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Quarterly Condensed Statements of Income (Schedule of Quarterly Condensed Statements of Income) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	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
Quarterly Financial Information Disclosure [Abstract]
Total interest and dividend income	$ 6,051us-gaap_InterestAndDividendIncomeOperating	$ 6,253us-gaap_InterestAndDividendIncomeOperating	$ 6,396us-gaap_InterestAndDividendIncomeOperating	$ 6,150us-gaap_InterestAndDividendIncomeOperating	$ 6,241us-gaap_InterestAndDividendIncomeOperating	$ 6,294us-gaap_InterestAndDividendIncomeOperating	$ 6,223us-gaap_InterestAndDividendIncomeOperating	$ 6,278us-gaap_InterestAndDividendIncomeOperating	$ 24,850us-gaap_InterestAndDividendIncomeOperating	$ 25,036us-gaap_InterestAndDividendIncomeOperating	$ 26,566us-gaap_InterestAndDividendIncomeOperating
Net interest income after provision for loan losses	5,252us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	5,773us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	6,191us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	5,372us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	6,393us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	5,667us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	5,199us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	5,192us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	22,588us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	22,451us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss	21,522us-gaap_InterestIncomeExpenseAfterProvisionForLoanLoss
Noninterest income	2,222us-gaap_NoninterestIncome	1,473us-gaap_NoninterestIncome	1,560us-gaap_NoninterestIncome	1,351us-gaap_NoninterestIncome	1,480us-gaap_NoninterestIncome	1,581us-gaap_NoninterestIncome	2,469us-gaap_NoninterestIncome	1,932us-gaap_NoninterestIncome	6,606us-gaap_NoninterestIncome	7,462us-gaap_NoninterestIncome	6,127us-gaap_NoninterestIncome
Noninterest expenses	4,844us-gaap_NoninterestExpense	5,333us-gaap_NoninterestExpense	4,966us-gaap_NoninterestExpense	4,843us-gaap_NoninterestExpense	5,660us-gaap_NoninterestExpense	5,172us-gaap_NoninterestExpense	4,952us-gaap_NoninterestExpense	4,583us-gaap_NoninterestExpense	19,986us-gaap_NoninterestExpense	20,367us-gaap_NoninterestExpense	18,540us-gaap_NoninterestExpense
Income before income taxes	2,630us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,913us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,785us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	1,880us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,213us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,076us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,716us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	2,541us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9,208us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9,546us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	9,109us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Net income	$ 2,434us-gaap_NetIncomeLoss	$ 1,385us-gaap_NetIncomeLoss	$ 1,958us-gaap_NetIncomeLoss	$ 1,363us-gaap_NetIncomeLoss	$ 1,849us-gaap_NetIncomeLoss	$ 1,505us-gaap_NetIncomeLoss	$ 2,001us-gaap_NetIncomeLoss	$ 1,803us-gaap_NetIncomeLoss	$ 7,140us-gaap_NetIncomeLoss	$ 7,158us-gaap_NetIncomeLoss	$ 6,550us-gaap_NetIncomeLoss
Net income per common share, basic (in US dollars per share)	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.57us-gaap_EarningsPerShareBasic	$ 0.40us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 0.44us-gaap_EarningsPerShareBasic	$ 0.59us-gaap_EarningsPerShareBasic	$ 0.54us-gaap_EarningsPerShareBasic	$ 2.08us-gaap_EarningsPerShareBasic	$ 2.11us-gaap_EarningsPerShareBasic	$ 1.97us-gaap_EarningsPerShareBasic
Net income per common share, diluted (in US dollars per share)	$ 0.70us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 0.54us-gaap_EarningsPerShareDiluted	$ 0.44us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.53us-gaap_EarningsPerShareDiluted	$ 2.07us-gaap_EarningsPerShareDiluted	$ 2.10us-gaap_EarningsPerShareDiluted	$ 1.96us-gaap_EarningsPerShareDiluted
Dividends per common share (in USD per share)	$ 0.20us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.19us-gaap_CommonStockDividendsPerShareDeclared	$ 0.77us-gaap_CommonStockDividendsPerShareDeclared	$ 0.76us-gaap_CommonStockDividendsPerShareDeclared	$ 0.73us-gaap_CommonStockDividendsPerShareDeclared

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Aggregate dividends declared during the period for each share of common stock outstanding.

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