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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
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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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