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Loans and Allowance for Credit Losses - PCD Loans (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Non-credit related discount | $ (3,900) | $ (6,700)
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 Card |  |
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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC + Details
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