Stockholders' Equity (Details) (USD $)	3 Months Ended	12 Months Ended
	Sep. 30, 2012	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued institutional investors	1,783,000
Common stock shares issued directors and officers	56,533
Sale of stock institutional investors price per share (dollars per share)	$ 13.5
Sale of stock directors and officers price per share (dollars per share)	$ 16.44
Common stock sold institutional investors value	$ 24,100,000
Common stock sold directors and officers value	900,000
Sale of stock issuance costs	2,200,000
Proceeds from Private Equity Offering - Net of Issuance Costs		22,759,000	0	0
Sale of stock equity returned to parent company	22,500,000
Shareholder discount percentage for dividend reinvestment (in hundredths)		3.00%
Shares issued under Dividend Reinvestment Plan (in shares)			32,614	54,305
Company's common stock reserved for issuance (in shares)		500,000
Common stock issued (in shares)		150,000
Options vesting period		1 year
Vesting rate		1.33333
Compensation expense		458,000	0	8,000
Remaining unrecognized compensation cost		$ 710,000
Remaining Unrecognized Compensation Cost Remaining Vesting Period		2 years 10 months 24 days
Shares [Roll Forward]
Balance at Beginning (in shares)		111,500	89,500	154,500
Options granted (in shares)		130,000	50,000	0
Options exercised (in shares)		0	(5,000)	(29,000)
Options expired or forfeited (in shares)		(30,000)	(23,000)	(36,000)
Balance at Ending (in shares)		211,500	111,500	89,500
Weighted Average Exercise Price [Roll Forward]
Balance at Beginning (in dollars per share)		$ 22.57	$ 30.32	$ 27.81
Options granted (in dollars per share)		$ 13.15	$ 10.79	$ 0
Options exercised (in dollars per share)		$ 0	$ 15.50	$ 14.44
Options expired or forfeited (in dollars per share)		$ 32.23	$ 28.67	$ 32.32
Balance at Ending (in dollars per share)		$ 15.41	$ 22.57	$ 30.32
Additional information [Abstract]
Average remaining contractual life in years		8 years 4 months 24 days	6 years 11 months 9 days	4 years 9 months
Exercisable options (vested) (in shares)		31,500	61,500	89,500
Options granted during the year [Abstract]
Options granted (in shares)		130,000	50,000	0
Weighted average fair value of options (Black-Scholes model) at date of grant (in dollars per share)		$ 7.13	$ 5.95	$ 0
Black-Scholes Assumptions [Abstract]
Risk-free interest rate (in hundredths)		0.78%	2.10%	0.00%
Expected dividend yield (in hundredths)				0.00%
Expected life (in years)		10 years	10 years	0 years
Expected volatility (in hundredths)		43.03%	42.60%	0.00%
Contractual weighted-average lives of outstanding options at various prices [Abstract]
Total outstanding, Options (in shares)		211,500	111,500	89,500
Total exercisable, Options (in shares)		31,500
Total outstanding, Weighted-average price (in dollars per share)		$ 15.41	$ 22.57	$ 30.32
Total exercisable, Weighted-average price (in dollars per share)		$ 32.08
Total outstanding life, Weighted-average price		8 years 4 months 24 days
Total exercisable life, Weighted-average price		8 years 4 months 24 days	6 years 11 months 9 days	4 years 9 months
Period of prior retained net profits to pay dividends		2 years
10.79 - $12.44 [Member]
Contractual weighted-average lives of outstanding options at various prices [Abstract]
From (in dollars per share)		$ 10.79
To (in dollars per share)		$ 12.44
Outstanding stock options (in shares)		100,000
Weighted-average remaining life		9 years 2 months 12 days
Weighted-average exercise price (in dollars per share)		$ 11.49
Exercisable stock options (in shares)		0
13.13 - $14.97 [Member]
Contractual weighted-average lives of outstanding options at various prices [Abstract]
From (in dollars per share)		$ 13.13
To (in dollars per share)		$ 14.97
Outstanding stock options (in shares)		80,000
Weighted-average remaining life		9 years 3 months 18 days
Weighted-average exercise price (in dollars per share)		$ 13.75
Exercisable stock options (in shares)		0
28.30 - $31.83 [Member]
Contractual weighted-average lives of outstanding options at various prices [Abstract]
From (in dollars per share)		$ 28.30
To (in dollars per share)		$ 31.83
Outstanding stock options (in shares)		17,000
Weighted-average remaining life		3 years 10 months 24 days
Weighted-average exercise price (in dollars per share)		$ 30.43
Exercisable stock options (in shares)		17,000
Weighted-average remaining life		3 years 10 months 24 days
Weighted-average exercise price (in dollars per share)		$ 30.43
32.90 - $34.95 [Member]
Contractual weighted-average lives of outstanding options at various prices [Abstract]
From (in dollars per share)		$ 32.90
To (in dollars per share)		$ 34.95
Outstanding stock options (in shares)		14,500
Weighted-average remaining life		3 years 1 month 6 days
Weighted-average exercise price (in dollars per share)		$ 34.01
Exercisable stock options (in shares)		14,500
Weighted-average remaining life		3 years 1 month 6 days
Weighted-average exercise price (in dollars per share)		$ 34.01
Chief Executive Officer [Member]
Shares [Roll Forward]
Options granted (in shares)			30,000
Options granted during the year [Abstract]
Options granted (in shares)			30,000
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options vesting period		10 years