Related Party Transactions - Additional Information (Detail) - Management $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) SecurityLoan	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Number of related party loans not treated as impaired \| SecurityLoan	0
Maximum limit of percent of shareholders equity related party loans to identified as impaired (percent)	5.00%
Related party deposits \| $	$ 13,887	$ 15,077

Amount of deposits held by the entity for a related party (entity, shareholder, employee).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

Name:	us-gaap_RelatedPartyDepositLiabilities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant