LOANS - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Jan. 01, 2023	Dec. 31, 2022	Aug. 01, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Financing receivable, accrued interest, before allowance for credit loss	$ 21,900,000		$ 21,900,000			$ 18,000,000
Amortized cost, PCD loans	65,900,000		65,900,000			24,000,000
PCD loans, estimated ACL	3,500,000		3,500,000			1,700,000
Total TDRs						21,751,000
Additional amount committed on TDR loans						0
Allowance for TDRs						841,000
TDR period increase (decrease) in allowance		$ 0		$ 0
TDR charge-offs	0
TDR subsequent default, increase (decrease) in allowance				1,500,000
TDR subsequent default, charge-offs				0
Total loans, other financial institutions	273,000,000		273,000,000			202,600,000
Loans sold to other financial institutions.	152,800,000		152,800,000			100,100,000
Loans purchased	120,200,000		$ 120,200,000			$ 102,500,000
LGD Rate			15.00%
Threshold default percentage			1.00%
Provision for credit losses, LHFI	$ 1,000,000	$ 450,000	$ 11,500,000	$ 450,000
Heritage Southeast Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business combination, acquired receivable, fair value					$ 1,091,000,000.000
Discount (premium) on loans acquired					33,700,000
Gross contractual amounts receivable					1,125,000,000
Contractual cash flows not expected to be collected					$ 16,500,000
Provision for credit losses, LHFI			$ 10,700,000
Beach Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business combination, acquired receivable, fair value							$ 460,000,000
Discount (premium) on loans acquired							8,800,000
Gross contractual amounts receivable							468,800,000
Contractual cash flows not expected to be collected							6,400,000
TDRs acquired							$ 1,500,000