Loans - Impaired Loans Classified as Troubled Debt Restructured (Detail) - Contract	3 Months Ended
Mar. 31, 2023	Mar. 31, 2022
Financing Receivable Modifications [Line Items]
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts	0	0

Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI https://asc.fasb.org/extlink&oid=123577603&loc=SL6953682-111524

Name:	us-gaap_FinancingReceivableModificationsSubsequentDefaultNumberOfContracts1
Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration