BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands				3 Months Ended	9 Months Ended
	Sep. 30, 2023	Jan. 01, 2023	Aug. 01, 2022	Sep. 30, 2023	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
BUSINESS COMBINATIONS
Goodwill	$ 272,672			$ 272,672	$ 272,672		$ 180,254
Provision for credit loss					13,250	$ 4,900
Heritage Southeast Bank
BUSINESS COMBINATIONS
Entity shares issued per acquiree share (in shares)		0.965
Purchase price		$ 221,538
Business acquisition, equity interest issued or issuable, number of shares (in shares)		6,920,422
Cash received in lieu of fractional shares		$ 16
Goodwill		92,077
Core deposit intangible		43,739
Provision for credit loss		3,200
Business combination, acquisition related costs				312	4,500
Heritage Southeast Bank | Core Deposits
BUSINESS COMBINATIONS
Core deposit intangible		$ 43,700
Acquired finite-lived intangible assets, weighted average useful life		10 years
Beach Bancorp
BUSINESS COMBINATIONS
Entity shares issued per acquiree share (in shares)			0.1711
Purchase price	101,470		$ 101,470
Business acquisition, equity interest issued or issuable, number of shares (in shares)			3,498,936
Cash received in lieu of fractional shares			$ 1
Goodwill	23,653		21,822	23,653	23,653
Core deposit intangible	$ 9,791		9,791	9,791	9,791
Provision for credit loss			$ 1,300
Business combination, acquisition related costs				$ 78	$ 1,400
Assumed options, additional shares			310,427
Beach Bancorp | Core Deposits
BUSINESS COMBINATIONS
Acquired finite-lived intangible assets, weighted average useful life			10 years