LOANS, ALLOWANCE FOR LOAN LOSSES AND IMPAIRED LOANS - Acquired Loans Outstanding Balance and the Carrying Amount (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	$ 1,290,176	$ 1,310,963
Carrying amount	1,273,358	1,294,050
Purchased credit impaired loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	10,719	11,205
Carrying amount	10,210	10,552
Non-PCI Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	174,282	187,346
Carrying amount	171,524	184,399
Acquired Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Outstanding balance	185,001	198,551
Carrying amount	$ 181,734	$ 194,951