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Bank Loans (Tables)

12 Months Ended

Dec. 31, 2018

Receivables [Abstract]

Schedule Of Balance And Associated Percentage Of Each Major Loan Category In Bank Loan Portfolio

		December 31, 2018								December 31, 2017
		Balance				Percent				Balance				Percent
Commercial and industrial		$	3,304,234				38.5	%		$	2,437,938				34.8	%
Residential real estate			2,875,014				33.5				2,593,576				37.0
Securities-based loans			1,786,966				20.8				1,819,206				25.9
Commercial real estate			318,961				3.7				116,258				1.7
Construction and land			138,245				1.6				7,896				0.1
Home equity lines of credit			38,098				0.4				15,039				0.2
Other			120,129				1.5				24,508				0.3
Gross bank loans			8,581,647				100.0	%			7,014,421				100.0	%
Unamortized loan premium/(discount), net			(12,155	)							788
Loans in process			27,984								(856	)
Unamortized loan fees, net			5,972								872
Allowance for loan losses			(85,833	)							(67,466	)
Bank loans, net		$	8,517,615							$	6,947,759

Activity In The Allowance For Loan Losses By Portfolio Segment

		Year Ended December 31, 2018
		Beginning Balance				Provision				Charge- offs				Recoveries				Ending Balance
Commercial and industrial		$	54,474			$	13,896			$	(12	)		$	9			$	68,367
Residential real estate			8,430				2,798				—				—				11,228
Securities-based loans			2,088				(110	)			—				—				1,978
Commercial real estate			1,520				258				—				—				1,778
Construction and land			100				1,141				—				—				1,241
Home equity lines of credit			162				145				—				3				310
Other			16				71				(2	)			3				88
Qualitative			676				167				—				—				843
		$	67,466			$	18,366			$	(14	)		$	15			$	85,833

		Year Ended December 31, 2017
		Beginning Balance				Provision				Charge- offs				Recoveries				Ending Balance
Commercial and industrial		$	35,127			$	19,666			$	(355	)		$	36			$	54,474
Residential real estate			2,660				5,770				—				—				8,430
Securities-based loans			3,094				(1,006	)			—				—				2,088
Commercial real estate			1,363				2,860				(2,703	)			—				1,520
Home equity lines of credit			371				(212	)			—				3				162
Construction and land			232				(132	)			—				—				100
Other			129				(115	)			—				2				16
Qualitative			2,187				(1,511	)			—				—				676
		$	45,163			$	25,320			$	(3,058	)		$	41			$	67,466

Unpaid Principal Balances Of Loans And Amount Of Allowance Allocated Based Upon Impairment Method By Portfolio Segment

		Allowance for Loan Losses												Recorded Investment in Loans
		Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total				Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total
Commercial and industrial		$	8,678			$	59,689			$	68,367			$	23,677			$	3,280,557			$	3,304,234
Residential real estate			24				11,204				11,228				519				2,874,495				2,875,014
Securities-based loans			—				1,978				1,978				—				1,786,966				1,786,966
Commercial real estate			—				1,778				1,778				—				318,961				318,961
Construction and land			—				1,241				1,241				—				138,245				138,245
Home equity lines of credit			—				310				310				184				37,914				38,098
Other			1				87				88				21				120,108				120,129
Qualitative			—				843				843				—				—				—
		$	8,703			$	77,130			$	85,833			$	24,401			$	8,557,246			$	8,581,647

		Allowance for Loan Losses												Recorded Investment in Loans
		Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total				Individually Evaluated for Impairment				Collectively Evaluated for Impairment				Total
Residential real estate		$	24			$	8,406			$	8,430			$	171			$	2,593,405			$	2,593,576
Commercial and industrial			9,059				45,415				54,474				28,856				2,409,082				2,437,938
Securities-based loans			—				2,088				2,088				—				1,819,206				1,819,206
Commercial real estate			—				1,520				1,520				—				116,258				116,258
Home equity lines of credit			20				142				162				184				14,855				15,039
Construction and land			—				100				100				—				7,896				7,896
Other			2				14				16				2				24,506				24,508
Qualitative			—				676				676				—				—				—
		$	9,105			$	58,361			$	67,466			$	29,213			$	6,985,208			$	7,014,421

Loans That Were Individually Evaluated For Impairment By Portfolio Segment

		December 31, 2018
		Unpaid Contractual Principal Balance				Recorded Investment with No Allowance				Recorded Investment with Allowance				Total Recorded Investment				Related Allowance				Average Recorded Investment
Commercial and industrial		$	23,677			$	242			$	23,435			$	23,677			$	8,678			$	23,807
Residential real estate			544				352				167				519				24				275
Home equity lines of credit			184				184				—				184				—				184
Other			694				11				10				21				1				70
Total		$	25,099			$	789			$	23,612			$	24,401			$	8,703			$	24,336

		December 31, 2017
		Unpaid Contractual Principal Balance				Recorded Investment with No Allowance				Recorded Investment with Allowance				Total Recorded Investment				Related Allowance				Average Recorded Investment
Commercial and industrial		$	28,856			$	5,211			$	23,645			$	28,856			$	9,059			$	30,277
Home equity lines of credit			184			—					184				184				20				300
Residential real estate			171			—					171				171				24				174
Other			677			—					2				2				2				5
Total		$	29,888			$	5,211			$	24,002			$	29,213			$	9,105			$	30,756

Aging Of The Recorded Investment In Past Due Loans

		December 31, 2018
		30-89 Days Past Due				90 or More Days Past Due				Total Past Due				Current Balance				Total
Commercial and industrial		$	—			$	14,656			$	14,656			$	3,289,578				3,304,234
Residential real estate			6,970				377				7,347				2,867,667				2,875,014
Securities-based loans			—				—				—				1,786,966				1,786,966
Commercial real estate			—				—				—				318,961				318,961
Construction and land			—				—				—				138,245				138,245
Home equity lines of credit			33				—				33				38,065				38,098
Other			—				134				134				119,995				120,129
Total		$	7,003			$	15,167			$	22,170			$	8,559,477			$	8,581,647

		December 31, 2018 *
		Non-accrual				Restructured				Total
Commercial and industrial		$	14,741			$	8,936			$	23,677
Residential real estate			352				167				519
Home equity lines of credit			184				—				184
Other			21				—				21
Total		$	15,298			$	9,103			$	24,401

* There were no loans past due 90 days and still accruing interest at December 31, 2018.

		December 31, 2017
		30 – 89 Days Past Due				90 or More Days Past Due				Total Past Due				Current Balance				Total
Residential real estate		$	7,892			$	—			$	7,892			$	2,585,684				2,593,576
Commercial and industrial			11,883				—				11,883				2,426,055				2,437,938
Securities-based loans			—				—				—				1,819,206				1,819,206
Commercial real estate			—				—				—				116,258				116,258
Home equity lines of credit			184				—				184				14,855				15,039
Construction and land			—				—				—				7,896				7,896
Other			2				—				2				24,506				24,508
Total		$	19,961			$	—			$	19,961			$	6,994,460			$	7,014,421

		December 31, 2017 *
		Non-accrual				Restructured				Total
Commercial and industrial		$	19,904			$	8,952			$	28,856
Home equity lines of credit			184				—				184
Residential real estate			—				171				171
Other			2				—				2
Total		$	20,090			$	9,123			$	29,213

* There were no loans past due 90 days and still accruing interest at December 31, 2017.

Risk Category Of Loan Portfolio

		December 31, 2018
		Pass				Special Mention				Substandard				Doubtful				Total
Commercial and industrial		$	3,254,698			$	34,795			$	14,741			$	—			$	3,304,234
Residential real estate			2,874,495				—				519				—				2,875,014
Securities-based loans			1,786,966				—				—				—				1,786,966
Commercial real estate			318,961				—				—				—				318,961
Construction and land			138,245				—				—				—				138,245
Home equity lines of credit			37,914				—				184				—				38,098
Other			119,912				196				—				21				120,129
Total		$	8,531,191			$	34,991			$	15,444			$	21			$	8,581,647

		December 31, 2017
		Pass				Special Mention				Substandard				Doubtful				Total
Residential real estate		$	2,593,096			$	309			$	171			$	—				2,593,576
Commercial and industrial			2,385,152				22,443				30,343				—				2,437,938
Securities-based loans			1,819,206				—				—				—				1,819,206
Commercial real estate			116,258				—				—				—				116,258
Home equity lines of credit			14,855				—				184				—				15,039
Construction and land			7,896				—				—				—				7,896
Other			24,506				—				2				—				24,508
Total		$	6,960,969			$	22,752			$	30,700			$	—			$	7,014,421

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