Employee Benefit and Deferred Compensation Plans Employee Benefit Plans Stock Option Rollforward - (Details) - $ / shares	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding at beginning of period (shares)			830,950
Granted (shares)	0	0	0	0
Exercised (shares)			(109,137)
Forfeited (shares)			(7,500)
Options outstanding at end of period (shares)	714,313		714,313
Share-based Compensation Arrangement by Share-based Payment Award, Options, Weighted Average Exercise Price [Roll Forward]
Options outstanding at beginning of period (usd per share)			$ 18.70
Granted (usd per share)			0.00
Exercised (usd per share)			19.57
Forfeited (usd per share)			30.63
Options outstanding at end of period (usd per share)	$ 18.45		$ 18.45