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Loans and Allowance for Credit Losses - Narrative (Details) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) loan | Dec. 31, 2021 USD ($) loan | Dec. 31, 2020 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 16,142,124,000 | $ 16,142,124,000 | $ 12,012,503,000 |
Non-credit related discount |  | 26,400,000 | 21,500,000 |
Financing receivable, accrued interest excluded from amortized costs | 65,400,000 | 65,400,000 | 39,800,000 |
Nonaccrual loans with no allowance for credit loss | 16,900,000 | $ 16,900,000 | $ 14,500,000 |
Number of loan modifications | loan |  | 4 | 4 |
Balance Prior to TDR |  | $ 760,000 | $ 1,058,000 |
Allowance for credit losses on loans | 196,955,000 | $ 196,955,000 | $ 205,332,000 |
Number of previously restructured loans paid off | loan |  | 15 | 9 |
Restructured loans paid off |  | $ 3,169,776 | $ 1,002,874 |
Financial impact on date of restructure |  |  | 5,129 |
Number of loans with subsequent default | loan |  | 1 |  |
TDR loan, payment default |  | $ 7,800 |  |
Foreclosed assets and other real estate owned | 2,887,000 | 2,887,000 | 6,032,000 |
Financing receivable, collateral dependent, amount | 70,926,000 | 70,926,000 | 47,089,000 |
Unfunded commitments, allowance for credit loss | 41,900,000 | 41,900,000 | 22,400,000 |
Off-balance sheet, credit loss, liability, credit loss expense (reversal) | 16,000,000 | 3,500,000 |  | $ 0
Unfunded commitments | 16,000,000 | 19,453,000 | 0 | $ (10,000,000)
Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-credit related discount |  | 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 | 3,009,000 | $ 3,009,000 | 1,806,000 |
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 | 853,000 | 853,000 | 831,000 |
Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 12,581,262,000 | $ 12,581,262,000 | $ 9,167,250,000 |
Number of loan modifications | loan |  | 4 | 4 |
Balance Prior to TDR |  | $ 760,000 | $ 1,058,000 |
Financial impact on date of restructure |  | 0 | 0 |
Real Estate | Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-credit related discount |  | 998,000 |  |
Real Estate | OREO Received in Full or Partial Satisfaction of Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Balance Prior to TDR |  | 0 | 0 |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 2,837,913,000 | 2,837,913,000 | 2,160,760,000 |
Commercial | Spirit of Texas Bancshares, Inc. |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-credit related discount |  | 378,000 |  |
Single family residential | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 2,546,115,000 | $ 2,546,115,000 | $ 2,101,975,000 |
Number of loan modifications | loan |  | 4 | 3 |
Balance Prior to TDR |  | $ 760,000 | $ 274,000 |
Financial impact on date of restructure |  | 0 | 0 |
Financing receivable, collateral dependent, amount | 0 | 0 | 1,838,000 |
Other commercial | Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | 7,468,498,000 | $ 7,468,498,000 | $ 5,738,904,000 |
Number of loan modifications | loan |  | 0 | 1 |
Balance Prior to TDR |  | $ 0 | $ 784,000 |
Financial impact on date of restructure |  | 0 | 0 |
Financing receivable, collateral dependent, amount | 65,450,000 | 65,450,000 | 32,849,000 |
Paycheck Protection Program Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans | $ 8,900,000 | $ 8,900,000 | $ 116,700,000 |

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