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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2025 | Jun. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Jul. 10, 2025
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Premiums and discounts on acquired loans | $ 10,581 |  |  | $ 10,581 |  | $ 2,689 |
Net deferred origination and factoring fees | 3,424 |  |  | 3,424 |  | 3,128 |
Accrued interest on loans | $ 42,827 |  |  | $ 42,827 |  | $ 36,838 |
Purchased nonperforming credit deteriorated commercial loan |  | $ 23,411 |  |  |  |  |
Nonperforming credit deteriorated commercial loan purchase price |  | 3,284 |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration |  | 10,780 |  |  |  |  |
Discount for purchased credit deteriorated commercial loan |  | 9,348 |  |  |  |  |
Percentage of factored receivables to total loan portfolio | 96.00% |  |  | 96.00% |  | 97.00% |
Customer reserves associated with factored receivables | 28.00% |  |  | 28.00% |  | 26.00% |
Loans, net | $ 4,953,373 |  |  | $ 4,953,373 |  | $ 4,506,246 |
Pledged loans | 1,859,817 |  |  | 1,859,817 |  | 1,744,145 |
Credit loss expense (benefit) | 4,284 |  | $ 4,263 | $ 4,912 | $ 14,314 |  |
Discounted cash flow method, reasonable and supportable forecast period |  |  |  | 1 year |  |  |
Allowance for credit losses on loans, reasonable and supportable forecasts not available, historical loss information used, period |  |  |  | 2 years |  |  |
Interest earned on nonaccrual loans | 0 |  | 0 | $ 0 | 0 |  |
Commitments to lend | 69 |  |  | 69 |  |  |
Loans to borrowers experiencing financial difficulty that had payment default | 0 |  | 1,909 | 0 | 1,909 |  |
Other real estate owned, net | 210 |  |  | $ 210 |  | $ 0 |
Texas | Accounts Receivable | Geographic Concentration Risk |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of factored receivables |  |  |  | 19.00% |  | 22.00% |
Colorado | Accounts Receivable | Geographic Concentration Risk |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of factored receivables |  |  |  | 11.00% |  | 10.00% |
Illinois | Accounts Receivable | Geographic Concentration Risk |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Percentage of factored receivables |  |  |  | 11.00% |  | 12.00% |
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 |  |  |  | 45.00% |  | 48.00% |
Loans Held for Investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration | 0 |  | 0 | $ 10,780 | 0 |  |
Net charge-offs | 9,391 |  | 3,522 | 22,992 | 8,127 |  |
Credit loss expense (benefit) | 4,249 |  | 5,174 | 5,047 | 14,151 |  |
Changes In Allowance For Credit Losses |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Increase (decrease) in allowance for credit losses due to changes in projected loss drivers and prepayment assumptions | 156 |  | 531 | 442 | 2,539 |  |
Increase (decrease) in allowance for credit losses due to changes in loan volume and mix | 243 |  | (1,068) | 2,029 |  |  |
Increase (decrease) in allowance for credit losses due to increase (decrease) in specific reserves | (5,542) |  | 2,189 | (9,637) | 3,543 |  |
Factored receivables |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Customer reserves associated with factored receivables | 290,479 |  |  | 290,479 |  | $ 267,891 |
Loans, net |  |  |  |  |  | 19,361 |
Factored receivables | United States Postal Service |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans, net | 0 | $ 19,400 |  | 0 |  | 19,361 | $ 19,400
Factored receivables | Loans Held for Investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration | 0 |  | 0 | 0 | 0 |  |
Credit loss expense (benefit) | 2,310 |  | 323 | 1,181 | 3,045 |  |
1-4 family residential | Loans Held for Investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration | 0 |  | 0 | 0 | 0 |  |
Credit loss expense (benefit) | 243 |  | 15 | 442 | 71 |  |
1-4 family residential | Real Eatate Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Residential real estate loans in process of foreclosure | 0 |  |  | 0 |  | $ 0 |
Construction, land development, land | Loans Held for Investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration | 0 |  | 0 | 0 | 0 |  |
Credit loss expense (benefit) | (415) |  | 333 | (450) | 1,963 |  |
Commercial real estate | Loans Held for Investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration | 0 |  | 0 | 0 | 0 |  |
Credit loss expense (benefit) | 306 |  | (206) | 733 | (798) |  |
Commercial | Loans Held for Investment |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Initial ACL on Loans Purchased with Credit Deterioration | 0 |  | 0 | 10,780 | 0 |  |
Credit loss expense (benefit) | $ 1,724 |  | $ 4,489 | $ 2,486 | $ 9,558 |  |

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