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Fair Value Measurements - Assets Measured on a Nonrecurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Dec. 31, 2014
Impaired loans $ 11,646 $ 13,681 $ 14,368
Other real estate owned 1,200 1,400 2,600
Estimate of Fair Value Measurement [Member]      
Impaired loans 11,102 12,848 12,772
Other real estate owned 1,205 1,412 2,590
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Nonrecurring [Member]      
Impaired loans 11,102 12,848 12,772
Other real estate owned $ 1,205 $ 1,412 $ 2,590