Comprehensive Income (Reclassification Adjustment Details) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Comprehensive Income [Line Items]
Net losses (gains) on investment securities	$ (1)	$ 26	$ 12	$ (422)
Provision for income taxes	964	1,159	3,034	2,911
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Comprehensive Income [Line Items]
Reclassification adjustments, Net of tax	57		181
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized (Gains) Losses on Securities [Member]
Comprehensive Income [Line Items]
Net losses (gains) on investment securities	1		12
Total before tax	1		12
Provision for income taxes	(1)		(4)
Reclassification adjustments, Net of tax	0		8
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension and Postretirement Benefit Plans [Member]
Comprehensive Income [Line Items]
Compensation and benefits	87		266
Total before tax	87		266
Provision for income taxes	(30)		(93)
Reclassification adjustments, Net of tax	$ 57		$ 173