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v3.22.2.2

Other Borrowings and Subordinated Notes and Debentures - Textual (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2018 USD ($) | Sep. 30, 2022 USD ($) issuance | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |
FHLB advances |  | $ 934,100,000 | $ 934,100,000 |  | $ 1,310,000,000
Mortgage loans and investment securities securing FHLB advances |  | 6,000,000,000 | 6,000,000,000 |  |
Additional advances from FHLB |  | $ 5,000,000,000 | 5,000,000,000 |  |
Early retirement of debt |  |  | $ (365,000) | $ 0 |
Subordinated debt |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Subordinated debentures | $ 330,000,000 |  |  |  |
Fixed rate (as percent) | 5.00% |  |  |  |
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] |  |  |  |  |
Fixed rate (as percent) |  | 6.00% | 6.00% |  |
Long-term debt, gross |  | $ 37,313,000 | $ 37,313,000 |  | $ 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] |  |  |  |  |
Fixed rate (as percent) |  | 6.00% | 6.00% |  |
Long-term debt, gross |  | $ 37,400,000 | $ 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] |  |  |  |  |
Subordinated debentures |  | $ 56,200,000 | $ 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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