Loans and the Allowance for Credit Losses - Loans Identified as TDRs (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2022 USD ($) Contract
Financing Receivable, Modifications [Line Items]
TDRs	$ 4,941
Number of Modifications \| Contract	3
Pre-Modification Outstanding Recorded Investment	$ 1,370
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
TDRs	166
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	$ 376
Number of Modifications \| Contract	3
Pre-Modification Outstanding Recorded Investment	$ 1,370
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 Real Estate - Improved Property [Member]
Financing Receivable, Modifications [Line Items]
TDRs	$ 376
Number of Modifications \| Contract	2
Pre-Modification Outstanding Recorded Investment	$ 1,286
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	3,826
Home Equity [Member]
Financing Receivable, Modifications [Line Items]
TDRs	548
Consumer [Member]
Financing Receivable, Modifications [Line Items]
TDRs	25
Accruing TDRs [Member]
Financing Receivable, Modifications [Line Items]
TDRs	3,230
Accruing TDRs [Member] \| Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
TDRs	166
Accruing TDRs [Member] \| Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	347
Accruing TDRs [Member] \| Commercial Real Estate [Member] \| Commercial Real Estate - Improved Property [Member]
Financing Receivable, Modifications [Line Items]
TDRs	347
Accruing TDRs [Member] \| Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	2,362
Accruing TDRs [Member] \| Home Equity [Member]
Financing Receivable, Modifications [Line Items]
TDRs	330
Accruing TDRs [Member] \| Consumer [Member]
Financing Receivable, Modifications [Line Items]
TDRs	25
Non-Accrual TDRs [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,711
Non-Accrual TDRs [Member] \| Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	29
Non-Accrual TDRs [Member] \| Commercial Real Estate [Member] \| Commercial Real Estate - Improved Property [Member]
Financing Receivable, Modifications [Line Items]
TDRs	29
Non-Accrual TDRs [Member] \| Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
TDRs	1,464
Non-Accrual TDRs [Member] \| Home Equity [Member]
Financing Receivable, Modifications [Line Items]
TDRs	$ 218

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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