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Quarterly Financial Data - Summary of Quarterly Financial Data (Detail) (USD $) In Thousands, except 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 | Dec. 31, 2012
Summary of Income: |  |  |  |  |  |  |  |  |  |  |
Interest income | $ 8,519 us-gaap_InterestAndDividendIncomeOperating | $ 8,471 us-gaap_InterestAndDividendIncomeOperating | $ 8,304 us-gaap_InterestAndDividendIncomeOperating | $ 8,159 us-gaap_InterestAndDividendIncomeOperating | $ 8,117 us-gaap_InterestAndDividendIncomeOperating | $ 7,844 us-gaap_InterestAndDividendIncomeOperating | $ 7,765 us-gaap_InterestAndDividendIncomeOperating | $ 7,702 us-gaap_InterestAndDividendIncomeOperating | $ 33,453 us-gaap_InterestAndDividendIncomeOperating | $ 31,428 us-gaap_InterestAndDividendIncomeOperating | $ 33,273 us-gaap_InterestAndDividendIncomeOperating
Interest expense | 907 us-gaap_InterestExpense | 895 us-gaap_InterestExpense | 970 us-gaap_InterestExpense | 944 us-gaap_InterestExpense | 1,058 us-gaap_InterestExpense | 1,129 us-gaap_InterestExpense | 1,184 us-gaap_InterestExpense | 1,233 us-gaap_InterestExpense | 3,716 us-gaap_InterestExpense | 4,604 us-gaap_InterestExpense | 6,250 us-gaap_InterestExpense
Net Interest Income | 7,612 us-gaap_InterestIncomeExpenseNet | 7,576 us-gaap_InterestIncomeExpenseNet | 7,334 us-gaap_InterestIncomeExpenseNet | 7,215 us-gaap_InterestIncomeExpenseNet | 7,059 us-gaap_InterestIncomeExpenseNet | 6,715 us-gaap_InterestIncomeExpenseNet | 6,581 us-gaap_InterestIncomeExpenseNet | 6,469 us-gaap_InterestIncomeExpenseNet | 29,737 us-gaap_InterestIncomeExpenseNet | 26,824 us-gaap_InterestIncomeExpenseNet | 27,023 us-gaap_InterestIncomeExpenseNet
Provision for loan loss | 37 us-gaap_ProvisionForLoanAndLeaseLosses | 282 us-gaap_ProvisionForLoanAndLeaseLosses | 444 us-gaap_ProvisionForLoanAndLeaseLosses | 428 us-gaap_ProvisionForLoanAndLeaseLosses | 276 us-gaap_ProvisionForLoanAndLeaseLosses | 303 us-gaap_ProvisionForLoanAndLeaseLosses | 112 us-gaap_ProvisionForLoanAndLeaseLosses | 167 us-gaap_ProvisionForLoanAndLeaseLosses | 1,191 us-gaap_ProvisionForLoanAndLeaseLosses | 858 us-gaap_ProvisionForLoanAndLeaseLosses | 738 us-gaap_ProvisionForLoanAndLeaseLosses
Net interest income after provision for loan loss | 7,575 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 7,294 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,890 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,787 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,783 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,412 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,469 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 6,302 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 28,546 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 25,966 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss | 26,285 us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Other income (expense) | (3,800)us-gaap_OtherNoncashIncomeExpense | (3,818)us-gaap_OtherNoncashIncomeExpense | (3,456)us-gaap_OtherNoncashIncomeExpense | (3,955)us-gaap_OtherNoncashIncomeExpense | (3,632)us-gaap_OtherNoncashIncomeExpense | (3,555)us-gaap_OtherNoncashIncomeExpense | (2,958)us-gaap_OtherNoncashIncomeExpense | (3,218)us-gaap_OtherNoncashIncomeExpense |  |  |
Income Before Income Taxes | 3,775 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,476 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,434 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,832 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,151 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 2,857 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,511 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 3,084 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,517 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 12,603 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 13,692 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income Taxes | 1,114 us-gaap_IncomeTaxExpenseBenefit | 1,002 us-gaap_IncomeTaxExpenseBenefit | 881 us-gaap_IncomeTaxExpenseBenefit | 874 us-gaap_IncomeTaxExpenseBenefit | 864 us-gaap_IncomeTaxExpenseBenefit | 791 us-gaap_IncomeTaxExpenseBenefit | 1,009 us-gaap_IncomeTaxExpenseBenefit | 932 us-gaap_IncomeTaxExpenseBenefit | 3,871 us-gaap_IncomeTaxExpenseBenefit | 3,596 us-gaap_IncomeTaxExpenseBenefit | 3,904 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 2,661 us-gaap_NetIncomeLoss | $ 2,474 us-gaap_NetIncomeLoss | $ 2,553 us-gaap_NetIncomeLoss | $ 1,958 us-gaap_NetIncomeLoss | $ 2,287 us-gaap_NetIncomeLoss | $ 2,066 us-gaap_NetIncomeLoss | $ 2,502 us-gaap_NetIncomeLoss | $ 2,152 us-gaap_NetIncomeLoss | $ 9,646 us-gaap_NetIncomeLoss | $ 9,007 us-gaap_NetIncomeLoss | $ 9,788 us-gaap_NetIncomeLoss
Earnings per Common Share | $ 0.57 us-gaap_EarningsPerShareBasic | $ 0.54 us-gaap_EarningsPerShareBasic | $ 0.55 us-gaap_EarningsPerShareBasic | $ 0.42 us-gaap_EarningsPerShareBasic | $ 0.49 us-gaap_EarningsPerShareBasic | $ 0.45 us-gaap_EarningsPerShareBasic | $ 0.53 us-gaap_EarningsPerShareBasic | $ 0.46 us-gaap_EarningsPerShareBasic | $ 2.08 us-gaap_EarningsPerShareBasic | $ 1.93 us-gaap_EarningsPerShareBasic | $ 2.08 us-gaap_EarningsPerShareBasic
Average common shares outstanding | 4,627,338 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,621,298 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,626,309 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,637,172 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,660,096 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,682,655 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,679,971 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,683,659 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,595,967 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,645,929 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 4,665,988 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic

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