Other Comprehensive Income/Loss (Amounts Reclassified From Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Amounts reclassified from accumulated other comprehensive loss to the consolidated statements of income
Gain on sales of securities	$ 0	$ 72	$ 86	$ 72
Compensation and benefits	(36,708)	(37,655)	(74,961)	(73,936)
Total reclassifications, before tax	27,959	31,583	56,217	60,468
Income tax expense	(9,623)	(152)	(19,316)	(9,730)
Net income	18,336	31,431	36,901	50,738
Amount Reclassified from Accumulated Other Comprehensive Loss
Amounts reclassified from accumulated other comprehensive loss to the consolidated statements of income
Total reclassifications, before tax	(576)	(705)	(1,204)	(1,509)
Income tax expense	232	304	486	610
Net income	(344)	(401)	(718)	(899)
Net unrealized gain (loss) on securities available-for-sale | Amount Reclassified from Accumulated Other Comprehensive Loss
Amounts reclassified from accumulated other comprehensive loss to the consolidated statements of income
Gain on sales of securities	0	72	86	72
Net actuarial loss on pension plans and other postretirement benefits | Amount Reclassified from Accumulated Other Comprehensive Loss
Amounts reclassified from accumulated other comprehensive loss to the consolidated statements of income
Compensation and benefits	(528)	(729)	(1,195)	(1,486)
Prior service cost on pension plans and other postretirement benefits | Amount Reclassified from Accumulated Other Comprehensive Loss
Amounts reclassified from accumulated other comprehensive loss to the consolidated statements of income
Compensation and benefits	$ (48)	$ (48)	$ (95)	$ (95)