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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($) loan	Dec. 31, 2018 USD ($) loan	Dec. 31, 2017 USD ($) loan
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	23	25
Commercial, industrial, and agricultural
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	10	10
Commercial mortgages
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	13	15
Residential real estate
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0
Consumer
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0
Credit cards
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0
Trouble Debt Restructuring
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	1	5	6
Pre-Modification Outstanding Recorded Investment | $	$ 383	$ 1,570	$ 9,171
Post-Modification Outstanding Recorded Investment | $	$ 383	$ 1,570	$ 9,171
Trouble Debt Restructuring | Commercial, industrial, and agricultural
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0	4
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 2,750
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 2,750
Trouble Debt Restructuring | Commercial mortgages
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	1	5	2
Pre-Modification Outstanding Recorded Investment | $	$ 383	$ 1,570	$ 6,421
Post-Modification Outstanding Recorded Investment | $	$ 383	$ 1,570	$ 6,421
Trouble Debt Restructuring | Residential real estate
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0	0
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Trouble Debt Restructuring | Consumer
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0	0
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Trouble Debt Restructuring | Credit cards
Schedule Of Financial Receivables [Line Items]
Number of Loans | loan	0	0	0
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0

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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

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-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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