Reportable Segments (Details) - USD ($) $ in Thousands		3 Months Ended																12 Months Ended
		Dec. 31, 2015		Sep. 30, 2015	[1]	Jun. 30, 2015	[1]	Mar. 31, 2015	[1]	Dec. 31, 2014		Sep. 30, 2014	[1]	Jun. 30, 2014	[1]	Mar. 31, 2014	[1]	Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest Income (Expense), Net		$ 48,140	[1]	$ 46,473		$ 45,085		$ 46,072		$ 44,128	[1]	$ 44,783		$ 46,268		$ 44,522		$ 185,770		$ 179,701		$ 174,018
Noninterest Income		37,718	[1]	39,446		42,660		41,345		39,922	[1]	33,769		34,374		32,733		161,169		140,798		136,341
Revenues																		346,939		320,499		310,359
Provision/ (credit) for loan losses		(1,655)	[1]	2,600		0		(2,500)		2,400	[1]	(2,600)		(5,000)		(1,200)		(1,555)		(6,400)		(10,000)
Noninterest Expense		67,407	[1]	61,929		62,418		63,427		63,760	[1]	53,999		54,402		54,968		255,181		227,129		220,705
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		20,106	[1]	21,390		25,327		26,490		17,890	[1]	27,153		31,240		23,487		93,313		99,770		99,654
Income tax expense		5,638	[1]	8,182		8,000		8,572		5,901	[1]	8,993		10,333		7,138		30,392	[2]	32,365	[2]	32,963	[2]
Net income from continuing operations																		62,921		67,405		66,691
Net Income (Loss) Attributable to Noncontrolling Interest		921	[1]	994		1,263		1,229		1,322	[1]	1,167		1,025		1,236		4,407		4,750		3,948
Income from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest		1,455	[1]	1,316		1,546		2,094		1,510	[1]	1,272		1,450		1,928		6,411		6,160		7,792
Net income attributable to the Company		15,002	[1]	$ 13,530		$ 17,610		$ 18,783		12,177	[1]	$ 18,265		$ 21,332		$ 17,041		64,925		68,815		70,535
Assets		7,542,508								6,797,874								7,542,508		6,797,874		6,437,109
Assets under Management, Carrying Amount		27,595,000								29,907,000								27,595,000		29,907,000		24,280,000
Amortization of Intangible Assets																		6,711		4,836		4,327
Depreciation																		6,590		6,468		6,235
Gain on sale of Pacific Northwest offices																		0		0		10,574
Restructuring expense																		3,724		739		0
Private Banking Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net																		189,501		183,424		178,199
Noninterest Income																		11,352		10,617		22,454	[3]
Revenues																		200,853		194,041		200,653
Provision/ (credit) for loan losses																		(1,555)		(6,400)		(10,000)
Noninterest Expense																		116,575		111,901		118,488
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest																		85,833		88,540		92,165
Income tax expense	[2]																	27,844		29,032		30,958
Net income from continuing operations																		57,989		59,508		61,207
Net income attributable to the Company																		57,989		59,508		61,207
Assets		7,361,202								6,611,191								7,361,202		6,611,191		6,246,148
Amortization of Intangible Assets																		341		219		277
Depreciation																		4,599		5,294		5,350
Wealth Management and Trust Segment [Member] [Member]
Segment Reporting Information [Line Items]
Noninterest Income																		53,336		34,584		26,547
Revenues																		53,336		34,584		26,547
Noninterest Expense	[4]																	54,474		29,401		20,733
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest																		(1,138)		5,183		5,814
Income tax expense	[2]																	(350)		2,201		2,392
Net income from continuing operations																		(788)		2,982		3,422
Net income attributable to the Company																		(788)		2,982		3,422
Assets		80,088								80,467								80,088		80,467		4,939
Assets under Management, Carrying Amount		7,976,000								9,274,000								7,976,000		9,274,000		4,565,000
Amortization of Intangible Assets																		2,428		676		0
Depreciation																		772		241		105
Investment Managers Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net																		22		22		20
Noninterest Income																		45,687		47,119		43,875
Revenues																		45,709		47,141		43,895
Noninterest Expense																		33,690		34,848		33,195
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest																		12,019		12,293		10,700
Income tax expense	[2]																	3,956		4,078		3,493
Net income from continuing operations																		8,063		8,215		7,207
Net Income (Loss) Attributable to Noncontrolling Interest																		2,265		2,519		2,164
Net income attributable to the Company																		5,798		5,696		5,043
Assets		92,642								100,229								92,642		100,229		100,609
Assets under Management, Carrying Amount		9,952,000								10,772,000								9,952,000		10,772,000		10,401,000
Amortization of Intangible Assets																		2,956		2,955		3,058
Depreciation																		286		240		221
Wealth Advisors Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net																		6		10		66
Noninterest Income																		50,558		48,199		42,350
Revenues																		50,564		48,209		42,416
Noninterest Expense																		35,379		33,213		29,588
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest																		15,185		14,996		12,828
Income tax expense	[2]																	5,819		5,653		4,807
Net income from continuing operations																		9,366		9,343		8,021
Net Income (Loss) Attributable to Noncontrolling Interest																		2,138		2,189		1,784
Net income attributable to the Company																		7,228		7,154		6,237
Assets		79,543								80,804								79,543		80,804		73,972
Assets under Management, Carrying Amount		9,688,000								9,883,000								9,688,000		9,883,000		9,336,000
Amortization of Intangible Assets																		986		986		992
Depreciation																		864		488		363
Holding Company and Eliminations Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net																		(3,759)		(3,755)		(4,267)
Noninterest Income																		236		279		1,115
Revenues																		(3,523)		(3,476)		(3,152)
Noninterest Expense																		15,063		17,766		18,701
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest																		(18,586)		(21,242)		(21,853)
Income tax expense	[2]																	(6,877)		(8,599)		(8,687)
Net income from continuing operations																		(11,709)		(12,643)		(13,166)
Net Income (Loss) Attributable to Noncontrolling Interest																		4		42		0
Income from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	[5]																	6,411		6,160		7,792
Net income attributable to the Company																		(5,302)		(6,525)		(5,374)
Assets		(70,967)								(74,817)								(70,967)		(74,817)		11,441
Assets under Management, Carrying Amount		$ (21,000)								$ (22,000)								(21,000)		(22,000)		(22,000)
Depreciation																		$ 69		$ 205		$ 196

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

[2] The Company’s effective tax rate for 2015, 2014, and 2013 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 2015, 2014, and 2013. See Part II. Item 8. “Financial Statements and Supplementary Data - Note 17: Income Taxes” for additional details.

[3] Included in Private Banking non-interest income for the year ended December 31, 2013 is the $10.6 million gain on sale of the Bank’s three offices in the Pacific Northwest

[4] Operating expense for 2015 includes $3.7 million in restructuring expenses related to the Wealth Management and Trust segment. Operating expense for 2014 includes $0.7 million restructuring expenses. Operating expense for 2013 includes no restructuring expenses

[5] Net income from discontinued operations for the years ended December 31, 2015, 2014 and 2013 of $6.4 million, $6.2 million, and $7.8 million, respectively, are included in Holding Company and Eliminations in the calculation of net income attributable to the Company.