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Summary of Significant Accounting Policies (Details 2) (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
Numerator: |  |  |  |  |  |  |  |  |  |  |
Net income | $ 4,443 us-gaap_NetIncomeLoss | $ 3,245 us-gaap_NetIncomeLoss | $ 4,777 us-gaap_NetIncomeLoss | $ 2,439 us-gaap_NetIncomeLoss | $ 3,224 us-gaap_NetIncomeLoss | $ 4,296 us-gaap_NetIncomeLoss | $ 4,804 us-gaap_NetIncomeLoss | $ 2,949 us-gaap_NetIncomeLoss | $ 14,904 us-gaap_NetIncomeLoss | $ 15,273 us-gaap_NetIncomeLoss | $ 17,925 us-gaap_NetIncomeLoss
Less: Net income allocated to unvested participating securities |  |  |  |  |  |  |  |  | 234 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | 135 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic | 0 us-gaap_UndistributedEarningsLossAllocatedToParticipatingSecuritiesBasic
Net income available to common stockholders |  |  |  |  |  |  |  |  | $ 14,670 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 15,138 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic | $ 17,925 us-gaap_NetIncomeLossAvailableToCommonStockholdersBasic
Denominator: |  |  |  |  |  |  |  |  |  |  |
Denominator for basic earnings per share-weighted average shares | 5,709 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,699 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,699 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,690 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,686 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,686 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,683 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,673 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,700 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,681 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic | 5,659 us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities: |  |  |  |  |  |  |  |  |  |  |
Stock options |  |  |  |  |  |  |  |  | 53 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 64 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment | 13 us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Denominator for diluted earnings per share - adjusted weighted-average shares and assumed conversions | 5,757 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,742 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,754 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,757 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,751 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,754 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,745 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,738 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,753 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,745 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding | 5,672 us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share | $ 0.77 us-gaap_EarningsPerShareBasic | $ 0.56 us-gaap_EarningsPerShareBasic | $ 0.83 us-gaap_EarningsPerShareBasic | $ 0.43 us-gaap_EarningsPerShareBasic | $ 0.56 us-gaap_EarningsPerShareBasic | $ 0.76 us-gaap_EarningsPerShareBasic | $ 0.85 us-gaap_EarningsPerShareBasic | $ 0.52 us-gaap_EarningsPerShareBasic | $ 2.57 us-gaap_EarningsPerShareBasic | $ 2.66 us-gaap_EarningsPerShareBasic | $ 3.17 us-gaap_EarningsPerShareBasic
Diluted earnings per share | $ 0.76 us-gaap_EarningsPerShareDiluted | $ 0.56 us-gaap_EarningsPerShareDiluted | $ 0.82 us-gaap_EarningsPerShareDiluted | $ 0.42 us-gaap_EarningsPerShareDiluted | $ 0.56 us-gaap_EarningsPerShareDiluted | $ 0.75 us-gaap_EarningsPerShareDiluted | $ 0.84 us-gaap_EarningsPerShareDiluted | $ 0.51 us-gaap_EarningsPerShareDiluted | $ 2.55 us-gaap_EarningsPerShareDiluted | $ 2.64 us-gaap_EarningsPerShareDiluted | $ 3.16 us-gaap_EarningsPerShareDiluted

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