Selected Quarterly Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, 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
Condensed Financial Statements, Captions [Line Items]
Interest Income (Expense), Net	$ 43,541	[1]	$ 42,302	[1]	$ 43,899	[1]	$ 44,276	[1]	$ 45,546	[1]	$ 46,366	[1]	$ 46,596	[1]	$ 44,768	[1]	$ 174,018		$ 183,276		$ 178,954
Noninterest Income	34,345	[1]	30,251	[1]	41,006	[1]	30,739	[1]	30,446	[1]	28,769	[1]	28,153	[1]	27,598	[1]	136,341		114,966		118,911
Revenue, Net	77,886	[1]	72,553	[1]	84,905	[1]	75,015	[1]	75,992	[1]	75,135	[1]	74,749	[1]	72,366	[1]
Provision/ (credit) for loan losses	(2,000)	[1]	(6,000)	[1]	(2,000)	[1]	0	[1]	(5,000)	[1]	(4,000)	[1]	1,700	[1]	4,000	[1]	(10,000)		(3,300)		13,160
Noninterest Expense	55,705	[1]	52,110	[1]	56,838	[1]	56,707	[1]	62,889	[1]	58,315	[1]	55,479	[1]	55,771	[1]	221,360		232,454		234,324	[2]
Income before income taxes	24,181	[1]	26,443	[1]	30,067	[1]	18,308	[1]	18,103	[1]	20,820	[1]	17,570	[1]	12,595	[1]	98,999		69,088		50,381
Income tax expense	7,303	[1]	8,557	[1]	10,551	[1]	5,897	[1]	6,115	[1]	5,124	[1]	5,240	[1]	3,851	[1]	32,308	[3]	20,330	[3]	14,280	[3]
Net income from discontinued operations	1,968	[1]	1,321	[1]	2,781	[1]	1,722	[1]	1,819	[1]	1,672	[1]	2,590	[1]	1,554	[1]	7,792		7,635		6,184
Net Income (Loss) Attributable to Noncontrolling Interest	1,178	[1]	871	[1]	969	[1]	930	[1]	715	[1]	855	[1]	759	[1]	793	[1]	3,948		3,122		3,148
Net income attributable to the Company	$ 17,668	[1]	$ 18,336	[1]	$ 21,328	[1]	$ 13,203	[1]	$ 13,092	[1]	$ 16,513	[1]	$ 14,161	[1]	$ 9,505	[1]	$ 70,535		$ 53,271		$ 39,137
Earnings (Loss) Per Share, Basic:	$ 0.21	[4]	$ 0.23	[4]	$ 0.11	[4]	$ 0.15	[4]	$ 0.15	[4]	$ 0.19	[4]	$ 0.17	[4]	$ 0.11	[4]	$ 0.70		$ 0.62		$ 0.46
Earnings/ (Loss) Per Share, Diluted	$ 0.20	[4]	$ 0.22	[4]	$ 0.11	[4]	$ 0.15	[4]	$ 0.15	[4]	$ 0.19	[4]	$ 0.17	[4]	$ 0.11	[4]	$ 0.68		$ 0.61		$ 0.46

[1] Due to rounding, the sum of the four quarters may not add to the year to date total.

[2] Non-interest expense for 2013 includes no restructuring expenses. Non-interest expense for 2012 includes $5.9 million of restructuring expenses; restructuring expenses incurred by the Private Banking segment amounted to $4.0 million, with the remaining $1.9 million incurred by the Holding Company. Non-interest expense for 2011 includes $8.1 million of restructuring expenses; restructuring expenses incurred by the Private Banking segment amounted to $5.5 million, with the remaining $2.6 million incurred by the Holding Company.

[3] The Company’s effective tax rate for 2013, 2012, and 2011 are not consistent due to earnings from tax-exempt investments, non-deductible compensation, state and local taxes, income tax credits and income attributable to noncontrolling interests having a different impact on the effective tax rate due primarily to the different levels of income before taxes in years 2013, 2012, and 2011. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 17: Income Taxes” for additional details.

[4] Includes the effect of adjustments to net income attributable to the Company to arrive at net income attributable to common shareholders.