Earning Per Common Share (Schedule of Earnings Per Share, Basic and Diluted) (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 Common Share [Abstract]
Income from continuing operations	$ 6,038	$ 9,119	$ 6,848	$ 3,649	$ 7,275	$ 9,793	$ 7,257	$ 4,951	$ 25,654	$ 29,276	$ 14,764
Income from discontinued operations	(9)	(3)	14	0	0	0	38	(24)	2	14	1,424
Net income	$ 6,029us-gaap_NetIncomeLoss	$ 9,116us-gaap_NetIncomeLoss	$ 6,862us-gaap_NetIncomeLoss	$ 3,649us-gaap_NetIncomeLoss	$ 7,275us-gaap_NetIncomeLoss	$ 9,793us-gaap_NetIncomeLoss	$ 7,295us-gaap_NetIncomeLoss	$ 4,927us-gaap_NetIncomeLoss	$ 25,656us-gaap_NetIncomeLoss	$ 29,290us-gaap_NetIncomeLoss	$ 16,188us-gaap_NetIncomeLoss
Weighted average shares									10,225,000	10,175,000	10,124,000
Denominator for basic earnings per common share									10,225,000	10,175,000	10,124,000
Employee stock options									6,000	11,000	16,000
Other stock compensation plans									101,000	74,000	94,000
Dilutive potential common shares									107,000	85,000	110,000
Denominator for diluted earnings per common share - adjusted weighted average shares and assumed conversions									10,332,000	10,260,000	10,234,000
Basic earnings per common share: From continuing operations	$ 0.59	$ 0.89	$ 0.67	$ 0.36	$ 0.71	$ 0.96	$ 0.71	$ 0.49	$ 2.51	$ 2.88	$ 1.46
Basic earnings per common share: From discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.14
Basic earnings per common share	$ 0.59us-gaap_EarningsPerShareBasic	$ 0.89us-gaap_EarningsPerShareBasic	$ 0.67us-gaap_EarningsPerShareBasic	$ 0.36us-gaap_EarningsPerShareBasic	$ 0.71us-gaap_EarningsPerShareBasic	$ 0.96us-gaap_EarningsPerShareBasic	$ 0.72us-gaap_EarningsPerShareBasic	$ 0.49us-gaap_EarningsPerShareBasic	$ 2.51us-gaap_EarningsPerShareBasic	$ 2.88us-gaap_EarningsPerShareBasic	$ 1.60us-gaap_EarningsPerShareBasic
Diluted earnings per common share: From continuing operations	$ 0.58	$ 0.88	$ 0.66	$ 0.35	$ 0.71	$ 0.95	$ 0.71	$ 0.48	$ 2.48	$ 2.85	$ 1.44
Diluted earnings per common share: From discontinued operations	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.00	$ 0.14
Diluted earnings per common share	$ 0.58us-gaap_EarningsPerShareDiluted	$ 0.88us-gaap_EarningsPerShareDiluted	$ 0.67us-gaap_EarningsPerShareDiluted	$ 0.35us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.95us-gaap_EarningsPerShareDiluted	$ 0.71us-gaap_EarningsPerShareDiluted	$ 0.48us-gaap_EarningsPerShareDiluted	$ 2.48us-gaap_EarningsPerShareDiluted	$ 2.85us-gaap_EarningsPerShareDiluted	$ 1.58us-gaap_EarningsPerShareDiluted
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount									0	0	0
Common Stock, Dividends, Per Share, Cash Paid	$ 0.04	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.03	$ 0.13	$ 0.12	$ 0.10

Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

Name:	us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration