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Income Taxes (Details 1) (USD $) In Thousands, 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
Income Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before provision for income tax expense |  |  |  |  |  |  |  |  | $ 11,696 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 7,396 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | $ 3,368 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Tax at statutory federal income tax rate |  |  |  |  |  |  |  |  | 3,977 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 2,515 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate | 1,145 us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Tax-exempt income |  |  |  |  |  |  |  |  | (348)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (353)us-gaap_IncomeTaxReconciliationTaxExemptIncome | (380)us-gaap_IncomeTaxReconciliationTaxExemptIncome
State income tax, net of federal tax benefit |  |  |  |  |  |  |  |  | 385 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 233 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes | 61 us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Release of prior year over accrual |  |  |  |  |  |  |  |  | 0 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | 0 us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes | (371)us-gaap_IncomeTaxReconciliationPriorYearIncomeTaxes
Other, net |  |  |  |  |  |  |  |  | 28 us-gaap_IncomeTaxReconciliationOtherAdjustments | 27 us-gaap_IncomeTaxReconciliationOtherAdjustments | 91 us-gaap_IncomeTaxReconciliationOtherAdjustments
Total income tax expense | $ 1,074 us-gaap_IncomeTaxExpenseBenefit | $ 802 us-gaap_IncomeTaxExpenseBenefit | $ 1,121 us-gaap_IncomeTaxExpenseBenefit | $ 1,045 us-gaap_IncomeTaxExpenseBenefit | $ 903 us-gaap_IncomeTaxExpenseBenefit | $ 771 us-gaap_IncomeTaxExpenseBenefit | $ 810 us-gaap_IncomeTaxExpenseBenefit | $ (62)us-gaap_IncomeTaxExpenseBenefit | $ 4,042 us-gaap_IncomeTaxExpenseBenefit | $ 2,422 us-gaap_IncomeTaxExpenseBenefit | $ 546 us-gaap_IncomeTaxExpenseBenefit
Tax at statutory federal income tax rate (in percent) |  |  |  |  |  |  |  |  | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate | 34.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax-exempt income (in percent) |  |  |  |  |  |  |  |  | (2.98%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome | (4.77%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome | (11.27%)us-gaap_EffectiveIncomeTaxRateReconciliationTaxExemptIncome
State income tax, net of federal tax benefit (in percent) |  |  |  |  |  |  |  |  | 3.30%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 3.15%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes | 1.81%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes
Release of prior year over accrual (in percent) |  |  |  |  |  |  |  |  | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | 0.00%us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes | (11.01%)us-gaap_EffectiveIncomeTaxRateReconciliationPriorYearIncomeTaxes
Other, net (in percent) |  |  |  |  |  |  |  |  | 0.24%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 0.37%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments | 2.70%us-gaap_EffectiveIncomeTaxRateReconciliationOtherAdjustments
Provision for income tax expense (in percent) |  |  |  |  |  |  |  |  | 34.56%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 32.75%us-gaap_EffectiveIncomeTaxRateContinuingOperations | 16.23%us-gaap_EffectiveIncomeTaxRateContinuingOperations

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