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Earnings Per Share (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Earnings Per Share [Abstract]    
Net income $ 17,822us-gaap_NetIncomeLoss $ 15,244us-gaap_NetIncomeLoss
Weighted average shares outstanding- basic and diluted (in shares) 5,111,201us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 5,109,717us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted
Net income per common share- basic and diluted (in dollars per share) $ 3.49us-gaap_EarningsPerShareBasicAndDiluted $ 2.98us-gaap_EarningsPerShareBasicAndDiluted