LOANS AND ALLOWANCE - Changes in Allowance for Loan Losses by Loan Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 221,147	$ 226,275	$ 223,277	$ 195,397
Provision for credit losses	5,000	0	5,000	0
CECL Day 1 non-PCD provision for credit losses				13,955
CECL Day 1 PCD ACL				16,599
Recoveries on loans	546	1,315	1,835	3,536
Loans charged off	(20,911)	(888)	(24,330)	(2,785)
Ending balance	205,782	226,702	205,782	226,702
Commercial
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	108,373	94,228	102,216	69,935
Provision for credit losses	3,020	10,142	9,460	18,518
CECL Day 1 non-PCD provision for credit losses				2,957
CECL Day 1 PCD ACL				12,970
Recoveries on loans	179	81	775	789
Loans charged off	(19,833)	(306)	(20,712)	(1,024)
Ending balance	91,739	104,145	91,739	104,145
Commercial Real Estate
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	39,157	55,328	46,839	60,665
Provision for credit losses	4,901	(7,054)	(2,833)	(21,697)
CECL Day 1 non-PCD provision for credit losses				5,539
CECL Day 1 PCD ACL				2,981
Recoveries on loans	0	188	56	1,096
Loans charged off	0	(1)	(4)	(123)
Ending balance	44,058	48,461	44,058	48,461
Construction
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	30,073	27,401	28,955	20,206
Provision for credit losses	140	186	1,258	5,862
CECL Day 1 non-PCD provision for credit losses				871
CECL Day 1 PCD ACL				648
Recoveries on loans	0	824	0	824
Loans charged off	0	0	0	0
Ending balance	30,213	28,411	30,213	28,411
Consumer & Residential
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning balance	43,544	49,318	45,267	44,591
Provision for credit losses	(3,061)	(3,274)	(2,885)	(2,683)
CECL Day 1 non-PCD provision for credit losses				4,588
CECL Day 1 PCD ACL				0
Recoveries on loans	367	222	1,004	827
Loans charged off	(1,078)	(581)	(3,614)	(1,638)
Ending balance	$ 39,772	$ 45,685	$ 39,772	$ 45,685