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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, 2025	Jun. 30, 2025	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 21,177,141		$ 20,879,745
Loans in process/(unapplied loan payments), net	(4,658)		(2,885)
Unamortized loan fees, net	712		(5,756)
Allowance for credit losses on loans	(134,022)	$ (135,734)	(139,308)	$ (137,350)	$ (135,114)	$ (128,292)
Loans held for investment, net	$ 21,039,173		$ 20,731,796
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	$ 9,085,945		$ 8,565,193
Allowance for credit losses on loans	$ (12,509)	(13,767)	$ (11,061)	(11,270)	(11,242)	(13,855)
Gross bank loans, Percent	42.90%		41.00%
Fund Banking [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 3,881,895		$ 3,854,222
Allowance for credit losses on loans	$ (10,816)	(10,948)	$ (10,792)	(10,537)	(12,179)	(10,173)
Gross bank loans, Percent	18.30%		18.50%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 3,760,005		$ 4,062,029
Allowance for credit losses on loans	$ (85,830)	(84,981)	$ (92,698)	(79,862)	(76,354)	(67,077)
Gross bank loans, Percent	17.80%		19.50%
Securities-Based Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 2,565,897		$ 2,389,593
Allowance for credit losses on loans	$ (3,180)	(3,128)	$ (2,917)	(2,853)	(2,813)	(3,035)
Gross bank loans, Percent	12.10%		11.40%
Construction And Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 1,166,895		$ 1,242,002
Allowance for credit losses on loans	$ (12,225)	(12,854)	$ (12,866)	(19,775)	(16,379)	(11,817)
Gross bank loans, Percent	5.50%		5.90%
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 437,570		$ 518,923
Allowance for credit losses on loans	$ (8,603)	(8,795)	$ (8,057)	(12,315)	(15,312)	(21,386)
Gross bank loans, Percent	2.10%		2.50%
Home Equity Lines Of Credit [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 218,320		$ 193,850
Allowance for credit losses on loans	$ (243)	(660)	$ (317)	(219)	(362)	(371)
Gross bank loans, Percent	1.00%		0.90%
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total risk category of loan portfolio	$ 60,614		$ 53,933
Allowance for credit losses on loans	$ (616)	$ (601)	$ (600)	$ (519)	$ (473)	$ (578)
Gross bank loans, Percent	0.30%		0.30%

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