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Premises and Equipment (Details) - Major Classifications of Premises and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Major Classifications of Premises and Equipment [Abstract]
Land and land improvements		$ 1,943	$ 1,943
Building and leasehold improvements		11,414	11,133
Furniture, fixtures, and equipment		4,853	4,637
Property, Plant and Equipment, Gross, Total		18,210	17,713
Less accumulated depreciation and amortization		8,438	7,733
Total	$ 9,921	$ 9,772	$ 9,980

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- Definition

Major Classifications Of Premises And Equipment [Abstract]

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 50
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Amount before accumulated depreciation of building structures held for productive use including addition, improvement, or renovation to the structure, including, but not limited to, interior masonry, interior flooring, electrical, and plumbing.

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Amount before accumulated depreciation of equipment commonly used in offices and stores that have no permanent connection to the structure of a building or utilities. Examples include, but are not limited to, desks, chairs, tables, and bookcases.

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Amount before accumulated deprecation and depletion of real estate held for productive use and additions or improvements to real estate held for productive use, examples include, but are not limited to, walkways, driveways, fences, and parking lots. Excludes land held for sale.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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