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v3.23.1

Other Borrowings and Subordinated Notes and Debentures - Narrative (Details) - USD ($) | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2023 | Dec. 31, 2022
Debt Instrument [Line Items] |  |  |
Advances from Federal Home Loan Banks |  | $ 1,000,000,000 | $ 838,500,000
Mortgage loans and investment securities securing FHLB advances |  | 6,900,000,000 |
Additional advances from Federal Home Loan Bank |  | $ 5,600,000,000 |
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 | 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 |  | $ 37,256,000 | $ 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) | 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% |

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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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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI https://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI https://asc.fasb.org/extlink&oid=126734703&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 + Details
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