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Loans and Leases - Aging Analysis of Loans and Leases Held for Investment (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023
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Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | $ 23,228,909 | $ 25,489,687 | $ 22,258,210
Financing Receivable Recorded Investment Total Past Due | 83,754 | 144,188 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 23,145,155 | 25,345,499 |
30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 27,962 | 113,307 |
90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 55,792 | 30,881 |
Real Estate Mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 13,573,600 | 16,111,985 | 14,288,042
Financing Receivable Recorded Investment Total Past Due | 68,119 | 128,491 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 13,505,481 | 15,983,494 |
Real Estate Mortgage | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 20,600 | 107,962 |
Real Estate Mortgage | 90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 47,519 | 20,529 |
Real Estate Construction and Land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 3,357,597 | 3,159,269 | 2,465,523
Financing Receivable Recorded Investment Total Past Due | 0 | 0 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 3,357,597 | 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 | 5,871,809 | 5,765,307 | 5,094,786
Financing Receivable Recorded Investment Total Past Due | 12,404 | 11,566 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 5,859,405 | 5,753,741 |
Commercial | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 4,814 | 1,884 |
Commercial | 90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 7,590 | 9,682 |
Consumer |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 425,903 | 453,126 | $ 409,859
Financing Receivable Recorded Investment Total Past Due | 3,231 | 4,131 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 422,672 | 448,995 |
Consumer | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 2,548 | 3,461 |
Consumer | 90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 683 | 670 |
Asset Based [Member] | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 1,968,713 | 2,189,085 |
Financing Receivable Recorded Investment Total Past Due | 1,613 | 3,297 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 1,967,100 | 2,185,788 |
Asset Based [Member] | Commercial | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 0 | 608 |
Asset Based [Member] | Commercial | 90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 1,613 | 2,689 |
Venture Capital Loans | Commercial |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 1,456,122 | 1,446,362 |
Financing Receivable Recorded Investment Total Past Due | 1,545 | 0 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 1,454,577 | 1,446,362 |
Venture Capital Loans | Commercial | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 1,545 | 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 | 2,446,974 | 2,129,860 |
Financing Receivable Recorded Investment Total Past Due | 9,246 | 8,269 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 2,437,728 | 2,121,591 |
Other Commercial | Commercial | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 3,269 | 1,276 |
Other Commercial | Commercial | 90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 5,977 | 6,993 |
Commercial Real Estate Construction Loan Receivable | Real Estate Construction and Land |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 784,166 | 759,585 |
Financing Receivable Recorded Investment Total Past Due | 0 | 0 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 784,166 | 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 | 2,573,431 | 2,399,684 |
Financing Receivable Recorded Investment Total Past Due | 0 | 0 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 2,573,431 | 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 | 4,722,585 | 5,026,497 |
Financing Receivable Recorded Investment Total Past Due | 28,613 | 27,786 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 4,693,972 | 4,998,711 |
Commercial | Real Estate Mortgage | 30 TO 89 Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
30-89 Days Past Due | 189 | 12,618 |
Commercial | Real Estate Mortgage | 90 Or More Days Past Due |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
90 or More Days Past Due | 28,424 | 15,168 |
Multi-Family Real Estate Loans | Real Estate Mortgage |  |  |
Financing Receivable, Past Due [Line Items] |  |  |
Loans held for investment, net | 5,984,930 | 6,025,179 |
Financing Receivable Recorded Investment Total Past Due | 227 | 3,322 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 5,984,703 | 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 | 227 | 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 | 2,866,085 | 5,060,309 |
Financing Receivable Recorded Investment Total Past Due | 39,279 | 97,383 |
Loans And Leases Receivable Net Of Deferred Income, Not Past Due | 2,826,806 | 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 | 20,184 | 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 | $ 19,095 | $ 4,341 |

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