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Selected Quarterly Financial Data - Selected Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ 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
Selected Quarterly Financial Data (Unaudited) [Abstract]                            
Total interest income   $ 7,343 $ 7,151 $ 7,066 $ 7,035 $ 7,055 $ 6,911 $ 6,919 $ 6,989          
Total interest expense $ 1,026 988 959 990 883 1,005 999 1,033 1,033 $ 3,117 $ 2,832 $ 3,820 $ 4,070 $ 5,250
Net interest income 6,394 6,355 6,192 6,076 6,152 6,050 5,912 5,886 5,956 19,056 18,420 24,775 23,804 22,928
Provision for loan losses 105 105 105   105   70 120 180 315 210 315 370 196
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES 6,289 6,250 6,087 6,076 6,047 6,050 5,842 5,766 5,776 18,741 18,210 24,460 23,434 22,732
Total noninterest income 977 1,178 1,108 962 796 1,026 990 857 715 3,059 2,866 4,044 3,588 3,145
Total noninterest expense 5,662 5,380 4,669 5,217 4,811 4,638 4,385 4,598 4,229 15,915 14,697 20,077 17,850 16,870
Income before income taxes 1,604 2,048 2,526 1,821 2,032 2,438 2,447 2,025 2,262 5,885 6,379 8,427 9,172 9,007
Income taxes 261 298 544 316 404 550 529 414 499 1,129 1,264 1,562 1,992 1,979
Net income $ 1,343 $ 1,750 $ 1,982 $ 1,505 $ 1,628 $ 1,888 $ 1,918 $ 1,611 $ 1,763 $ 4,756 $ 5,115 $ 6,865 $ 7,180 $ 7,028
Net income                            
Basic (in Dollars per share) $ 0.60 $ 0.93 $ 0.96 $ 0.73 $ 0.79 $ 0.92 $ 0.94 $ 0.79 $ 0.87 $ 2.31 $ 2.49 $ 3.41 $ 3.52 $ 3.48
Diluted (in dollars per share) $ 0.60 $ 0.92 $ 0.96 $ 0.73 $ 0.78 $ 0.92 $ 0.93 $ 0.79 $ 0.86 $ 2.31 $ 2.47 $ 3.39 $ 3.50 $ 3.47
Average shares outstanding:                            
Basic (in Shares) 2,247,587 1,884,484 2,064,054 2,058,986 2,053,660 2,049,536 2,044,124 2,038,026 2,033,480 2,059,656 2,058,938 2,014,966 2,041,635 2,016,862
Diluted (in Shares) 2,256,230 1,893,345 2,072,639 2,068,313 2,062,867 2,059,561 2,052,012 2,044,564 2,039,515 2,068,532 2,068,192 2,024,120 2,049,506 2,024,040