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Loans and Leases Held for Investment - Nonaccrual Loans and Leases by Loan Portfolio Segment and Class (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2025	Jun. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	$ 174,541		$ 168,341	$ 174,541	$ 168,341	$ 189,605
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	23,949,274			23,949,274		23,601,470
Loans held for investment, net	24,110,642		23,527,777	24,110,642	23,527,777	23,781,663
Financing Receivable, Nonaccrual, Interest Income	3		3	9	10
Leased equipment depreciation	6,750	$ 6,700	7,144	20,191	22,175
Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	23,936,101			23,936,101		23,592,058
Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	166,810		129,908	166,810	129,908	167,206
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,426,742			13,426,742		13,268,343
Loans held for investment, net	13,579,862		13,334,406	13,579,862	13,334,406	13,427,659
Financing Receivable, Nonaccrual, Interest Income	3		3	9	10
Real Estate Mortgage | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,413,052			13,413,052		13,260,453
Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0		0	0	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,154,826			2,154,826		3,172,293
Loans held for investment, net	2,154,826		3,459,409	2,154,826	3,459,409	3,172,293
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Real Estate Construction and Land | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,154,826			2,154,826		3,172,293
Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	6,779		37,914	6,779	37,914	21,775
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	8,001,994			8,001,994		6,761,249
Loans held for investment, net	8,006,657		6,319,472	8,006,657	6,319,472	6,778,829
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Commercial | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	7,999,878			7,999,878		6,757,054
Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	952		519	952	519	624
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	365,712			365,712		399,585
Loans held for investment, net	369,297		414,490	369,297	414,490	402,882
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Consumer | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	368,345			368,345		402,258
Finance Receivable Allowance | Consumer
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	621		519	621	519
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
No Finance Receivable Allowance | Consumer
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Financing Receivable, Nonaccrual, No Allowance	331		0	331	0
Commercial | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	99,103			99,103		97,655
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,238,197			4,238,197		4,528,511
Loans held for investment, net	4,292,625			4,292,625		4,578,772
Financing Receivable, Nonaccrual, No Allowance	98,971		78,277	98,971	78,277
Commercial | Real Estate Mortgage | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,193,522			4,193,522		4,481,117
Commercial | Finance Receivable Allowance | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	132		201	132	201
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Commercial | No Finance Receivable Allowance | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	3		3	9	10
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	66,866			66,866		46,788
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,063,872			3,063,872		2,730,325
Loans held for investment, net	3,162,564			3,162,564		2,807,174
Financing Receivable, Nonaccrual, No Allowance	66,866		50,282	66,866	50,282
Other Residential Real Estate | Real Estate Mortgage | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,095,698			3,095,698		2,760,386
Other Residential Real Estate | Finance Receivable Allowance | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0		232	0	232
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Other Residential Real Estate | No Finance Receivable Allowance | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Multifamily | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	841			841		22,763
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	6,124,673			6,124,673		6,009,507
Loans held for investment, net	6,124,673			6,124,673		6,041,713
Financing Receivable, Nonaccrual, No Allowance	841		916	841	916
Multifamily | Real Estate Mortgage | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	6,123,832			6,123,832		6,018,950
Multifamily | Finance Receivable Allowance | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0		0	0	0
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Multifamily | No Finance Receivable Allowance | Real Estate Mortgage
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0			0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	395,150			395,150		799,131
Loans held for investment, net	395,150			395,150		799,131
Financing Receivable, Nonaccrual, No Allowance	0		0	0	0
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	395,150			395,150		799,131
Commercial Real Estate Construction Loan Receivable | Finance Receivable Allowance | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0		0	0	0
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Commercial Real Estate Construction Loan Receivable | No Finance Receivable Allowance | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0			0		0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,759,676			1,759,676		2,373,162
Loans held for investment, net	1,759,676			1,759,676		2,373,162
Financing Receivable, Nonaccrual, No Allowance	0		0	0	0
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,759,676			1,759,676		2,373,162
Residential Real Estate Construction Financing Receivable | Finance Receivable Allowance | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0		0	0	0
Financing Receivable, Nonaccrual, Interest Income	0		0		0
Leased equipment depreciation				0
Residential Real Estate Construction Financing Receivable | No Finance Receivable Allowance | Real Estate Construction and Land
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Venture Capital Loans | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0			0		6,291
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,907,601			1,907,601		1,532,242
Loans held for investment, net	1,907,601			1,907,601		1,537,776
Financing Receivable, Nonaccrual, No Allowance	0		0	0	0
Venture Capital Loans | Commercial | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,907,601			1,907,601		1,531,485
Venture Capital Loans | Finance Receivable Allowance | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	0		19,957	0	19,957
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Venture Capital Loans | No Finance Receivable Allowance | Commercial
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Other Commercial
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, No Allowance	4,980		8,712	4,980	8,712
Other Commercial | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	6,676			6,676		13,544
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,351,874			3,351,874		3,142,833
Loans held for investment, net	3,356,537			3,356,537		3,153,084
Other Commercial | Commercial | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,349,861			3,349,861		3,139,540
Other Commercial | Finance Receivable Allowance | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	1,696		6,950	1,696	6,950
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Other Commercial | No Finance Receivable Allowance
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Asset Based | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	103			103		1,940
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,742,519			2,742,519		2,086,174
Loans held for investment, net	2,742,519			2,742,519		2,087,969
Financing Receivable, Nonaccrual, No Allowance	0		2,295	0	2,295
Asset Based | Commercial | Performing
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,742,416			2,742,416		$ 2,086,029
Asset Based | Finance Receivable Allowance | Commercial
Financing Receivable, Nonaccrual [Line Items]
Nonaccrual	103		0	103	0
Financing Receivable, Nonaccrual, Interest Income	0		0	0	0
Asset Based | No Finance Receivable Allowance | Commercial
Financing Receivable, Nonaccrual [Line Items]
Financing Receivable, Nonaccrual, Interest Income	$ 0		$ 0	$ 0	$ 0

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