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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

Mortgage servicing asset.

+ References

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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

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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

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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
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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
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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.

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