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Loans - Allowance for Loan Losses (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				$ 16,737				$ 17,373	$ 16,737	$ 17,373	$ 16,234
Charge-offs									(4,961)	(3,718)	(3,182)
Recoveries									405	522	481
Provision for loan losses	$ 2,111	$ 622	$ 220	1,196	$ 668	$ 463	$ 486	943	4,149	2,560	3,840
Allowances for loan losses, Ending Balance	16,330				16,737				16,330	16,737	17,373
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				6,035				7,114	6,035	7,114	8,212
Charge-offs									(601)	(307)	(618)
Recoveries									89	267	1
Provision for loan losses									(95)	(1,039)	(481)
Allowances for loan losses, Ending Balance	5,428				6,035				5,428	6,035	7,114
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				5,605				5,310	5,605	5,310	3,536
Charge-offs									(201)	(486)	(50)
Recoveries									8	52	210
Provision for loan losses									1,341	729	1,614
Allowances for loan losses, Ending Balance	6,753				5,605				6,753	5,605	5,310
Residential Real Estate [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				2,475				2,479	2,475	2,479	2,450
Charge-offs									(499)	(632)	(436)
Recoveries									93	8	41
Provision for loan losses									(416)	620	424
Allowances for loan losses, Ending Balance	1,653				2,475				1,653	2,475	2,479
Consumer [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				2,371				2,205	2,371	2,205	1,763
Charge-offs									(3,324)	(1,956)	(1,744)
Recoveries									122	96	93
Provision for loan losses									3,046	2,026	2,093
Allowances for loan losses, Ending Balance	2,215				2,371				2,215	2,371	2,205
Credit Cards [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				90				71	90	71	66
Charge-offs									(96)	(116)	(78)
Recoveries									22	14	25
Provision for loan losses									77	121	58
Allowances for loan losses, Ending Balance	93				90				93	90	71
Overdrafts [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Allowances for loan losses, Beginning Balance				$ 161				$ 194	161	194	207
Charge-offs									(240)	(221)	(256)
Recoveries									71	85	111
Provision for loan losses									196	103	132
Allowances for loan losses, Ending Balance	$ 188				$ 161				$ 188	$ 161	$ 194

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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+ 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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