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Income Taxes (Details) - The Provision (Benefit) for Federal Income Taxes (Detail) - USD ($) $ in Thousands	3 Months Ended									9 Months Ended		12 Months Ended
	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
The Provision (Benefit) for Federal Income Taxes [Abstract]
Current payable												$ 1,004	$ 2,146	$ 1,556
Deferred										$ 224	$ 397	558	(154)	423
Actual tax expense	$ 261	$ 298	$ 544	$ 316	$ 404	$ 550	$ 529	$ 414	$ 499	$ 1,129	$ 1,264	$ 1,562	$ 1,992	$ 1,979

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- Definition

The Provision Benefit For Federal Income Taxes [Abstract]

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Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6509736

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-Publisher FASB
-Name Accounting Standards Codification
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=63044130

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