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Goodwill and Other Intangibles - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Jan. 31, 2021
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill | $ 26,826 |  | $ 26,826 |  | $ 19,620 | [1] |
Amortization of intangibles | 500 | $ 232 | 1,406 | $ 608 |  |  |
Mortgage servicing asset | 15,000 |  | 15,000 |  | 7,100 |  |
Loan Servicing Assets Included in Other Amortization Intangibles [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Accumulated amortization of intangibles | 258 |  | 258 |  | 209 |  |
Loan Servicing Assets Included in Interest and Fees on Loans [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amortization of intangibles |  |  | $ 131 |  | $ 189 |  |
Bay Banks [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Goodwill |  |  |  |  |  |  | $ 7,206
Bay Banks [Member] | Core Deposits [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  | 10 years |  |  |  |
Net assets acquired | $ 6,900 |  | $ 6,900 |  |  |  |
Minimum [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  | 5 years |  |  |  |
Maximum [Member] |  |  |  |  |  |  |
Goodwill [Line Items] |  |  |  |  |  |  |
Amortization of intangible assets |  |  | 12 years |  |  |  |
[1] | Derived from audited December 31, 2020 Consolidated Financial Statements.

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