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v3.25.3

Other Borrowings and Subordinated Notes and Debentures - Narrative (Details) - USD ($) | 1 Months Ended | 9 Months Ended | 30 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Mar. 31, 2018 | Sep. 30, 2025 | Sep. 30, 2025 | Dec. 31, 2024 | Apr. 30, 2022
Debt Instrument [Line Items] |  |  |  |  |  |
Advances from FHLB | $ 2,700,000 |  | $ 2,700,000 | $ 2,700,000 | $ 727,900,000 |
Mortgage loans and investment securities securing FHLB advances | 6,640,000,000 |  | 6,640,000,000 | 6,640,000,000 |  |
Additional advances from FHLB | 6,130,000,000 |  | 6,130,000,000 | 6,130,000,000 |  |
Subordinated Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Face amount of debt | $ 325,000,000.0 | $ 330,000,000.0 | $ 325,000,000.0 | $ 325,000,000.0 |  |
Debt instrument, interest rate | 6.25% | 5.00% | 6.25% | 6.25% |  |
Offering price, percent | 100.00% | 100.00% | 100.00% | 100.00% |  |
Debt issuance costs incurred | $ 3,900,000 | $ 3,600,000 |  |  |  |
Debt issuance costs, net | $ 565,000 |  | $ 565,000 | $ 565,000 |  |
Subordinated Debt | Subordinated Notes Payable Due |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 6.00% |  | 6.00% | 6.00% |  |
Long-term debt, gross | $ 0 |  | $ 0 | $ 0 | $ 37,057,000 |
Subordinated Debt | Spirit of Texas Bancshares, Inc. | Subordinated Notes Payable Due |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate | 6.00% |  | 6.00% | 6.00% |  |
Long-term debt, gross |  |  |  |  |  | $ 37,400,000
Subordinated Debt | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate (as percent) |  |  |  | 2.15% |  |
Subordinated Debt | SOFR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate (as percent) | 3.02% |  |  | 0.26161% |  |
Subordinated Debt | SOFR | Subordinated Notes Payable Due |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Floating rate (as percent) |  |  | 5.92% |  |  |

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