BORROWINGS - Schedule of Subordinated Debt (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Dec. 31, 2022	Mar. 15, 2022	Nov. 05, 2019
Subordinated Borrowing [Line Items]
Long-term borrowings	$ 370,504	$ 370,205
Subordinated Debt
Subordinated Borrowing [Line Items]
Subordinated debt, gross	375,000	375,000
Less: Debt issuance costs	(4,496)	(4,795)
Subordinated Debt | Fixed Floating Rate Subordinated Notes Due 2032
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 200,000	200,000
Interest rate	3.875%		3.875%
Subordinated Debt | Fixed Floating Rate Subordinated Notes Due 2029
Subordinated Borrowing [Line Items]
Subordinated debt, gross	$ 175,000	$ 175,000
Long-term borrowings				$ 175,000
Interest rate	4.25%			4.25%