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Loans - Summary of Information Pertaining to Loans Modified (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) Contract	Dec. 31, 2018 USD ($) Contract
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	32	19
Pre- modification Outstanding Recorded Investment	$ 2,045	$ 14,041
Post- modification Outstanding Recorded Investment	$ 2,001	$ 12,254
One- to four-family first mortgage
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	6	8
Pre- modification Outstanding Recorded Investment	$ 932	$ 3,195
Post- modification Outstanding Recorded Investment	$ 919	$ 1,974
Home equity loans and lines
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	0	0
Pre- modification Outstanding Recorded Investment	$ 0	$ 0
Post- modification Outstanding Recorded Investment	$ 0	$ 0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	2	5
Pre- modification Outstanding Recorded Investment	$ 193	$ 10,105
Post- modification Outstanding Recorded Investment	$ 192	$ 9,603
Construction and land
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	0	0
Pre- modification Outstanding Recorded Investment	$ 0	$ 0
Post- modification Outstanding Recorded Investment	$ 0	$ 0
Multi-family residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	0	0
Pre- modification Outstanding Recorded Investment	$ 0	$ 0
Post- modification Outstanding Recorded Investment	$ 0	$ 0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	18	2
Pre- modification Outstanding Recorded Investment	$ 842	$ 697
Post- modification Outstanding Recorded Investment	$ 820	$ 635
Consumer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of Contracts | Contract	6	4
Pre- modification Outstanding Recorded Investment	$ 78	$ 44
Post- modification Outstanding Recorded Investment	$ 70	$ 42

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Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, after troubled debt restructuring, of modified financing receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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Amount, before troubled debt restructuring, of financing receivable to be modified.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953676-111524

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