12,949	18,883	13,925
PCD ACL on acquired loans			4,410
Provision for credit losses	198	(4,079)	1,637
Loans charged -off	(966)	(3,917)	(2,158)
Recoveries	1,083	2,062	1,069
Ending Balance	13,264	12,949	18,883
Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	14,568	18,316	19,142
Provision for credit losses	(317)	(3,850)	(630)
Loans charged -off	(216)	(657)	(812)
Recoveries	292	759	616
Ending Balance	14,327	14,568	18,316
Consumer
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	12,104	10,721	11,009
Provision for credit losses	7,193	6,131	1,074
Loans charged -off	(14,314)	(11,132)	(5,246)
Recoveries	6,814	6,384	3,884
Ending Balance	11,797	12,104	10,721
Unallocated
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	158	385	0
PCD ACL on acquired loans			0
Provision for credit losses	221	(227)	385
Loans charged -off		0	0
Recoveries		0	0
Ending Balance	$ 379	$ 158	$ 385