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Loans and Allowance for Credit Losses - PCD Loans (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Non-credit related discount | $ (7,700) | $ (26,400)
Spirit of Texas Bancshares, Inc. |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Unpaid principal balance | 74,851 |
PCD allowance for credit loss at acquisition | (9,622) |
Non-credit related discount | (1,377) |
Fair value of PCD loans | 63,852 |
Spirit of Texas Bancshares, Inc. | Commercial |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Unpaid principal balance | 8,258 |
PCD allowance for credit loss at acquisition | (6,433) |
Non-credit related discount | (378) |
Fair value of PCD loans | 1,447 |
Spirit of Texas Bancshares, Inc. | Real Estate |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Unpaid principal balance | 66,534 |
PCD allowance for credit loss at acquisition | (3,187) |
Non-credit related discount | (998) |
Fair value of PCD loans | 62,349 |
Spirit of Texas Bancshares, Inc. | Credit cards |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Unpaid principal balance | 0 |
PCD allowance for credit loss at acquisition | 0 |
Non-credit related discount | 0 |
Fair value of PCD loans | 0 |
Spirit of Texas Bancshares, Inc. | Other Consumer and Other |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Unpaid principal balance | 59 |
PCD allowance for credit loss at acquisition | (2) |
Non-credit related discount | (1) |
Fair value of PCD loans | $ 56 |

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