Reportable Segments (Details) (USD $)	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Dec. 31, 2013
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	$ 44,522,000		$ 44,276,000
Noninterest Income	32,733,000		30,761,000
Revenues	77,255,000		75,037,000
Noninterest Expense	54,968,000		56,586,000
Income tax expense	7,138,000		6,040,000
Net income from continuing operations	16,349,000		12,411,000
Net income attributable to noncontrolling interests	1,236,000		930,000
Net Income (Loss) Attributable to Parent	17,041,000		13,203,000
Amortization of intangibles	1,053,000		1,118,000
Total assets	6,705,420,000		6,196,421,000		6,437,109,000
Assets under Management, Carrying Amount	24,736,000,000		21,947,000,000
Depreciation	1,671,000		1,521,000
Net income from discontinued operations	1,928,000		1,722,000
Reportable Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	45,447,000		45,395,000
Noninterest Income	32,597,000		30,052,000
Revenues	78,044,000		75,447,000
Noninterest Expense	49,761,000		49,956,000
Income tax expense	10,118,000		8,474,000
Net income from continuing operations	19,365,000		17,017,000
Net income attributable to noncontrolling interests	1,194,000		930,000
Net Income (Loss) Attributable to Parent	18,171,000		16,087,000
Amortization of intangibles	1,053,000		1,118,000
Total assets	6,697,950,000		6,178,778,000
Assets under Management, Carrying Amount	24,758,000,000		21,968,000,000
Depreciation	1,561,000		1,469,000
Private Banking Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	45,405,000		45,369,000
Noninterest Income	9,671,000		9,890,000
Revenues	55,076,000		55,259,000
Noninterest Expense	33,644,000		34,635,000
Income tax expense	7,679,000		6,824,000
Net income from continuing operations	14,953,000		13,800,000
Net income attributable to noncontrolling interests	0		0
Net Income (Loss) Attributable to Parent	14,953,000		13,800,000
Amortization of intangibles	67,000		69,000
Total assets	6,526,105,000		6,010,107,000
Assets under Management, Carrying Amount	4,612,000,000		4,167,000,000
Depreciation	1,430,000		1,329,000
Investment Managers Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	6,000		6,000
Noninterest Income	11,462,000		10,096,000
Revenues	11,468,000		10,102,000
Noninterest Expense	8,334,000		7,745,000
Income tax expense	1,047,000		773,000
Net income from continuing operations	2,087,000		1,584,000
Net income attributable to noncontrolling interests	635,000		466,000
Net Income (Loss) Attributable to Parent	1,452,000		1,118,000
Amortization of intangibles	739,000		800,000
Total assets	100,788,000		102,205,000
Assets under Management, Carrying Amount	10,505,000,000		9,314,000,000
Depreciation	59,000		52,000
Wealth Advisors Segment [Member]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	36,000		20,000
Noninterest Income	11,464,000		10,066,000
Revenues	11,500,000		10,086,000
Noninterest Expense	7,783,000		7,576,000
Income tax expense	1,392,000		877,000
Net income from continuing operations	2,325,000		1,633,000
Net income attributable to noncontrolling interests	559,000		464,000
Net Income (Loss) Attributable to Parent	1,766,000		1,169,000
Amortization of intangibles	247,000		249,000
Total assets	71,057,000		66,466,000
Assets under Management, Carrying Amount	9,641,000,000		8,487,000,000
Depreciation	72,000		88,000
Holding Company and Eliminations Segment [Domain]
Segment Reporting Information [Line Items]
Interest Income (Expense), Net	(925,000)		(1,119,000)
Noninterest Income	136,000		709,000
Revenues	(789,000)		(410,000)
Noninterest Expense	5,207,000		6,630,000
Income tax expense	(2,980,000)		(2,434,000)
Net income from continuing operations	(3,016,000)		(4,606,000)
Net income attributable to noncontrolling interests	42,000		0
Net Income (Loss) Attributable to Parent	(1,130,000)	[1]	(2,884,000)	[1]
Amortization of intangibles	0		0
Total assets	7,470,000		17,643,000
Assets under Management, Carrying Amount	(22,000,000)		(21,000,000)
Depreciation	$ 110,000		$ 52,000

[1] Net income from discontinued operations for the three months ended March 31, 2014, and 2013 of $1.9 million, and $1.7 million, respectively, are included in Holding Company and Eliminations in the calculation of net income attributable to the Company.