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Summary of quarterly financial information - Summary of Quarterly Financial Information (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Selected Quarterly Financial Information [Abstract]                      
Interest income: $ 11,050 $ 8,693 $ 8,737 $ 8,890 $ 9,171 $ 9,272 $ 9,480 $ 9,668 $ 37,370 $ 37,591 $ 39,707
Interest expense 1,223 952 961 1,033 1,212 1,262 1,407 1,481 4,169 5,362 7,339
Net interest income 9,827 7,741 7,776 7,857 7,959 8,010 8,073 8,187 33,201 32,229 32,368
Provision for loan losses 1,036 525 500 300 147 471 114 192 2,361 924 2,381
Net interest income after provision for loan losses 8,791 7,216 7,276 7,557 7,812 7,539 7,959 7,995 30,840 31,305 29,987
Noninterest income 2,852 3,027 3,057 2,826 2,811 3,114 2,622 2,894 11,762 11,441 12,619
Noninterest expense 15,050 7,365 6,856 7,125 7,158 7,340 7,261 7,340 36,396 29,099 29,041
Income (loss) before income taxes (3,407) 2,878 3,477 3,258 3,465 3,313 3,320 3,549 6,206 13,647 13,565
Provision for income tax expense (benefit) (1,277) 392 633 737 757 761 721 819 485 3,058 3,034
Net income $ (2,130) $ 2,486 $ 2,844 $ 2,521 $ 2,708 $ 2,552 $ 2,599 $ 2,730 $ 5,721 $ 10,589 $ 10,531
Per share data:                      
Net income $ (0.39) $ 0.56 $ 0.64 $ 0.56 $ 0.61 $ 0.57 $ 0.58 $ 0.61      
Cash dividends declared $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.31 $ 0.30 $ 0.31 $ 0.31  
Average common shares outstanding 5,515,199 4,473,846 4,467,261 4,467,261 4,467,261 4,467,261 4,467,261 4,467,261