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Segment Information, Nature of Operations, and Certain Concentrations - Interest Income (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Consolidated interest income | $ 158,774 | $ 44,311 | $ 11,879
Mortgage Banking |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Interest income | 16,687 | 11,853 | 8,725
Profit before taxes: |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Interest income | 16,687 | 11,853 | 8,725
Other unallocated interest income |  |  |
Segment Reporting, Other Significant Reconciling Item [Line Items] |  |  |
Other unallocated interest income | $ 142,087 | $ 32,458 | $ 3,154

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