BORROWINGS - Schedule of unamortized debt issuance cost (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	$ 2,962	$ 2,283
Senior notes issued in 2017 | Senior Notes
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	0	56
Subordinated notes issued in 2017 | Subordinated Debt
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	0	549
Subordinated notes issued in 2020 | Subordinated Debt
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	1,220	1,678
Subordinated notes issued in 2022 | Subordinated Debt
Junior subordinated debt owed to unconsolidated trusts
Total unamortized debt issuance costs	$ 1,742	$ 0