Accumulated Other Comprehensive Income Amounts reclassified from Accumulated Other Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investment securities, net									$ 462	$ 3,733	$ (2,816)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest	27,884	20,010	22,005	17,111	18,804	16,535	16,266	12,100	87,010	63,705	65,942
Income Tax Expense (Benefit)	(7,911)	(6,734)	(7,414)	(4,935)	(5,342)	(4,655)	(4,367)	(3,198)	(26,994)	(17,562)	(17,905)
Net income (loss)	19,973	13,276	14,591	12,176	13,462	11,880	11,899	8,902	60,016	46,143	48,037
Compensation and employee benefits									125,432	85,434	81,552
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Defined Benefit Plans Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									(400)
Income Tax Expense (Benefit)									135
Net income (loss)									(265)
Compensation and employee benefits									(400)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain on sale of investment securities, net									462
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest									462
Income Tax Expense (Benefit)									(163)
Net income (loss)									$ 299