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Loans and Allowance for Credit Losses - PCD Loans (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Non-credit related discount | $ (26,400) | $ (21,500)
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) |
Fair value of PCD loans | 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) |
Fair value of PCD loans | 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) |
Fair value of PCD loans | 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 |
Fair value of PCD loans | 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) |
Fair value of PCD loans | 56 |
Landmark Bank |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 66,662 |
PCD allowance for credit loss at acquisition | (2,359) |
Non-credit related discount | (2,577) |
Fair value of PCD loans | 61,726 |
Landmark Bank | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 11,046 |
PCD allowance for credit loss at acquisition | (350) |
Non-credit related discount | (160) |
Fair value of PCD loans | 10,536 |
Landmark Bank | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 55,549 |
PCD allowance for credit loss at acquisition | (2,008) |
Non-credit related discount | (2,415) |
Fair value of PCD loans | 51,126 |
Landmark Bank | 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 |
Fair value of PCD loans | 0 |
Landmark Bank | Other Consumer and Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 67 |
PCD allowance for credit loss at acquisition | (1) |
Non-credit related discount | (2) |
Fair value of PCD loans | 64 |
Triumph |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 121,284 |
PCD allowance for credit loss at acquisition | (11,092) |
Non-credit related discount | (1,594) |
Fair value of PCD loans | 108,598 |
Triumph | Commercial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 40,466 |
PCD allowance for credit loss at acquisition | (2,999) |
Non-credit related discount | (279) |
Fair value of PCD loans | 37,188 |
Triumph | Real Estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 80,803 |
PCD allowance for credit loss at acquisition | (8,093) |
Non-credit related discount | (1,314) |
Fair value of PCD loans | 71,396 |
Triumph | 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 |
Fair value of PCD loans | 0 |
Triumph | Other Consumer and Other |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Unpaid principal balance | 15 |
PCD allowance for credit loss at acquisition | 0 |
Non-credit related discount | (1) |
Fair value of PCD loans | $ 14 |

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