Quarterly report [Sections 13 or 15(d)]

LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details)

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LOANS HELD FOR INVESTMENT AND ALLOWANCE FOR CREDIT LOSSES (Narrative) (Details)
 3 Months Ended 9 Months Ended
Sep. 30, 2026
USD ($)
Sep. 30, 2025
USD ($)
Sep. 30, 2026
USD ($)
LoanContracts
Sep. 30, 2025
USD ($)
Contracts
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses for loans HFI $ 30,369,000 $ 30,202,000 $ 30,369,000 $ 30,202,000 $ 31,007,000 $ 31,001,000 $ 29,862,000 $ 29,251,000
Provision for Credit Losses (129,000) 1,550,000 1,410,000 3,351,000        
Net loan charge-offs 509,000 1,210,000 2,042,000 2,400,000        
Change in financing receivable allowance       1,000,000.0        
Accrued interest receivable 9,400,000   $ 9,400,000     9,800,000    
Number of modified contracts | LoanContracts     0          
Amortized cost basis of loans modified during the preceding twelve months 0 2,800,000 $ 0 2,800,000        
Modified loan balance   2,500,000   2,500,000        
Net deferred costs 8,800,000   8,800,000     8,600,000    
Purchase of loans     7,013,000 958,000        
30-59 Days Past Due [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Modified loan balance   300,000   300,000        
Commercial real estate [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Purchase of loans 6,700,000 0 6,700,000 0        
Real Estate - Residential [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Allowance for credit losses for loans HFI 14,194,000 15,429,000 14,194,000 15,429,000 $ 14,877,000 15,317,000 $ 15,264,000 $ 14,568,000
Provision for Credit Losses (837,000) 164,000 (1,343,000) 733,000        
Net loan charge-offs (154,000) (1,000) (220,000) $ (128,000)        
Real estate loans for which formal foreclosure proceedings were in process $ 400,000   $ 400,000     $ 200,000    
6-month Interest Only Extension [Member]                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Financing receivable interest only extension term       6 months        
Number of modified contracts | Contracts       1        
Loan balance before modification amount   $ 2,500,000   $ 2,500,000