Share-Based Compensation Plan Stock options outstanding activity (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shares [Roll Forward]
Outstanding at beginning of year (in shares)	58,513	82,171	160,171
Granted (in shares)	0	0	0
Exercised (in shares)	(25,501)	(2,743)	0
Forfeited (in shares)	(3,000)	(20,915)	(78,000)
Outstanding at end of period (in shares)	30,012	58,513	82,171
Options exercisable at year end (in shares)	30,012	58,513	82,171
Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of year (in dollars per share)	$ 15.30	$ 17.32	$ 20.40
Granted (in dollars per share)	$ 0.00	$ 0.00	$ 0.00
Exercised (in dollars per share)	$ 14.00	$ 14.00	$ 0.00
Forfeited (in dollars per share)	$ 39.40	$ 23.42	$ 23.64
Outstanding at end of period (in dollars per share)	$ 14.00	$ 15.30	$ 17.32
Options exercisable at year end (in dollars per share)	$ 14.00	$ 15.30	$ 17.32