Loans Receivable and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
Dec. 31, 2019 USD ($) SecurityLoan	Dec. 31, 2018 USD ($) SecurityLoan
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	14	15
Pre-Modification Outstanding Recorded Investment	$ 18,044	$ 10,509
Post-Modification Outstanding Recorded Investment	$ 17,884	$ 9,165
Mortgage Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	4	6
Pre-Modification Outstanding Recorded Investment	$ 15,627	$ 981
Post-Modification Outstanding Recorded Investment	$ 15,594	$ 945
Mortgage Portfolio Segment \| Residential
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	3	6
Pre-Modification Outstanding Recorded Investment	$ 1,617	$ 981
Post-Modification Outstanding Recorded Investment	$ 1,584	$ 945
Commercial Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	6	8
Pre-Modification Outstanding Recorded Investment	$ 1,996	$ 9,192
Post-Modification Outstanding Recorded Investment	$ 1,888	$ 7,888
Commercial Portfolio Segment \| 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
Consumer Portfolio Segment
Financing Receivable, Recorded Investment [Line Items]
Number of Loans \| SecurityLoan	4	1
Pre-Modification Outstanding Recorded Investment	$ 421	$ 336
Post-Modification Outstanding Recorded Investment	$ 402	$ 332

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

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.

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

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