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Goodwill and Other Intangibles - Changes in Carrying Amount of Goodwill (Detail) - USD ($) $ in Thousands |  | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 28, 2022 | Sep. 30, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill |  | $ 182,225 | $ 174,518 | $ 180,867
Branch acquisition | $ 7,700 | 7,707 |  |
Sale of component of business segment |  |  | (6,349) |
Commercial Banking [Member] |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill |  | 63,113 | 59,419 | 59,419
Branch acquisition |  | 3,694 |  |
Institutional Banking [Member] |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill |  | 51,332 | 51,332 | 51,332
Personal Banking [Member] |  |  |  |
Goodwill And Other Intangible Assets [Line Items] |  |  |  |
Goodwill |  | 67,780 | 63,767 | $ 70,116
Branch acquisition |  | $ 4,013 |  |
Sale of component of business segment |  |  | $ (6,349) |

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