Stock Option Plan (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Stock Option Plan [Abstract]
Options maximum term period	10 years
Shares [Roll Forward]
Options outstanding, beginning of period (in shares)	165,710
Granted (in shares)	0
Exercised (in shares)	0
Canceled or expired (in shares)	(8,750)
Options outstanding, end of period (in shares)	156,960	165,710
Options exercisable, end of period (in shares)	156,960
Weighted Average Exercise Price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)	$ 21.64
Granted (in dollars per share)	$ 0
Exercised (in dollars per share)	$ 0
Canceled or expired (in dollars per share)	$ 21.67
Options outstanding, end of period (in dollars per share)	$ 21.63	$ 21.64
Options exercisable, end of period (in dollars per share)	$ 21.63
Weighted Average Remaining Contractual Life (in years) [Abstract]
Options outstanding, end of period	3 years 5 months 16 days
Options exercisable, end of period	3 years 5 months 16 days
Aggregate Intrinsic Value [Abstract]
Options outstanding, end of period	$ 0
Options exercisable, end of period	0
Number of option holders that exercised	6
Proceeds from exercise of stock options	0	284,000
Unrecognized compensation expense related to nonvested options	0
Stock compensation expense	$ 82,000	$ 110,000
Information pertaining to options outstanding [Abstract]
Options Outstanding, Number Outstanding (in shares)	156,960
Options Outstanding, Weighted Average Remaining Contractual Life	3 years 5 months 16 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 21.63
Options Exercisable, Number Exercisable (in shares)	156,960
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 21.63
23.83 [Member]
Information pertaining to options outstanding [Abstract]
Range of Exercise Prices (in dollars per share)	$ 23.83
Options Outstanding, Number Outstanding (in shares)	65,750
Options Outstanding, Weighted Average Remaining Contractual Life	1 year 7 months 6 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 23.83
Options Exercisable, Number Exercisable (in shares)	65,750
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 23.83
20.05 [Member]
Information pertaining to options outstanding [Abstract]
Range of Exercise Prices (in dollars per share)	$ 20.05
Options Outstanding, Number Outstanding (in shares)	91,210
Options Outstanding, Weighted Average Remaining Contractual Life	4 years 9 months 14 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 20.05
Options Exercisable, Number Exercisable (in shares)	91,210
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 20.05