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Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Contract	Dec. 31, 2021 USD ($) Contract
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	3	3
Pre-Modification Outstanding Recorded Investment	$ 1,370	$ 338
Post-Modification Outstanding Recorded Investment		$ 326
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
Commercial Real Estate [Member] | Commercial Real Estate - Land and Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	1
Pre-Modification Outstanding Recorded Investment	$ 84
Commercial Real Estate [Member] | Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	3
Pre-Modification Outstanding Recorded Investment	$ 1,370
Commercial Real Estate [Member] | Commercial Real Estate - Improved Property [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract	2
Pre-Modification Outstanding Recorded Investment	$ 1,286
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 103
Post-Modification Outstanding Recorded Investment		$ 100
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
Number of Modifications | Contract		1
Pre-Modification Outstanding Recorded Investment		$ 57
Post-Modification Outstanding Recorded Investment		$ 54

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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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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

+ 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 https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524

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