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

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- Definition Represents the total of interest and dividend income, including any amortization and accretion (as applicable) of discounts and premiums, earned from (1) loans and leases whether held-for-sale or held-in-portfolio; (2) investment securities; (3) federal funds sold; (4) securities purchased under agreements to resell; (5) investments in banker's acceptances, commercial paper, or certificates of deposit; (6) dividend income; or (7) other investments not otherwise specified herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1-5) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 1, 2 , 3, 4, 5 -Article 9 + Details
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