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Loans Receivable and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) SecurityLoan	Dec. 31, 2019 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	6	14
Pre-Modification Outstanding Recorded Investment	$ 3,149	$ 18,044
Post-Modification Outstanding Recorded Investment	$ 3,006	$ 17,884
Mortgage loans
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	4
Pre-Modification Outstanding Recorded Investment	$ 434	$ 15,627
Post-Modification Outstanding Recorded Investment	$ 360	$ 15,594
Mortgage loans | Residential
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	2	3
Pre-Modification Outstanding Recorded Investment	$ 434	$ 1,617
Post-Modification Outstanding Recorded Investment	$ 360	$ 1,584
Mortgage loans | Commercial
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan		1
Pre-Modification Outstanding Recorded Investment		$ 14,010
Post-Modification Outstanding Recorded Investment		$ 14,010
Commercial loans
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan	4	6
Pre-Modification Outstanding Recorded Investment	$ 2,715	$ 1,996
Post-Modification Outstanding Recorded Investment	$ 2,646	$ 1,888
Consumer loans
Financing Receivable, Recorded Investment [Line Items]
Number of Loans | SecurityLoan		4
Pre-Modification Outstanding Recorded Investment		$ 421
Post-Modification Outstanding Recorded Investment		$ 402

X

- Definition

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=121611835&loc=SL6953676-111524

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- Definition

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=121611835&loc=SL6953676-111524

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- Definition

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=121611835&loc=SL6953676-111524

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