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Bank Loans (Schedule of Balance and Associated Percentage of Each Major Loan Category in Bank Loan Portfolio) (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 20,349,581		$ 19,441,467
Loans in process/(unapplied loan payments), net	(38,825)		1,108
Unamortized loan fees, net	(5,720)		(8,478)
Allowance for loan losses	(137,350)	$ (135,114)	(128,292)	$ (135,797)	$ (122,681)	$ (111,653)
Loans held for investment, net	$ 20,167,686		$ 19,305,805
Gross bank loans, Percent	100.00%		100.00%
Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 8,406,932		$ 8,047,647
Allowance for loan losses	$ (11,270)	(11,242)	$ (13,855)	(14,607)	(14,413)	(20,441)
Gross bank loans, Percent	41.30%		41.40%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 3,896,824		$ 3,566,987
Allowance for loan losses	$ (79,862)	(76,354)	$ (67,077)	(74,659)	(66,377)	(54,143)
Gross bank loans, Percent	19.10%		18.30%
Fund Banking [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 3,762,960		$ 3,633,126
Allowance for loan losses	$ (10,537)	(12,179)	$ (10,173)	(11,518)	(12,178)	(11,711)
Gross bank loans, Percent	18.50%		18.70%
Securities-Based Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 2,273,246		$ 2,306,455
Allowance for loan losses	$ (2,853)	(2,813)	$ (3,035)	(3,018)	(3,086)	(3,157)
Gross bank loans, Percent	11.20%		11.90%
Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 1,219,787		$ 1,034,370
Allowance for loan losses	$ (19,775)	(16,379)	$ (11,817)	(11,500)	(12,645)	(8,568)
Gross bank loans, Percent	6.00%		5.30%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 565,686		$ 660,631
Allowance for loan losses	$ (12,315)	(15,312)	$ (21,386)	(19,866)	(13,429)	(12,897)
Gross bank loans, Percent	2.80%		3.40%
Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 170,732		$ 136,270
Allowance for loan losses	$ (219)	(362)	$ (371)	(195)	(168)	(364)
Gross bank loans, Percent	0.80%		0.70%
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 53,414		$ 55,981
Allowance for loan losses	$ (519)	$ (473)	$ (578)	$ (434)	$ (385)	$ (372)
Gross bank loans, Percent	0.30%		0.30%

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