FAIR VALUE - Loans measured at fair value under fair value option (Details) - USD ($)	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
90 days or more past due, fair value and still accruing	$ 0	$ 0
Total loans, fair value	35,614,000	30,620,000
Total loans, unpaid principal balance	35,603,000	29,857,000
Total loans, difference	11,000	763,000
Non-accruals, fair value	59,000	0
Non-accruals, unpaid principal balance	56,000
Non-accruals, difference	3,000
90 days or more past due, fair value	59,000
90 days or more past due, unpaid principal balance	56,000
90 days or more past due, difference	3,000
Loans Held for Sale
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, fair value	12,743,000	30,620,000
Total loans, unpaid principal balance	12,955,000	29,857,000
Total loans, difference	(212,000)	$ 763,000
Loan Held for Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total loans, fair value	22,871,000
Total loans, unpaid principal balance	22,648,000
Total loans, difference	223,000
Non-accruals, fair value	59,000
Non-accruals, unpaid principal balance	56,000
Non-accruals, difference	3,000
90 days or more past due, fair value	59,000
90 days or more past due, unpaid principal balance	56,000
90 days or more past due, difference	$ 3,000