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Fair Value - Assets and Liabilities Measured at Fair Value on Non-Recurring Basis (Detail) - Fair Value, Measurements, Non Recurring - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Commercial, industrial, and agricultural
Impaired loans:
Commercial mortgages	$ 2,910	$ 2,055
Commercial, industrial, and agricultural | Quoted Prices in Active Markets for Identical Assets (Level 1)
Impaired loans:
Commercial mortgages	0	0
Commercial, industrial, and agricultural | Significant Other Observable Inputs (Level 2)
Impaired loans:
Commercial mortgages	0	0
Commercial, industrial, and agricultural | Significant Unobservable Inputs (Level 3)
Impaired loans:
Commercial mortgages	2,910	2,055
Commercial mortgages
Impaired loans:
Commercial mortgages	1,147	679
Commercial mortgages | Quoted Prices in Active Markets for Identical Assets (Level 1)
Impaired loans:
Commercial mortgages	0	0
Commercial mortgages | Significant Other Observable Inputs (Level 2)
Impaired loans:
Commercial mortgages	0	0
Commercial mortgages | Significant Unobservable Inputs (Level 3)
Impaired loans:
Commercial mortgages	$ 1,147	$ 679

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Impaired loans.

+ References

No definition available.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258

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