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Summary of Significant Accounting Policies - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jan. 01, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) Segment | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2022 USD ($) | Dec. 31, 2020 USD ($)
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Fair value adjustments on other investments |  |  | $ 110,000 | $ 9,300,000 | $ 7,300,000 |  |
Other equity investments |  |  | 12,900,000 | 23,800,000 |  |  |
Other investments |  |  | 29,467,000 | 24,672,000 |  |  |
Residential mortgage loans held for sale |  |  | 14,100,000 | 15,100,000 |  |  |
Loans held for sale |  |  | 46,337,000 | 69,534,000 |  |  |
Allowance for loan losses |  |  | $ 35,893,000 | 30,740,000 | 12,121,000 |  | $ 13,827,000
Estimated useful lives |  |  | us-gaap:UsefulLifeShorterOfTermOfLeaseOrAssetUtilityMember |  |  |  |
Lease Income |  |  | $ 0 | 0 |  |  |
Impairment of goodwill |  | $ 26,800,000 | 26,826,000 | 0 | 0 |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  | $ 185,989,000 | 248,793,000 | 277,139,000 |  | $ 108,200,000
Number of reportable business segments | Segment |  |  | 3 |  |  |  |
Retained earnings |  |  | $ 33,157,000 | 97,682,000 |  |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Par Value | $ 665,000 |  |  |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Discount (Premium) | 5,600,000 |  | 3,800,000 |  |  |  |
Financing Receivable, Purchased with Credit Deterioration, Amount at Purchase Price | 59,300,000 |  |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for loan losses |  |  |  | 7,418,000 |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  | (8,111,000) | $ 3,542,000 | $ 3,500,000 |
Retained earnings |  |  |  | (8,111,000) |  |  |
ASC 326 [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Allowance for loan losses | 38,158,000 |  | 7,400,000 |  |  |  |
Retained earnings | $ 89,571,000 |  |  |  |  |  |
Reduced stockholders' equity |  |  | 2,900,000 |  |  |  |
Fair value investments entities that calculate net asset value per share unfunded committments |  |  | 3,700,000 |  |  |  |
ASC 326 [Member] | Allowance for Credit Losses [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Reduced stockholders' equity |  |  | 5,200,000 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Asset with financial institutions |  |  | 3,000,000,000 |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Asset with financial institutions |  |  | $ 5,000,000,000 |  |  |  |
Purchased Computer Software [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 1 year |  |  |  |
Purchased Computer Software [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Building [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 39 years |  |  |  |
Building [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 40 years |  |  |  |
Furniture, Fixtures and Equipment [Member] | Minimum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 3 years |  |  |  |
Furniture, Fixtures and Equipment [Member] | Maximum [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Estimated useful lives |  |  | 15 years |  |  |  |
Special Mention [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Line Of credit facility current borrowing capacity |  |  | $ 500,000,000 |  |  |  |
Pooled Loans [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Line Of credit facility current borrowing capacity |  |  | 1,000,000,000 |  |  |  |
Fintech [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Loans held for sale |  |  | 27,700,000 | 9,800,000 |  |  |
Government Guaranteed Loans [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies [Line Items] |  |  |  |  |  |  |
Loans held for sale |  |  | $ 4,500,000 | $ 44,700,000 |  |  |

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