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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
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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 |  |  |

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