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Business Combinations - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
May 19, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Business Acquisition [Line Items] |  |  |  |  |
Business combination bargain purchase gain amount |  | $ 0 | $ 0 | $ 9,696 | $ 0
Provision for loan lease and other losses |  | $ (182) | $ 200 | 2,546 | $ 200
Business combination acquired receivable allowance for credit loss | $ 2,300 |  |  |  |
Valuation adjustment of time deposits |  |  |  | $ 407 |
Maturity of time deposits |  | 5 years |  | 5 years |
Noah Bank [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of outstanding common stock acquired | 100.00% |  |  |  |
Business acquisition share price | $ 6 | $ 6 |  | $ 6 |
Business combination bargain purchase gain amount | $ 9,700 |  |  | $ 9,696 |
Business acquisition merger related expenses | 5,600 |  |  |  |
Provision for loan lease and other losses | 1,700 |  |  |  |
Fair value of investment securities from business combination | 6,500 |  |  |  |
Fair value of acquired receivable from business combination | 185,900 |  |  |  |
Business combination fair value of premises and equipment acquired | 2,500 |  |  |  |
Business combination fair value of operating lease right-of-use assets acquired | 10,500 |  |  |  |
Noah Bank [Member] | Financial Asset Acquired with Credit Deterioration [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired receivable from business combination | 37,300 |  |  |  |
Business combination acquired receivable allowance for credit loss | 537 |  |  |  |
Noah Bank [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Performing Financial Instruments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired receivable from business combination | 34,500 |  |  |  |
Noah Bank [Member] | Financial Asset Acquired with Credit Deterioration [Member] | Nonperforming Financial Instruments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Fair value of acquired receivable from business combination | 2,600 |  |  |  |
Noah Bank [Member] | Termination Of Branch Lease [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | 2,500 |  |  |  |
Noah Bank [Member] | Termination Of Data Processing [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | 1,700 |  |  |  |
Noah Bank [Member] | Legal Expense [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | 287 |  |  |  |
Noah Bank [Member] | Investment Banker Services [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | 243 |  |  |  |
Noah Bank [Member] | Severance Payments [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | 184 |  |  |  |
Noah Bank [Member] | Professional Services [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | 115 |  |  |  |
Noah Bank [Member] | Other Miscellaneous Expenses [Member] |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Business acquisition merger related expenses | $ 619 |  |  |  |

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