Retirement and Share-based Compensation Plans (Share-based Compensation Expense By Plan) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESOP, compensation expense	$ 2,604	$ 2,486	$ 3,464
Compensation expense	5,128	4,581	5,442
2009 Employee Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	1,911	1,306	1,294
2013 Director Equity And Incentive Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	564	603	380
2011 Director Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expense	$ 49	$ 186	$ 304