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Loans - Restructured in Troubled Debt (Detail) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017 USD ($) Loans	Dec. 31, 2016 USD ($) Loans
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	15	15
Loan Balance	$ 11,596	$ 11,831
Specific Reserve	$ 2,170	$ 2,339
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	7	7
Loan Balance	$ 2,595	$ 2,640
Specific Reserve	$ 123	$ 125
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	8	8
Loan Balance	$ 9,001	$ 9,191
Specific Reserve	$ 2,047	$ 2,214
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	0
Loan Balance	$ 0	$ 0
Specific Reserve	$ 0	$ 0
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	0
Loan Balance	$ 0	$ 0
Specific Reserve	$ 0	$ 0
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	0
Loan Balance	$ 0	$ 0
Specific Reserve	$ 0	$ 0

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- Definition

Financing receivable modifications specific reserve.

+ References

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- Definition

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+ References

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- Definition

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=66008989&loc=SL6953676-111524

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- Definition

The amount of the outstanding recorded investment related to 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 40
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=25495931&loc=d3e18845-111554

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Recorded Investment
-URI http://asc.fasb.org/extlink&oid=65880944

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