Equity Incentive Plan (Details) (USD $)	3 Months Ended
	Mar. 31, 2013 item
Equity Incentive Plan
Number of equity incentive plans	1
Stock Options
Number of Shares
Outstanding at beginning of year (in shares)	40,681
Granted (in shares)	22,000
Outstanding at end of period (in shares)	62,681
Exercisable at end of period (in shares)	20,459
Weighted Average Exercise Price
Outstanding at beginning of year (in dollars per share)	9.49
Granted (in dollars per share)	14.00
Outstanding at end of period (in dollars per share)	11.07
Weighted average fair value of options granted during the period (in dollars per share)	5.31