ACQUISITIONS - Acquisition expenses (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Business Acquisition [Line Items]
Total mergers and acquisitions expense	$ 4,101
Salaries and employee benefits
Business Acquisition [Line Items]
Total mergers and acquisitions expense	547
Professional services
Business Acquisition [Line Items]
Total mergers and acquisitions expense	1,118
Data processing
Business Acquisition [Line Items]
Total mergers and acquisitions expense	2,428
Other.
Business Acquisition [Line Items]
Total mergers and acquisitions expense	$ 8