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Other Borrowings (Details) - Maturities of Other Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Maturities of Other Borrowings [Abstract]
2016		$ 502
2016		4.00%
2017		$ 373
2017		4.00%
2018		$ 252
2018		4.02%
2019		$ 155
2019		4.04%
2020		$ 116
2020		4.04%
Beyond 2020		$ 8,542
Beyond 2020		1.51%
Total	$ 9,713	$ 9,939	$ 10,624
Total		1.84%

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Maturities Of Other Borrowings [Abstract]

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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