FAIR VALUE - Loans measured at fair value under fair value option (Details) - USD ($)	Jun. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, fair value	$ 47,679,000	$ 30,620,000
Total loans, unpaid principal balance	47,007,000	29,857,000
Total loans, difference	672,000	763,000
Non-accruals, fair value	0	0
90 days or more past due, fair value	0	0
Loans Held for Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, fair value	26,202,000	30,620,000
Total loans, unpaid principal balance	25,858,000	29,857,000
Total loans, difference	344,000	$ 763,000
Loan Held for Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, fair value	21,477,000
Total loans, unpaid principal balance	21,149,000
Total loans, difference	$ 328,000