Stock-Based Compensation Plans (Information Regarding Stock Options) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options granted during period	0
Shares
Outstanding — beginning of year	97,962	97,962	115,362
Exercised	(13,701)	0	(17,400)
Canceled	0	0	0
Outstanding — end of year	84,261	97,962	97,962
Exercisable — end of year	84,261	97,962	97,962
Weighted Average Exercise Price
Outstanding — beginning of year	$ 16.61	$ 16.61	$ 15.00
Exercised	11.66	0.00	5.91
Canceled	0.00	0.00	0.00
Outstanding — end of year	17.42	16.61	16.61
Exercisable — end of year	$ 17.42	$ 16.61	$ 16.61
Weighted Average Remaining Contractual Life	1 year	1 year 9 months 18 days
Total intrinsic value of stock options exercised	$ 1,000,000	$ 1,000,000	$ 1,000,000
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General expiration period, from date of grant or time of termination (years)	10 years
Options granted during period	0	0	0
Weighted Average Exercise Price
Unrecognized Compensation Cost Related To Outstanding Stock Option awards	$ 0
Number of stock options vested	$ 0	$ 0	$ 0
Stock Options | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period (years)	1 year
Stock Options | Minimum | Share-based Compensation Award, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period (years)	1 year
Stock Options | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period (years)	5 years
Stock Options | Maximum | Share-based Compensation Award, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
General vesting period (years)	3 years