ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) building security	Dec. 31, 2021 USD ($) security
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Securities determined to be other-than-temporarily impaired | security	0	0
Impairment of correspondent bank stock	$ 0	$ 0
Performance based incentive fees	$ 0	$ 0
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining amortization period (in years)	1 year
Minimum | Leasehold improvements, including artwork
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	7 years
Minimum | Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	3 years
Minimum | Furniture/equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	3 years
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining amortization period (in years)	10 years
Maximum | Leasehold improvements, including artwork
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	15 years
Maximum | Software
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	7 years
Maximum | Furniture/equipment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	7 years
Teton Financial Services
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of buildings acquired | building	3
Teton Financial Services | Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	25 years
Teton Financial Services | Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Useful life (in years)	50 years
Real Estate | Loans Receivable | Collateral concentration risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk (as a percent)	77.90%	76.10%