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Loans and Allowance for Credit Losses - PCD Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-credit related discount | $ (7,200) | $ (13,200)
Spirit of Texas Bancshares, Inc. |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 74,851 |
PCD allowance for credit loss at acquisition | (9,622) |
Non-credit related discount | (1,377) |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price, Total | 63,852 |
Spirit of Texas Bancshares, Inc. | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 8,258 |
PCD allowance for credit loss at acquisition | (6,433) |
Non-credit related discount | (378) |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price, Total | 1,447 |
Spirit of Texas Bancshares, Inc. | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 66,534 |
PCD allowance for credit loss at acquisition | (3,187) |
Non-credit related discount | (998) |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price, Total | 62,349 |
Spirit of Texas Bancshares, Inc. | Credit cards |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 0 |
PCD allowance for credit loss at acquisition | 0 |
Non-credit related discount | 0 |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price, Total | 0 |
Spirit of Texas Bancshares, Inc. | Other Consumer and Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 59 |
PCD allowance for credit loss at acquisition | (2) |
Non-credit related discount | (1) |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price, Total | $ 56 |

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