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Loans and Allowance for Credit Losses - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Premiums and discounts associated with acquired loans | $ 8,127 |  |  | $ 8,127 |  | $ 13,383
Net deferred origination and factoring fees | 4,324 |  |  | 4,324 |  | 3,307
Accrued interest on loans | 28,552 |  |  | 28,552 |  | 19,279
Gross loans | 4,371,528 |  |  | 4,371,528 |  | 4,120,291
Pledged loans | 1,610,699 |  |  | 1,610,699 |  | 1,356,922
Credit loss expense | 812 |  | $ 2,646 | 6,068 | $ 6,048 |
Total past due Over-Formula Advances recorded in factored receivables | 30,528 |  |  | 30,528 |  | 18,296
Interest earned on nonaccrual loans | 0 |  | 0 | 0 | 0 |
Commitments to lend | 325 |  |  | 325 |  |
Past Due 90 Days or More |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 31,623 |  |  | 31,623 |  | 41,367
Loans Held for Investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Net charge-offs | 1,206 |  | 2,465 | 14,210 | 4,204 |
Credit loss expense | 1,051 |  | 3,169 | 6,218 | 6,102 |
Changes in Allowance for Credit Losses |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Increase in allowance for credit losses due to changes in projected loss drivers and prepayment assumptions | 164 |  | 0 | 561 | 1,487 |
Increase (decrease) in allowance for credit losses due to changes in loan volume and mix | 395 |  | (520) | 179 | (2,665) |
Increase (decrease) in allowance for credit losses due to increase (decrease) in specific reserves | (714) |  | 1,278 | (8,732) | 3,077 |
Factored receivables |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Customer reserves | 219,649 |  |  | 219,649 |  | 249,288
Gross loans | 1,213,702 |  |  | 1,213,702 |  | 1,237,449
Total past due Over-Formula Advances recorded in factored receivables | 0 |  |  | 0 |  | 0
Factored receivables | Past Due 90 Days or More |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 26,346 |  |  | 26,346 |  | 37,142
Factored receivables | Over-Formula Advances |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 3,581 |  |  | 3,581 |  | 8,202
Net charge-offs |  | $ 3,330 |  |  |  |
Reimbursement for charge-off |  | $ 1,665 |  |  |  |
Factored receivables | Over-Formula Advances | Past Due 90 Days or More |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total past due Over-Formula Advances recorded in factored receivables | 3,581 |  |  | 3,581 |  | 8,202
Factored receivables | Misdirected Payments Receivable | United States Postal Service |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 19,361 |  |  | 19,361 |  | 19,361
Factored receivables | Loans Held for Investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Credit loss expense | 389 |  | 183 | 2,460 | 2,298 |
1-4 family residential |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 129,588 |  |  | 129,588 |  | 125,981
Total past due Over-Formula Advances recorded in factored receivables | 1,146 |  |  | 1,146 |  | 1,391
1-4 family residential | Past Due 90 Days or More |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Gross loans | 245 |  |  | 245 |  | 776
1-4 family residential | Loans Held for Investment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Credit loss expense | (8) |  | $ (16) | 195 | $ 268 |
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 |  | $ 129

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