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Net Income per Common Share (Details) (USD $)
 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, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Earnings Per Share [Abstract]                              
Net income $ 2,566,000us-gaap_NetIncomeLoss $ 2,428,000us-gaap_NetIncomeLoss $ 2,520,000us-gaap_NetIncomeLoss $ 2,120,000us-gaap_NetIncomeLoss $ 1,636,000us-gaap_NetIncomeLoss $ 1,960,000us-gaap_NetIncomeLoss $ 1,589,000us-gaap_NetIncomeLoss $ 1,681,000us-gaap_NetIncomeLoss $ 2,063,000us-gaap_NetIncomeLoss $ 1,151,000us-gaap_NetIncomeLoss $ 2,341,000us-gaap_NetIncomeLoss $ 2,635,000us-gaap_NetIncomeLoss $ 9,634,000us-gaap_NetIncomeLoss $ 6,866,000us-gaap_NetIncomeLoss $ 8,190,000us-gaap_NetIncomeLoss
Weighted average common shares outstanding — basic                         7,508,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,220,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 7,104,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities (in shares)                         45,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 215,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment 275,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Weighted average common and potentially issuable common shares outstanding — diluted (in shares)                         7,553,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,435,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 7,379,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic net income per common share (USD per share) $ 0.34us-gaap_EarningsPerShareBasic $ 0.32us-gaap_EarningsPerShareBasic $ 0.34us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.27us-gaap_EarningsPerShareBasic $ 0.22us-gaap_EarningsPerShareBasic $ 0.24us-gaap_EarningsPerShareBasic $ 0.29us-gaap_EarningsPerShareBasic $ 0.16us-gaap_EarningsPerShareBasic $ 0.33us-gaap_EarningsPerShareBasic $ 0.37us-gaap_EarningsPerShareBasic $ 1.28us-gaap_EarningsPerShareBasic $ 0.95us-gaap_EarningsPerShareBasic $ 1.15us-gaap_EarningsPerShareBasic
Diluted net income per common share (USD per share) $ 0.34us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.33us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.22us-gaap_EarningsPerShareDiluted $ 0.26us-gaap_EarningsPerShareDiluted $ 0.21us-gaap_EarningsPerShareDiluted $ 0.23us-gaap_EarningsPerShareDiluted $ 0.28us-gaap_EarningsPerShareDiluted $ 0.16us-gaap_EarningsPerShareDiluted $ 0.32us-gaap_EarningsPerShareDiluted $ 0.36us-gaap_EarningsPerShareDiluted $ 1.28us-gaap_EarningsPerShareDiluted $ 0.92us-gaap_EarningsPerShareDiluted $ 1.11us-gaap_EarningsPerShareDiluted