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Goodwill and Intangibles - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2020
Goodwill [Line Items] |  |  |  |
Net assets acquired | $ 9,440 |  |  | $ 2,922
Accumulated amortization of intangibles | 2,714 |  |  | 2,382
Amortization of intangibles | 400 | $ 143 | $ 143 |
Mortgage servicing asset | 11,400 |  |  | 7,100
Core Deposits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Net assets acquired | 7,943 |  |  | 1,410
Accumulated amortization of intangibles | 1,683 |  |  | 1,366
Loan Servicing Assets Included in Other Amortization Intangibles [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Accumulated amortization of intangibles | 277 |  |  | 209
Loan Servicing Assets Included in Interest and Fees on Loans [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Amortization of intangibles | $ 68 |  |  | $ 189
Bay Banks [Member] | Core Deposits [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Amortization of intangible assets | 10 years |  |  |
Net assets acquired | $ 6,900 |  |  |
Minimum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Amortization of intangible assets | 5 years |  |  |
Maximum [Member] |  |  |  |
Goodwill [Line Items] |  |  |  |
Amortization of intangible assets | 12 years |  |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 926 -SubTopic 20 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=120154696&loc=d3e54445-107959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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