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Quarterly Financial Data (Unaudited) - Schedule of Quarterly Financial Data (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |
Interest Income | $ 11,623 us-gaap_InterestAndDividendIncomeOperating | $ 11,667 us-gaap_InterestAndDividendIncomeOperating | $ 11,365 us-gaap_InterestAndDividendIncomeOperating | $ 11,315 us-gaap_InterestAndDividendIncomeOperating | $ 11,443 us-gaap_InterestAndDividendIncomeOperating | $ 11,127 us-gaap_InterestAndDividendIncomeOperating | $ 11,025 us-gaap_InterestAndDividendIncomeOperating | $ 11,286 us-gaap_InterestAndDividendIncomeOperating | $ 45,970 us-gaap_InterestAndDividendIncomeOperating | $ 44,881 us-gaap_InterestAndDividendIncomeOperating
Net interest income | 10,751 us-gaap_InterestIncomeExpenseNet | 10,684 us-gaap_InterestIncomeExpenseNet | 10,266 us-gaap_InterestIncomeExpenseNet | 10,165 us-gaap_InterestIncomeExpenseNet | 10,289 us-gaap_InterestIncomeExpenseNet | 9,917 us-gaap_InterestIncomeExpenseNet | 9,781 us-gaap_InterestIncomeExpenseNet | 9,987 us-gaap_InterestIncomeExpenseNet | 41,866 us-gaap_InterestIncomeExpenseNet | 39,974 us-gaap_InterestIncomeExpenseNet
Net income | $ 2,270 us-gaap_NetIncomeLoss | $ 2,306 us-gaap_NetIncomeLoss | $ 2,240 us-gaap_NetIncomeLoss | $ 2,712 us-gaap_NetIncomeLoss | $ 1,043 us-gaap_NetIncomeLoss | $ 1,566 us-gaap_NetIncomeLoss | $ 1,657 us-gaap_NetIncomeLoss | $ 1,913 us-gaap_NetIncomeLoss | $ 9,528 us-gaap_NetIncomeLoss | $ 6,179 us-gaap_NetIncomeLoss
Basic Earnings per Common Share | $ 0.23 us-gaap_EarningsPerShareBasic | $ 0.25 us-gaap_EarningsPerShareBasic | $ 0.24 us-gaap_EarningsPerShareBasic | $ 0.27 us-gaap_EarningsPerShareBasic | $ 0.09 us-gaap_EarningsPerShareBasic | $ 0.17 us-gaap_EarningsPerShareBasic | $ 0.18 us-gaap_EarningsPerShareBasic | $ 0.21 us-gaap_EarningsPerShareBasic | $ 0.99 us-gaap_EarningsPerShareBasic | $ 0.65 us-gaap_EarningsPerShareBasic
Diluted Earnings per Common Share | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.22 us-gaap_EarningsPerShareDiluted | $ 0.08 us-gaap_EarningsPerShareDiluted | $ 0.17 us-gaap_EarningsPerShareDiluted | $ 0.18 us-gaap_EarningsPerShareDiluted | $ 0.21 us-gaap_EarningsPerShareDiluted | $ 0.85 us-gaap_EarningsPerShareDiluted | $ 0.64 us-gaap_EarningsPerShareDiluted

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