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Other Borrowings and Subordinated Notes and Debentures - Narrative (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Apr. 30, 2022 | Mar. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |
Advances from Federal Home Loan Banks | $ 853,200,000 | $ 853,200,000 | $ 953,200,000 |  |
Mortgage loans and investment securities securing FHLB advances | 7,020,000,000.00 | 7,020,000,000.00 |  |  |
Additional advances from Federal Home Loan Bank | $ 5,330,000,000 | $ 5,330,000,000 |  |  |
Subordinated Debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Face amount of debt |  |  |  |  | $ 330,000,000
Debt instrument, interest rate |  |  |  |  | 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) | 0.26161% | 0.26161% |  |  |
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% | 6.00% |  |  |
Long-term debt, gross | $ 37,142,000 | $ 37,142,000 | $ 37,171,000 |  |
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% | 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% |  |  |  |

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- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 470 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480876/942-470-45-1 + Details
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