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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 25,473,022	$ 25,489,687	$ 25,672,381
Financing Receivable Recorded Investment Total Past Due	235,994	144,188
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	25,237,028	25,345,499
30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	178,421	113,307
90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	57,573	30,881
Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	15,967,399	16,111,985	15,407,611
Financing Receivable Recorded Investment Total Past Due	199,641	128,491
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	15,767,758	15,983,494
Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	153,417	107,962
Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	46,224	20,529
Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,245,354	3,159,269	4,608,440
Financing Receivable Recorded Investment Total Past Due	4,606	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	3,240,748	3,159,269
Real Estate Construction and Land | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	4,606	0
Real Estate Construction and Land | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	0	0
Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	5,820,567	5,765,307	5,229,107
Financing Receivable Recorded Investment Total Past Due	28,353	11,566
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	5,792,214	5,753,741
Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	17,588	1,884
Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	10,765	9,682
Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	439,702	453,126	$ 427,223
Financing Receivable Recorded Investment Total Past Due	3,394	4,131
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	436,308	448,995
Consumer | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	2,810	3,461
Consumer | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	584	670
Asset Based [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,061,016	2,189,085
Financing Receivable Recorded Investment Total Past Due	14,026	3,297
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,046,990	2,185,788
Asset Based [Member] | Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	11,701	608
Asset Based [Member] | Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	2,325	2,689
Venture Capital Loans | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,513,641	1,446,362
Financing Receivable Recorded Investment Total Past Due	0	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	1,513,641	1,446,362
Venture Capital Loans | Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	0	0
Venture Capital Loans | Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	0	0
Other Commercial | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,245,910	2,129,860
Financing Receivable Recorded Investment Total Past Due	14,327	8,269
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,231,583	2,121,591
Other Commercial | Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	5,887	1,276
Other Commercial | Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	8,440	6,993
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	775,021	759,585
Financing Receivable Recorded Investment Total Past Due	0	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	775,021	759,585
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	0	0
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	0	0
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,470,333	2,399,684
Financing Receivable Recorded Investment Total Past Due	4,606	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,465,727	2,399,684
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	4,606	0
Residential Real Estate Construction Financing Receivable | Real Estate Construction and Land | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	0	0
Commercial | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,896,544	5,026,497
Financing Receivable Recorded Investment Total Past Due	76,041	27,786
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	4,820,503	4,998,711
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	69,213	12,618
Commercial | Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	6,828	15,168
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,121,472	6,025,179
Financing Receivable Recorded Investment Total Past Due	9,046	3,322
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	6,112,426	6,021,857
Multi-Family Real Estate Loans | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	9,046	2,302
Multi-Family Real Estate Loans | Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	0	1,020
Other Residential Real Estate | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	4,949,383	5,060,309
Financing Receivable Recorded Investment Total Past Due	114,554	97,383
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	4,834,829	4,962,926
Other Residential Real Estate | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	75,158	93,042
Other Residential Real Estate | Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	$ 39,396	$ 4,341

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

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