Loans - Loans by Class Modified as Troubled Debt Restructurings with Payment Default (Detail) $ in Thousands	9 Months Ended
Sep. 30, 2019 USD ($) Loan	Sep. 30, 2018 USD ($) Loan
Financing Receivable Modifications [Line Items]
Number of loans \| Loan	1	1
Recorded Investment \| $	$ 334	$ 196
Residential Mortgage Loans [Member]
Financing Receivable Modifications [Line Items]
Number of loans \| Loan	1	1
Recorded Investment \| $	$ 334	$ 196
Residential Mortgage Loans [Member] \| One-to Four-Family [Member]
Financing Receivable Modifications [Line Items]
Number of loans \| Loan	1	1
Recorded Investment \| $	$ 334	$ 196

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 34
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953682-111524

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