Employee Benefit and Deferred Compensation Plans Employee Benefit Plans Stock Option Rollforward - (Details) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Shares
Options outstanding at beginning of period (shares)			830,950
Granted (shares)	0	0	0	0
Exercised (shares)			(129,785)
Forfeited (shares)			(7,500)
Options outstanding at end of period (shares)	693,665		693,665
Weighted Average Exercise Price
Options outstanding at beginning of period (usd per share)			$ 18.70
Granted (usd per share)			0.00
Exercised (usd per share)			19.55
Forfeited (usd per share)			30.63
Options outstanding at end of period (usd per share)	$ 18.42		$ 18.42