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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Loans	Dec. 31, 2016 USD ($) Loans	Dec. 31, 2015 USD ($) Loans
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	19	15
Commercial, Industrial, and Agricultural [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	10	7
Commercial Mortgages [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	9	8
Residential Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	0	0
Consumer [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	0	0
Credit Cards [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	0	0
Trouble Debt Restructuring [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	6	1	1
Pre-Modification Outstanding Recorded Investment | $	$ 9,171	$ 109	$ 1,327
Post-Modification Outstanding Recorded Investment | $	$ 9,171	$ 109	$ 1,327
Trouble Debt Restructuring [Member] | Commercial, Industrial, and Agricultural [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	4	1	1
Pre-Modification Outstanding Recorded Investment | $	$ 2,750	$ 109	$ 1,327
Post-Modification Outstanding Recorded Investment | $	$ 2,750	$ 109	$ 1,327
Trouble Debt Restructuring [Member] | Commercial Mortgages [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	2	0	0
Pre-Modification Outstanding Recorded Investment | $	$ 6,421	$ 0	$ 0
Post-Modification Outstanding Recorded Investment | $	$ 6,421	$ 0	$ 0
Trouble Debt Restructuring [Member] | Residential Real Estate [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	0	0	0
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Trouble Debt Restructuring [Member] | Consumer [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	0	0	0
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 0	$ 0
Trouble Debt Restructuring [Member] | Credit Cards [Member]
Schedule Of Financial Receivables [Line Items]
Number of Loans | Loans	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/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

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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=84173941&loc=SL6953676-111524

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