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Loans and Allowance for Credit Losses - Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Apr. 08, 2022 USD ($) | Dec. 31, 2023 USD ($) loan payment | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | $ 16,845,670,000 | $ 16,142,124,000 |
Deferred origination fees, net |  | 6,700,000 | 26,400,000 |
Financing receivable, accrued interest excluded from amortized costs |  | 77,100,000 | 65,400,000 |
Nonaccrual loans with no allowance for credit loss |  | $ 3,200,000 | $ 16,900,000 |
Number of loan modifications | loan |  |  | 4 |
Number of loan modifications with payment default | loan |  | 0 |  |
Foreclosed assets and other real estate owned |  | $ 4,073,000 | $ 2,887,000 |
Financing receivable, troubled debt restructuring, premodification |  |  | 760,000 |
Financial impact on date of restructure |  |  | $ 0 |
Number of loans with subsequent default | loan |  |  | 1 |
TDR loan, payment default |  |  | $ 7,800 |
Financing receivable, collateral dependent, amount |  | 144,604,000 | 70,926,000 |
Unfunded commitments |  | (16,300,000) | 19,453,000 | $ 0
Provision for credit loss expense |  | (47,424,000) | 5,379,000 | 31,209,000
Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Deferred origination fees, net |  | $ 1,377,000 |  |
Off-balance sheet, credit loss, liability, credit loss expense (reversal) |  |  | 30,300,000 |
Minimum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, term of loan |  | 1 year |  |
Maximum |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, term of loan |  | 3 years |  |
Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans in process of foreclosure, amount |  | $ 2,500,000 | 3,000,000 |
OREO Received in Full or Partial Satisfaction of Loans | Residential Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Foreclosed assets and other real estate owned |  | 506,000 | $ 853,000 |
Loans, Excluding Acquired Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loan modifications | loan |  |  | 37 |
Provision for credit loss expense |  | (47,424,000) | $ 5,379,000 | 31,209,000
Loans, Excluding Acquired Loans | Restaurant, hospitality, student housing and office space |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Provision for credit loss expense |  |  | 16,000,000 |
Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 13,338,186,000 | $ 12,581,262,000 |
Number of loan modifications | loan |  |  | 4 |
Financing receivable, troubled debt restructuring, premodification |  |  | $ 760,000 |
Financial impact on date of restructure |  |  | 0 |
Real Estate | Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Deferred origination fees, net |  | 998,000 |  |
Real Estate | OREO Received in Full or Partial Satisfaction of Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivable, troubled debt restructuring, premodification |  |  | $ 0 |
Real Estate | Loans, Excluding Acquired Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loan modifications | loan |  |  | 36 |
Provision for credit loss expense |  | (36,381,000) | $ 34,456,000 | 7,918,000
Unfunded commitments |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Off-balance sheet, credit loss, liability, credit loss expense (reversal) |  | 16,300,000 | 16,000,000 | 0
Unfunded commitments, allowance for credit loss |  | 25,600,000 | 41,900,000 |
Unfunded commitments | Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Off-balance sheet, credit loss, liability, credit loss expense (reversal) | $ 3,500,000 |  |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | $ 2,722,886,000 | $ 2,837,913,000 |
Number of loan modifications | loan |  | 1 |  |
Number of interest only loan payments | payment |  | 2 |  |
Commercial | Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Deferred origination fees, net |  | $ 378,000 |  |
Commercial | Loans, Excluding Acquired Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Number of loan modifications | loan |  |  | 1 |
Provision for credit loss expense |  | (5,934,000) | $ (22,412,000) | $ 22,031,000
Paycheck Protection Program Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 4,800,000 | 8,900,000 |
Other commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans |  | 7,552,410,000 | 7,468,498,000 |
Charge-off |  | 9,600,000 |  |
Financing receivable, collateral dependent, amount |  | $ 76,229,000 | $ 65,450,000 |

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