LOANS - Narrative (Details) $ in Thousands			12 Months Ended
	Jan. 01, 2023 USD ($)	Aug. 01, 2022 USD ($)	Dec. 31, 2024 USD ($) categoryOfLoan	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2023 USD ($)	Mar. 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Categories of loans | categoryOfLoan			4
Accrued interest receivable			$ 25,800	$ 24,700
Amortized cost, PCD loans			47,100	57,800
PCD loans, estimated ACL			2,100	3,700
Total loans, other financial institutions			328,900	304,000
Loans sold to other financial institutions.			184,200	165,900
Loan purchased by other financial institutions			$ 144,700	138,100
LGD interest rate			15.00%
Threshold default percentage			1.00%
Provision for credit losses, LHFI			$ 3,758	13,750	$ 5,350
Increase (decrease) in provision for credit losses			$ (10,000)	8,400
Increase (decrease) in financing receivable, percent			(72.70%)
Initial allowance on PCD loans					3,176				$ 1,303
Provision for credit losses			$ 3,790	14,500	5,605
Loans, net			5,351,026	5,116,010	3,774,000
30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified loans receivable			2,493
Commercial financial, and agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision for credit losses, LHFI			3,213	2,164	688
Initial allowance on PCD loans					727				$ 614
Commercial financial, and agriculture | 30-59 Days Past Due
Accounts, Notes, Loans and Financing Receivable [Line Items]
Modified loans receivable			$ 40
Beach Bancorp
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business combination, acquired receivable, fair value		$ 460,000
Financing receivable, excluding accrued interest, discount (premium)		8,800
Business combination, acquired receivables, gross contractual amount		468,800
Business combination, acquired receivables, estimated uncollectible		6,400
Loans		482,903				$ 485,171
Initial allowance on PCD loans					1,300
Provision for credit losses		$ 1,300			$ 3,900
Heritage Southeast Bank
Accounts, Notes, Loans and Financing Receivable [Line Items]
Business combination, acquired receivable, fair value	$ 1,091,000
Financing receivable, excluding accrued interest, discount (premium)	33,700
Business combination, acquired receivables, gross contractual amount	1,125,000
Business combination, acquired receivables, estimated uncollectible	16,500
Provision for credit losses, LHFI				10,700
Loans	1,155,712			$ 1,155,712				$ 1,159,000
Initial allowance on PCD loans							$ 3,200
Provision for credit losses	$ 3,200