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Other Liabilities (Details) - Components of Other Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Components of Other Liabilities [Abstract]      
Accrued interest payable $ 391 $ 395 $ 315
Supplemental Executive Retirement Plan   1,091 828
Accrued salary expense   689 609
Other   449 368
Total   $ 2,624 $ 2,120