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Other Assets (Details) - Components of Other Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Note 8 - Other Assets (Details) - Components of Other Assets [Line Items]      
FHLB stock $ 1,887 $ 1,887 $ 1,887
Accrued interest $ 2,526 2,387 2,095
Deferred tax asset, net   959 1,484
Other   2,244 1,579
Total   7,477 7,045
Investment Securities [Member]      
Note 8 - Other Assets (Details) - Components of Other Assets [Line Items]      
Accrued interest   1,010 1,005
Loans 1 [Member]      
Note 8 - Other Assets (Details) - Components of Other Assets [Line Items]      
Accrued interest   $ 1,377 $ 1,090