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ORGANIZATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Narratives (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2023
USD ($)
building
Dec. 31, 2022
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Impairment of correspondent bank stock $ 0 $ 0
Loans, net 2,506,984 2,452,230
Performance based incentive fees 0 0
Term deposits 2,529,039 2,405,229
Reciprocal Deposits    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Term deposits 1,000,000  
Deposit Brokers    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Term deposits 165,400  
MSLP loan | COVID-19    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Loans, net 5,100 5,900
Cash, Securities, and Other | PPP Loans    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Loans, net 4,200 6,900
Consumer and Other | PPP Loans    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Loans, net $ 14,100 $ 23,400
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  
Deposits Benchmark | Customer Concentration Risk | Reciprocal Deposits    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Concentration risk (as a percent) 39.60%  
Deposits Benchmark | Customer Concentration Risk | Deposit Brokers    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Concentration risk (as a percent) 650.00%  
Deposits Benchmark | Customer Concentration Risk | 10 Largest Depositors    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Concentration risk (as a percent) 23.90%  
Real Estate | Loans Receivable | Collateral concentration risk    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Concentration risk (as a percent) 76.10% 77.90%