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Loans - Loans by Class Modified as Troubled Debt Restructurings (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2015 USD ($) Loans	Dec. 31, 2014 USD ($) Loans	Dec. 31, 2013 USD ($) Loans
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	16	16
Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	1	4	3
Pre-Modification Outstanding Recorded Investment | $	$ 1,327	$ 7,194	$ 3,747
Post-Modification Outstanding Recorded Investment | $	$ 1,327	$ 7,194	$ 3,681
Commercial, Industrial, and Agricultural [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	8	7
Commercial, Industrial, and Agricultural [Member] | Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	1	1	1
Pre-Modification Outstanding Recorded Investment | $	$ 1,327	$ 2,315	$ 132
Post-Modification Outstanding Recorded Investment | $	$ 1,327	$ 2,315	$ 132
Commercial Mortgages [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	8	9
Commercial Mortgages [Member] | Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	3	2
Pre-Modification Outstanding Recorded Investment | $	$ 0	$ 4,879	$ 3,615
Post-Modification Outstanding Recorded Investment | $	$ 0	$ 4,879	$ 3,549
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	0
Residential Real Estate [Member] | Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [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
Consumer [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	0
Consumer [Member] | Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [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
Credit Cards [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans | Loans	0	0
Credit Cards [Member] | Trouble Debt Restructuring [Member]
Financing Receivable, Modifications [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=49124121&loc=SL6953676-111524

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Post-modification amount of investment in financing receivables 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=49124121&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=49124121&loc=SL6953676-111524

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