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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023	Sep. 30, 2023
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	$ 23,527,777	$ 25,489,687	$ 21,920,946
Financing Receivable Recorded Investment Total Past Due	124,964	144,188
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	23,402,813	25,345,499
30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	52,927	113,307
90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	72,037	30,881
Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	13,334,406	16,111,985	14,034,491
Financing Receivable Recorded Investment Total Past Due	105,922	128,491
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	13,228,484	15,983,494
Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	36,964	107,962
Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	68,958	20,529
Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	3,459,409	3,159,269	2,737,537
Financing Receivable Recorded Investment Total Past Due	0	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	3,459,409	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	0	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	6,319,472	5,765,307	4,754,430
Financing Receivable Recorded Investment Total Past Due	16,183	11,566
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	6,303,289	5,753,741
Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	13,514	1,884
Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	2,669	9,682
Consumer
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	414,490	453,126	$ 394,488
Financing Receivable Recorded Investment Total Past Due	2,859	4,131
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	411,631	448,995
Consumer | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	2,449	3,461
Consumer | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	410	670
Asset Based [Member] | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	2,115,311	2,189,085
Financing Receivable Recorded Investment Total Past Due	1,097	3,297
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,114,214	2,185,788
Asset Based [Member] | Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	1,097	608
Asset Based [Member] | Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	0	2,689
Venture Capital Loans | Commercial
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	1,353,626	1,446,362
Financing Receivable Recorded Investment Total Past Due	0	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	1,353,626	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	2,850,535	2,129,860
Financing Receivable Recorded Investment Total Past Due	15,086	8,269
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,835,449	2,121,591
Other Commercial | Commercial | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	12,417	1,276
Other Commercial | Commercial | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	2,669	6,993
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	836,902	759,585
Financing Receivable Recorded Investment Total Past Due	0	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	836,902	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	2,622,507	2,399,684
Financing Receivable Recorded Investment Total Past Due	0	0
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,622,507	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	0	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	4,557,939	5,026,497
Financing Receivable Recorded Investment Total Past Due	46,673	27,786
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	4,511,266	4,998,711
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due
Financing Receivable, Past Due [Line Items]
30-89 Days Past Due	17,261	12,618
Commercial | Real Estate Mortgage | 90 Or More Days Past Due
Financing Receivable, Past Due [Line Items]
90 or More Days Past Due	29,412	15,168
Multi-Family Real Estate Loans | Real Estate Mortgage
Financing Receivable, Past Due [Line Items]
Loans held for investment, net	6,009,280	6,025,179
Financing Receivable Recorded Investment Total Past Due	0	3,322
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	6,009,280	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	0	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	2,767,187	5,060,309
Financing Receivable Recorded Investment Total Past Due	59,249	97,383
Loans And Leases Receivable Net Of Deferred Income, Not Past Due	2,707,938	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	19,703	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	$ 39,546	$ 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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