Loans - Impaired Loans Classified as Modified Loans for Borrowers Experiencing Financial Difficulty and Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2023 USD ($) Loan Contract	Dec. 31, 2022 USD ($) Contract Loan
Financing Receivable Modifications [Line Items]
Number of Contracts Modified in the Last 12 Months \| Loan	1	3
Consumer Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts Modified in the Last 12 Months \| Contract		1
Pre-Modification Outstanding Recorded Investment		$ 95
Post-Modification Outstanding Recorded Investment		$ 95
Commercial Real Estate [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts Modified in the Last 12 Months \| Contract	1	1
Pre-Modification Outstanding Recorded Investment	$ 1,024	$ 74
Post-Modification Outstanding Recorded Investment	$ 1,024	$ 74
Commercial and Industrial [Member]
Financing Receivable Modifications [Line Items]
Number of Contracts Modified in the Last 12 Months \| Contract		2
Pre-Modification Outstanding Recorded Investment		$ 1,232
Post-Modification Outstanding Recorded Investment		$ 1,232

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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