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Other Borrowings and Subordinated Notes and Debentures - Narrative (Details) | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 30, 2022 USD ($) issuance | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 953,200,000 | $ 838,500,000 |
Mortgage loans and investment securities securing FHLB advances |  |  | 6,940,000,000 |  |
Additional advances from Federal Home Loan Bank |  |  | 5,400,000,000 |  |
Early retirement of debt |  |  | $ 0 | (365,000) | $ 0
Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount of debt | $ 330,000,000 |  |  |  |
Debt instrument, interest rate | 5.00% |  | 5.00% |  |
Offering price, percent | 100.00% |  |  |  |
Debt issuance costs | $ 3,600,000 |  |  |  |
Subordinated Debt | LIBOR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate (as percent) | 2.15% |  |  |  |
Subordinated Debt | SOFR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate (as percent) |  |  | 0.2616% |  |
Subordinated Debt | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  | 6.00% |  |
Long-term debt, gross |  |  | $ 37,171,000 | $ 37,285,000 |
Subordinated Debt | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) | Spirit of Texas Bancshares, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Debt instrument, interest rate |  |  | 6.00% |  |
Long-term debt, gross |  |  | $ 37,400,000 |  |
Subordinated Debt | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) | SOFR |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate (as percent) |  |  | 5.92% |  |
Subordinated Debt | Subordinated notes payable, net of premium adjustments, due 7/31/2030, fixed-to-floating rate (fixed rate of 6.00% through 7/30/2025, floating rate of 5.92% above the three month SOFR rate, reset quarterly) | SOFR | Spirit of Texas Bancshares, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate (as percent) |  |  | 5.92% |  |
Trust Preferred Securities |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount of debt |  | $ 56,200,000 |  |  |
Number of issuances of trust | issuance |  | 5 |  |  |
Early retirement of debt |  | $ 365,000 |  |  |

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