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Earnings Per Share (Calculation of Basic and Diluted EPS) (Details) (USD $) In Thousands, except 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
Earnings Per Share [Abstract]
Net income	$ 11,351us-gaap_NetIncomeLoss	$ 13,367us-gaap_NetIncomeLoss	$ 9,195us-gaap_NetIncomeLoss	$ 7,238us-gaap_NetIncomeLoss	$ 6,024us-gaap_NetIncomeLoss	$ 11,333us-gaap_NetIncomeLoss	$ 11,787us-gaap_NetIncomeLoss	$ 6,950us-gaap_NetIncomeLoss	$ 41,151us-gaap_NetIncomeLoss	$ 36,094us-gaap_NetIncomeLoss	$ 28,903us-gaap_NetIncomeLoss
Average common shares:
Basic (weighted-average outstanding shares)									11,875,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	12,050,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	11,899,000us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Dilutive potential common shares from stock options, shares									164,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	162,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment	159,000us-gaap_WeightedAverageNumberDilutedSharesOutstandingAdjustment
Diluted (weighted-average outstanding shares)	11,403,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,205,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,276,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,270,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,262,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,229,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,200,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,158,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,039,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,212,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	12,058,000us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Basic earnings per share (in dollars per share)									$ 3.47us-gaap_EarningsPerShareBasic	$ 3.00us-gaap_EarningsPerShareBasic	$ 2.43us-gaap_EarningsPerShareBasic
Diluted earnings per share (in dollars per share)	$ 1.00us-gaap_EarningsPerShareDiluted	$ 1.10us-gaap_EarningsPerShareDiluted	$ 0.75us-gaap_EarningsPerShareDiluted	$ 0.59us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted	$ 0.93us-gaap_EarningsPerShareDiluted	$ 0.97us-gaap_EarningsPerShareDiluted	$ 0.57us-gaap_EarningsPerShareDiluted	$ 3.42us-gaap_EarningsPerShareDiluted	$ 2.96us-gaap_EarningsPerShareDiluted	$ 2.40us-gaap_EarningsPerShareDiluted
Stock options excluded from diluted earnings per share calculation (shares)									37,261us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	3,831us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	38,954us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount

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