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Loans and Leases Held for Investment - Credit Risk Rating Categories for Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024	Sep. 30, 2024
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	$ 23,949,274	$ 23,601,470
Loans held for investment, net	24,110,642	23,781,663	$ 23,527,777
Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	13,426,742	13,268,343
Loans held for investment, net	13,579,862	13,427,659	13,334,406
Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,154,826	3,172,293
Loans held for investment, net	2,154,826	3,172,293	3,459,409
Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	8,001,994	6,761,249
Loans held for investment, net	8,006,657	6,778,829	6,319,472
Consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	365,712	399,585
Loans held for investment, net	369,297	402,882	$ 414,490
Classified
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	763,582	563,502
Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	547,583	462,435
Classified | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,985	0
Classified | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	211,634	100,358
Classified | Consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,380	709
Special Mention
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	505,979
Loans held for investment, net		1,097,315
Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	263,281
Loans held for investment, net		565,055
Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	89,676
Loans held for investment, net		351,244
Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	147,334
Loans held for investment, net		173,608
Special Mention | Consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	5,688
Loans held for investment, net		7,408
Pass
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		22,120,846
Loans held for investment, net	22,841,081
Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		12,400,169
Loans held for investment, net	12,768,998
Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		2,821,049
Loans held for investment, net	2,062,165
Pass | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		6,504,863
Loans held for investment, net	7,647,689
Pass | Consumer
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		394,765
Loans held for investment, net	362,229
Venture Capital Loans | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,907,601	1,532,242
Loans held for investment, net	1,907,601	1,537,776
Venture Capital Loans | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	123,392	75,406
Venture Capital Loans | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	103,725
Loans held for investment, net		125,320
Venture Capital Loans | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		1,337,050
Loans held for investment, net	1,680,484
Other Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,351,874	3,142,833
Loans held for investment, net	3,356,537	3,153,084
Other Commercial | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	16,865	19,949
Other Commercial | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	36,466
Loans held for investment, net		38,741
Other Commercial | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		3,094,394
Loans held for investment, net	3,303,206
Asset Based | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,742,519	2,086,174
Loans held for investment, net	2,742,519	2,087,969
Asset Based | Classified | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	71,377	5,003
Asset Based | Special Mention | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	7,143
Loans held for investment, net		9,547
Asset Based | Pass | Commercial
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		2,073,419
Loans held for investment, net	2,663,999
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	395,150	799,131
Loans held for investment, net	395,150	799,131
Commercial Real Estate Construction Loan Receivable | Classified | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	0	0
Commercial Real Estate Construction Loan Receivable | Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	81,400
Loans held for investment, net		148,024
Commercial Real Estate Construction Loan Receivable | Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		651,107
Loans held for investment, net	313,750
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	1,759,676	2,373,162
Loans held for investment, net	1,759,676	2,373,162
Residential Real Estate Construction Financing Receivable | Classified | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	2,985	0
Residential Real Estate Construction Financing Receivable | Special Mention | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	8,276
Loans held for investment, net		203,220
Residential Real Estate Construction Financing Receivable | Pass | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		2,169,942
Loans held for investment, net	1,748,415
Commercial | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	4,238,197	4,528,511
Loans held for investment, net	4,292,625	4,578,772
Commercial | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	298,208	301,278
Commercial | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	109,921
Loans held for investment, net		348,014
Commercial | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		3,929,480
Loans held for investment, net	3,884,496
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	3,063,872	2,730,325
Loans held for investment, net	3,162,564	2,807,174
Other Residential Real Estate | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	66,944	47,993
Other Residential Real Estate | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	0
Loans held for investment, net		14,351
Other Residential Real Estate | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		2,744,830
Loans held for investment, net	3,095,620
Multifamily | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	6,124,673	6,009,507
Loans held for investment, net	6,124,673	6,041,713
Multifamily | Classified | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	182,431	113,164
Multifamily | Special Mention | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current	153,360
Loans held for investment, net		202,690
Multifamily | Pass | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, Current		5,725,859
Loans held for investment, net	$ 5,788,882
Non Purchased Credit Impaired Loans and Leases
Financing Receivable, Past Due [Line Items]
Loans held for investment, net		$ 23,781,663

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

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