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Selected Quarterly Financial Data (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, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Selected Quarterly Financial Data [Abstract] |  |  |  |  |  |  |
Interest and dividend income | $ 13,520 us-gaap_InvestmentIncomeInterestAndDividend | $ 13,806 us-gaap_InvestmentIncomeInterestAndDividend | $ 13,351 us-gaap_InvestmentIncomeInterestAndDividend | $ 13,041 us-gaap_InvestmentIncomeInterestAndDividend | $ 53,718 us-gaap_InvestmentIncomeInterestAndDividend | $ 50,749 us-gaap_InvestmentIncomeInterestAndDividend | $ 50,838 us-gaap_InvestmentIncomeInterestAndDividend
Interest expense | 2,507 us-gaap_InterestExpense | 2,429 us-gaap_InterestExpense | 2,487 us-gaap_InterestExpense | 2,482 us-gaap_InterestExpense | 9,905 us-gaap_InterestExpense | 11,663 us-gaap_InterestExpense | 13,867 us-gaap_InterestExpense
Net interest income | 11,013 us-gaap_InterestIncomeExpenseNet | 11,377 us-gaap_InterestIncomeExpenseNet | 10,864 us-gaap_InterestIncomeExpenseNet | 10,559 us-gaap_InterestIncomeExpenseNet | 43,813 us-gaap_InterestIncomeExpenseNet | 39,086 us-gaap_InterestIncomeExpenseNet | 36,971 us-gaap_InterestIncomeExpenseNet
Provision for loan losses | 457 us-gaap_ProvisionForLoanAndLeaseLosses | 491 us-gaap_ProvisionForLoanAndLeaseLosses | 428 us-gaap_ProvisionForLoanAndLeaseLosses | 457 us-gaap_ProvisionForLoanAndLeaseLosses | 1,833 us-gaap_ProvisionForLoanAndLeaseLosses | 1,418 us-gaap_ProvisionForLoanAndLeaseLosses | 1,652 us-gaap_ProvisionForLoanAndLeaseLosses
Non-interest income | 1,533 us-gaap_NoninterestIncome | 1,816 us-gaap_NoninterestIncome | 2,293 us-gaap_NoninterestIncome | 2,116 us-gaap_NoninterestIncome | 7,758 us-gaap_NoninterestIncome | 7,566 us-gaap_NoninterestIncome | 7,709 us-gaap_NoninterestIncome
Non-interest expense | 7,792 us-gaap_NoninterestExpense | 7,212 us-gaap_NoninterestExpense | 7,361 us-gaap_NoninterestExpense | 6,846 us-gaap_NoninterestExpense | 29,211 us-gaap_NoninterestExpense | 26,860 us-gaap_NoninterestExpense | 25,618 us-gaap_NoninterestExpense
Income before income taxes | 4,297 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,490 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,368 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 5,372 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 20,527 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 18,374 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments | 17,410 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income taxes | 1,195 us-gaap_IncomeTaxExpenseBenefit | 1,623 us-gaap_IncomeTaxExpenseBenefit | 1,511 us-gaap_IncomeTaxExpenseBenefit | 1,585 us-gaap_IncomeTaxExpenseBenefit | 5,914 us-gaap_IncomeTaxExpenseBenefit | 5,191 us-gaap_IncomeTaxExpenseBenefit | 4,944 us-gaap_IncomeTaxExpenseBenefit
Net income | $ 3,102 us-gaap_NetIncomeLoss | $ 3,867 us-gaap_NetIncomeLoss | $ 3,857 us-gaap_NetIncomeLoss | $ 3,787 us-gaap_NetIncomeLoss | $ 14,613 us-gaap_NetIncomeLoss | $ 13,183 us-gaap_NetIncomeLoss | $ 12,466 us-gaap_NetIncomeLoss
Basic earnings per share | $ 0.52 us-gaap_EarningsPerShareBasic | $ 0.65 us-gaap_EarningsPerShareBasic | $ 0.65 us-gaap_EarningsPerShareBasic | $ 0.64 us-gaap_EarningsPerShareBasic | $ 2.47 us-gaap_EarningsPerShareBasic | $ 2.24 us-gaap_EarningsPerShareBasic | $ 2.13 us-gaap_EarningsPerShareBasic
Diluted earnings per share | $ 0.52 us-gaap_EarningsPerShareDiluted | $ 0.65 us-gaap_EarningsPerShareDiluted | $ 0.65 us-gaap_EarningsPerShareDiluted | $ 0.63 us-gaap_EarningsPerShareDiluted | $ 2.45 us-gaap_EarningsPerShareDiluted | $ 2.22 us-gaap_EarningsPerShareDiluted | $ 2.12 us-gaap_EarningsPerShareDiluted

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.9) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 9 -Article 9 + Details
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- Definition Amount before accretion (amortization) of purchase discount (premium) of interest income and dividend income on nonoperating securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.7(a),(b)) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 7 -Subparagraph a, b -Article 5 + Details
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