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v3.22.4

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, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 838,500,000 |  |
Mortgage loans and investment securities securing FHLB advances |  |  | 6,600,000,000 |  |
Additional advances from Federal Home Loan Bank |  |  | 5,400,000,000 |  |
FHLB advances outstanding |  |  | 785,000,000 |  |
Early retirement of debt |  |  | (365,000) | $ 0 | $ 0
Federal Home Loan Bank Owns the Options (FOTO) Advances |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Advances from Federal Home Loan Banks |  |  | $ 835,000,000 |  |
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 | London Interbank Offered Rate (LIBOR) |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate (as percent) | 2.15% |  |  |  |
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 |  |  | $ 37,285,000 | $ 0 |
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) | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate |  |  |  |  |
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) | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Spirit of Texas Bancshares, Inc. |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Floating rate (as percent) |  |  | 592.00% |  |
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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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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