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Related Party Transactions - Additional Information (Detail) - Directors and Executive Officers [Member] $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) SecurityLoan	Dec. 31, 2018 USD ($)
Related Party Transaction [Line Items]
Granted loans to affiliate companies	$ 1,300	$ 1,500
Subsequent advances	10,100
Payment received	10,700
Difference in related borrowings amounts	146
Ownership interest amount	$ 33,700	$ 26,100
Number of new loans approved | SecurityLoan	6

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Difference between related party deposit and loan lending amount.

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Number of new loans approved.

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Related party ownership amount in concern entity.

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- Definition

The cash outflow associated with extending a long-term loan to a related party. Alternate caption: Payments for Advances to Affiliates.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

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-Publisher FASB
-Name Accounting Standards Codification
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-Section 45
-Paragraph 13
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The cash inflow associated with collection, whether partial or full, of long-term loans to a related party. Alternate caption: Proceeds from Advances to Affiliates.

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-Publisher FASB
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-Section 45
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- Definition

Amount of transactions with related party during the financial reporting period.

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-SubTopic 10
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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