Comprehensive Income (Reclassification Adjustment Details) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Comprehensive Income [Line Items]
Net losses (gains) on investment securities	$ 13	$ (372)	$ 13	$ (448)
Provision for income taxes	1,053	921	2,070	1,752
Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Comprehensive Income [Line Items]
Reclassification adjustments, Net of tax	64		124
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Unrealized (Gains) Losses Securities [Member]
Comprehensive Income [Line Items]
Net losses (gains) on investment securities	13		13
Total before tax	13		13
Provision for income taxes	(5)		(5)
Reclassification adjustments, Net of tax	8		8
Reclassification Out Of Accumulated Other Comprehensive Income [Member] | Pension and Postretirement Benefit Plans [Member]
Comprehensive Income [Line Items]
Compensation and benefits	87		179
Total before tax	87		179
Provision for income taxes	(31)		(63)
Reclassification adjustments, Net of tax	$ 56		$ 116