v3.26.3
LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($)
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Jun. 29, 2025
Sep. 30, 2026
Sep. 30, 2025
Jun. 30, 2025
Jun. 30, 2026
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Premiums and discounts on acquired loans   $ 7,972,000       $ 7,972,000   $ 9,300,000
Net deferred origination and factoring fees   4,709,000       4,709,000   2,530,000
Accrued interest on loans   $ 35,811,000       $ 35,811,000   $ 42,478,000
Purchased nonperforming credit deteriorated commercial loan       $ 23,411,000        
Nonperforming credit deteriorated commercial loan purchase price       3,284,000        
Initial ACL on Loans Purchased with Credit Deterioration $ 10,780,000     10,780,000        
Discount for purchased credit deteriorated commercial loan       $ 9,348,000        
Percentage of factored receivables to total loan portfolio   98.00%       98.00%   97.00%
Customer reserves associated with factored receivables   38.00%       38.00%   29.00%
Pledged loans   $ 1,581,144,000       $ 1,581,144,000   $ 1,725,914,000
Credit loss expense   5,220,000 $ 4,284,000     7,349,000 $ 4,912,000  
Discounted cash flow, credit loss expense (reversal)   $ (1,204,000)       (1,204,000)    
Financing receivable, allowance for credit losses, reasonable and supportable forecast not available, future loss information used, period   1 year            
Discounted cash flow method, reasonable and supportable forecast period   1 year     1 year      
Allowance for credit losses on loans, reasonable and supportable forecasts not available, historical loss information used, period   1 year     2 years      
Interest earned on nonaccrual loans   $ 0 0     0 0  
Commitments to lend   18,000       18,000    
Loans to borrowers experiencing financial difficulty that had payment default     0       0  
Other real estate owned, net   0       0   10,185,000
Payment Delay                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Amortized cost   0 0     0 523,000  
Loans Held for Investment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Net charge-offs   1,216,000 9,391,000     4,811,000 22,992,000  
Credit loss expense   5,028,000 4,249,000     6,895,000 5,047,000  
Changes In Allowance For Credit Losses                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Discounted cash flow, credit loss expense (reversal)   (1,204,000)       (1,204,000)    
Increase (decrease) in allowance for credit losses due to changes in projected loss drivers and prepayment assumptions   (695,000) 156,000     (4,324,000) 442,000  
Increase (decrease) in allowance for credit losses due to changes in loan volume and mix   1,368,000 243,000     4,622,000 2,029,000  
Increase (decrease) in allowance for credit losses due to increase (decrease) in specific reserves   4,343,000 (5,542,000)     2,990,000 (9,637,000)  
Factored receivables                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Customer reserves associated with factored receivables   379,363,000       379,363,000   338,496,000
Factored receivables | Loans Held for Investment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Credit loss expense   1,597,000 2,310,000     5,723,000 1,181,000  
Commercial                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans to borrowers experiencing financial difficulty that had payment default   954,000       968,000    
Commercial | Payment Delay                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Amortized cost             523,000  
Commercial | Loans Held for Investment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Credit loss expense   (828,000) 1,724,000     (3,453,000) 2,486,000  
Commercial real estate                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Loans to borrowers experiencing financial difficulty that had payment default           37,554,000    
Commercial real estate | Loans Held for Investment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Credit loss expense   3,749,000 306,000     3,900,000 733,000  
1-4 family residential | Loans Held for Investment                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Credit loss expense   828,000 $ 243,000     1,033,000 $ 442,000  
1-4 family residential | Real Eatate Loans                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Residential real estate loans in process of foreclosure   $ 1,409,000       $ 1,409,000   $ 371,000
Texas | Accounts Receivable | Geographic Concentration Risk                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of factored receivables           15.00%   20.00%
Colorado | Accounts Receivable | Geographic Concentration Risk                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of factored receivables           10.00%   10.00%
Illinois | Accounts Receivable | Geographic Concentration Risk                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of factored receivables           13.00%   10.00%
Iowa | Accounts Receivable | Geographic Concentration Risk                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of factored receivables           4.00%   4.00%
Texas, Colorado, Illinois, And Iowa | Accounts Receivable | Geographic Concentration Risk                
Accounts, Notes, Loans and Financing Receivable [Line Items]                
Percentage of factored receivables           42.00%   44.00%