Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2021 USD ($) Contract	Dec. 31, 2020 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Modifications \| Contract	3	8
Pre-Modification Outstanding Recorded Investment	$ 338	$ 460
Post-Modification Outstanding Recorded Investment	$ 326	$ 443
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications \| Contract	1
Pre-Modification Outstanding Recorded Investment	$ 178
Post-Modification Outstanding Recorded Investment	$ 172
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications \| Contract	1	3
Pre-Modification Outstanding Recorded Investment	$ 103	$ 360
Post-Modification Outstanding Recorded Investment	$ 100	$ 350
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications \| Contract	1	4
Pre-Modification Outstanding Recorded Investment	$ 57	$ 93
Post-Modification Outstanding Recorded Investment	$ 54	$ 86
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications \| Contract		1
Pre-Modification Outstanding Recorded Investment		$ 7
Post-Modification Outstanding Recorded Investment		$ 7

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.

No definition available.

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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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- Definition

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

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