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Summary of Quarterly Earnings (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Schedule Of Quarterly Financial Information [Line Items]                      
Interest income $ 23,416 $ 23,621 $ 24,137 $ 23,550 $ 23,677 $ 24,348 $ 23,979 $ 24,098 $ 94,724 $ 96,102 $ 106,108
Interest expense 2,459 2,500 2,446 2,439 2,502 2,679 2,909 3,259 9,844 11,349 15,290
Net interest income 20,957 21,121 21,691 21,111 21,175 21,669 21,070 20,839 84,880 84,753 90,818
Provision for (recovery of) loan losses 500 (1,154) 722 1,187 434 381 276 1,100      
Net interest income after provision for loan losses 20,457 22,275 20,969 19,924 20,741 21,288 20,794 19,739 83,625 82,562 90,673
Noninterest income, excluding net (loss) gain on sale of securities 5,850 5,870 7,109 7,902 7,490 7,113 7,924 6,859      
Net (loss) gain on sale of securities 388 25 (79) 1 (7) (39) 213 (23) 335 144 (1,385)
Noninterest expense 16,653 18,557 18,722 18,814 19,083 19,019 20,289 17,780 72,746 76,171 82,862
Income before income taxes 10,042 9,613 9,277 9,013 9,141 9,343 8,642 8,795      
Income tax expense 3,638 3,230 3,022 2,929 2,993 3,084 2,467 2,837 12,819 11,381 12,324
Net income         6,148 6,259 6,175 5,958 25,126 24,540 25,490
Dividends on preferred stock               105   105 910
Net income available to common shareholders $ 6,404 $ 6,383 $ 6,255 $ 6,084 $ 6,148 $ 6,259 $ 6,175 $ 5,853 $ 25,126 $ 24,435 $ 24,580
Basic earnings per common share $ 0.38 $ 0.37 $ 0.36 $ 0.34 $ 0.34 $ 0.34 $ 0.33 $ 0.31 $ 1.45 $ 1.32 $ 1.34
Diluted earnings per common share 0.38 0.37 0.36 0.34 0.34 0.34 0.33 0.31 $ 1.45 $ 1.31 $ 1.31
Dividend per common share $ 0.16 $ 0.16 $ 0.14 $ 0.14 $ 0.14 $ 0.14 $ 0.13 $ 0.13      
Weighted average basic shares outstanding 16,981,010 17,031,074 17,414,320 17,859,197 18,193,824 18,470,348 18,831,742 18,633,574 17,319,689 18,531,039 18,406,363
Weighted average diluted shares outstanding 17,043,869 17,083,526 17,462,845 17,892,531 18,226,719 18,500,975 18,860,119 19,344,443 17,365,524 18,727,464 19,483,054