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Loans and Leases - Nonaccrual and Performing Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024
Financing Receivable, Impaired [Line Items]
Nonaccrual	$ 213,480	$ 189,605	$ 145,785
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	23,925,887	23,601,470
Loans held for investment, net	24,126,527	23,781,663	25,473,022
Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	198,948	167,206	129,234
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,303,254	13,268,343
Loans held for investment, net	13,492,658	13,427,659	15,967,399
Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,861,038	3,172,293
Loans held for investment, net	2,861,038	3,172,293	3,245,354
Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	13,540	21,775	15,715
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	7,370,539	6,761,249
Loans held for investment, net	7,378,799	6,778,829	5,820,567
Consumer
Financing Receivable, Impaired [Line Items]
Nonaccrual	992	624	836
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	391,056	399,585
Loans held for investment, net	394,032	402,882	$ 439,702
Performing
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	23,913,047	23,592,058
Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,293,710	13,260,453
Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,861,038	3,172,293
Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	7,365,259	6,757,054
Performing | Consumer
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	393,040	402,258
Venture Capital Loans | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	163	6,291
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,733,074	1,532,242
Loans held for investment, net	1,733,074	1,537,776
Venture Capital Loans | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,732,911	1,531,485
Other Commercial | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	9,737	13,544
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,333,657	3,142,833
Loans held for investment, net	3,340,400	3,153,084
Other Commercial | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,330,663	3,139,540
Asset Based | Commercial
Financing Receivable, Impaired [Line Items]
Nonaccrual	3,640	1,940
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,303,808	2,086,174
Loans held for investment, net	2,305,325	2,087,969
Asset Based | Performing | Commercial
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,301,685	2,086,029
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	733,684	799,131
Loans held for investment, net	733,684	799,131
Commercial Real Estate Construction Loan Receivable | Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	733,684	799,131
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Nonaccrual	0	0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,127,354	2,373,162
Loans held for investment, net	2,127,354	2,373,162
Residential Real Estate Construction Financing Receivable | Performing | Real Estate Construction and Land
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,127,354	2,373,162
Commercial | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	131,595	97,655
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,397,443	4,528,511
Loans held for investment, net	4,489,543	4,578,772
Commercial | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,357,948	4,481,117
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	22,614	22,763
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	6,192,555	6,009,507
Loans held for investment, net	6,216,084	6,041,713
Multi-Family Real Estate Loans | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	6,193,470	6,018,950
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Nonaccrual	44,739	46,788
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,713,256	2,730,325
Loans held for investment, net	2,787,031	2,807,174
Other Residential Real Estate | Performing | Real Estate Mortgage
Financing Receivable, Impaired [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	$ 2,742,292	$ 2,760,386

X

- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 326
-SubTopic 20
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- Definition

Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable classified as current. Excludes net investment in lease.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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