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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	$ 16,330	$ 16,737
Charge-offs	(931)	(1,343)
Recoveries	131	148
Provision (benefit) for loan losses	1,016	1,196
Allowance for loan losses, March 31, 2016	16,546	16,738
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	5,428	6,035
Charge-offs	(1)	(271)
Recoveries	12	8
Provision (benefit) for loan losses	(654)	(145)
Allowance for loan losses, March 31, 2016	4,785	5,627
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	6,753	5,605
Charge-offs	0	0
Recoveries	2	5
Provision (benefit) for loan losses	602	434
Allowance for loan losses, March 31, 2016	7,357	6,044
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	1,653	2,475
Charge-offs	(68)	(25)
Recoveries	71	59
Provision (benefit) for loan losses	366	65
Allowance for loan losses, March 31, 2016	2,022	2,574
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	2,215	2,371
Charge-offs	(735)	(987)
Recoveries	2	44
Provision (benefit) for loan losses	607	846
Allowance for loan losses, March 31, 2016	2,089	2,274
Credit Cards [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	93	90
Charge-offs	(58)	(9)
Recoveries	11	12
Provision (benefit) for loan losses	59	(12)
Allowance for loan losses, March 31, 2016	105	81
Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowance for loan losses, January 1, 2016	188	161
Charge-offs	(69)	(51)
Recoveries	33	20
Provision (benefit) for loan losses	36	8
Allowance for loan losses, March 31, 2016	$ 188	$ 138

X

- Definition

A valuation allowance for financing receivables that are expected to be uncollectible.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(1)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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+ References

No definition available.

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- Definition

Amount of recovery of financing receivables doubtful of collection that were previously charged off.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(4)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

Amount of direct write-downs of financing receivables charged against the allowance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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- Definition

Amount of expense related to estimated loss from loan and lease transactions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.11)
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 11B
-Subparagraph (c)(2)
-URI http://asc.fasb.org/extlink&oid=66008989&loc=SL6953423-111524

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