Loans Receivable - Schedule of Nonaccrual Loans by Classes of the Loan Portfolio (Detail) $ in Thousands	Sep. 30, 2020 USD ($)
Schedule Of Financing Receivables Non Accrual Status [Line Items]
Nonaccrual Loans	$ 1,242
Single Family [Member]
Schedule Of Financing Receivables Non Accrual Status [Line Items]
Nonaccrual Loans	145
Non Owner Occupied [Member]
Schedule Of Financing Receivables Non Accrual Status [Line Items]
Nonaccrual Loans	$ 1,097

Amount of financing receivable on nonaccrual status.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5111-111524

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 16
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447

Name:	us-gaap_FinancingReceivableRecordedInvestmentNonaccrualStatus
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant