ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details)	12 Months Ended
	Dec. 31, 2025 USD ($) building	Dec. 31, 2024 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Debt Securities, Held To Maturity, Accrued Interest After Allowance For Credit Loss, Statement Of Financial Position Extensible List Not Disclosed Flag	accrued interest receivables
Debt Securities Available for Sale Accrued Interest After Allowance for Credit Loss Statement of Financial Position Extensible List Not Disclosed Flag	accrued interest receivables
Impairment of correspondent bank stock	$ 0	$ 0
Loans, net	2,628,982,000	2,407,235,000
Term deposits	2,746,575,000	2,514,209,000
Reciprocal Deposits
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term deposits	881,100,000
Deposit Brokers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Term deposits	$ 115,800,000
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Remaining amortization period (in years)	1 year
Minimum | Leasehold Improvements
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
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
Consumer and Other | PPP Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans, net	$ 3,200,000	$ 7,500,000
Deposits Benchmark | Customer Concentration Risk | Reciprocal Deposits
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk (as a percent)	32.10%
Deposits Benchmark | Customer Concentration Risk | Deposit Brokers
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk (as a percent)	4.20%
Deposits Benchmark | Customer Concentration Risk | 10 Largest Depositors
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk (as a percent)	36.30%
Secured by Real Estate | Loans Receivable | Collateral Concentration Risk
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Concentration risk (as a percent)	84.20%	78.90%