BUSINESS COMBINATIONS - Narrative (Details) - USD ($) $ in Thousands			3 Months Ended												12 Months Ended
	Aug. 01, 2022	Dec. 03, 2021	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
BUSINESS COMBINATIONS
Useful life of intangible assets (in years)															10 years
Goodwill			$ 180,254				$ 156,663				$ 156,944				$ 180,254	$ 156,663	$ 156,944	$ 158,572
Provision for credit losses			705	$ 4,300	$ 600	$ 0	$ (1,104)	$ 0	$ 0	$ 0	$ 3,522	$ 6,921	$ 7,606	$ 7,102	5,605	(1,104)	25,151
Bargain purchase gain															281	1,300	$ 7,835
Cadence Bank, N.A
BUSINESS COMBINATIONS
Provision for credit losses															370	370
Business combination, acquisition related costs															608	$ 1,400
Deposits		$ 410,200
Loans		40,300
Business combination, deposit premium		1,000
Bargain purchase gain		$ 1,300
Cadence Bank, N.A | Core deposit intangibles
BUSINESS COMBINATIONS
Acquired finite-lived intangible assets, weighted average useful life		10 years
Finite-lived intangible assets acquired		$ 2,900
Beach Bancorp
BUSINESS COMBINATIONS
Entity shares issued per acquiree share	0.1711
Total purchase price	$ 101,470
Business acquisition, equity interest issued or issuable (in shares)	3,498,936
Cash received in lieu of fractional shares	$ 1
Assumed options, additional shares	310,427
Goodwill	$ 23,316
Core deposit intangible	9,791
Provision for credit losses	1,300														$ 3,900
Business combination, acquisition related costs			$ 3,600
Deposits	490,591
Loans	$ 485,171
Beach Bancorp | Core deposit intangibles
BUSINESS COMBINATIONS
Acquired finite-lived intangible assets, weighted average useful life	10 years