Loans - Summary of Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) Contract	Dec. 31, 2020 USD ($) Contract	Dec. 31, 2019 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number Of Loans Restructured \| Contract	8	16	1
Pre-Modification Recorded Investment	$ 2,818	$ 1,160	$ 17
Post-Modification Recorded Investment	$ 2,818	$ 1,160	$ 17
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number Of Loans Restructured \| Contract	1	6
Pre-Modification Recorded Investment	$ 13	$ 146
Post-Modification Recorded Investment	$ 13	$ 146
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number Of Loans Restructured \| Contract	1	2
Pre-Modification Recorded Investment	$ 159	$ 189
Post-Modification Recorded Investment	$ 159	$ 189
Commercial [Member]
Financing Receivable, Modifications [Line Items]
Number Of Loans Restructured \| Contract	4	6	1
Pre-Modification Recorded Investment	$ 960	$ 648	$ 17
Post-Modification Recorded Investment	$ 960	$ 648	$ 17
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number Of Loans Restructured \| Contract	2	2
Pre-Modification Recorded Investment	$ 1,686	$ 177
Post-Modification Recorded Investment	$ 1,686	$ 177

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

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Amount, before troubled debt restructuring, of financing receivable to be modified.

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