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Summary of Quarterly Earnings (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule Of Quarterly Financial Information [Line Items]                      
Interest income $ 23,677 $ 24,348 $ 23,979 $ 24,098 $ 28,181 $ 25,751 $ 26,093 $ 26,083 $ 96,102 $ 106,108 $ 109,476
Interest expense 2,502 2,679 2,909 3,259 3,471 3,736 4,025 4,058 11,349 15,290 17,834
Net interest income 21,175 21,669 21,070 20,839 24,710 22,015 22,068 22,025 84,753 90,818 91,642
Provision for (recovery of) loan losses 434 381 276 1,100 (488) (2,439) 1,279 1,793      
Net interest income after provision for loan losses 20,741 21,288 20,794 19,739 25,198 24,454 20,789 20,232 82,562 90,673 83,434
Other income, excluding net (loss) gain on sale of securities 7,490 7,113 7,924 6,859 9,189 7,347 7,663 7,189      
Net gain (loss) on sale of securities (7) (39) 213 (23) (1,691) 320 (59) 45 144 (1,385) 399
Total noninterest expense 19,083 19,019 20,289 17,780 24,050 21,469 18,163 19,180 76,171 82,862 78,985
Income before income taxes 9,141 9,343 8,642 8,795 8,646 10,652 10,230 8,286 35,921 37,814 34,220
Income tax 2,993 3,084 2,467 2,837 2,931 3,609 3,223 2,561 11,381 12,324 10,908
Net income 6,148 6,259 6,175 5,958 5,715 7,043 7,007 5,725 24,540 25,490 23,312
Dividends on preferred stock       105 227 228 227 228 105 910 1,024
Net income available to common shareholders $ 6,148 $ 6,259 $ 6,175 $ 5,853 $ 5,488 $ 6,815 $ 6,780 $ 5,497 $ 24,435 $ 24,580 $ 22,288
Basic earnings per common share $ 0.34 $ 0.34 $ 0.33 $ 0.31 $ 0.30 $ 0.37 $ 0.37 $ 0.30 $ 1.32 $ 1.34 $ 1.13
Diluted earnings per common share 0.34 0.34 0.33 0.31 0.29 0.36 0.36 0.29 $ 1.31 $ 1.31 $ 1.11
Dividend per common share $ 0.14 $ 0.14 $ 0.13 $ 0.13 $ 0.13 $ 0.13 $ 0.12 $ 0.12      
Weighted average basic shares outstanding 18,193,824 18,470,348 18,831,742 18,633,574 18,403,959 18,402,764 18,395,996 18,423,123 18,531,039 18,406,363 19,792,099
Weighted average diluted shares outstanding 18,226,719 18,500,975 18,860,119 19,344,443 19,482,000 19,466,126 19,457,237 19,506,647 18,727,464 19,483,054 20,961,800