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Loans and Leases - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023 | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | $ 117,070 | $ 104,886 | $ 117,070 | $ 104,886 |  | $ 62,527 |  |
Allowance for Loan and Lease Losses, Period Increase (Decrease) |  |  | (43,700) |  |  |  |  |
Provision for credit losses | 12,000 | 40,000 | 23,000 | (58,500) |  |  |  |
Loans and leases held for investment | 23,472,918 |  | 23,472,918 |  |  | 25,796,714 |  |
Loans and Leases Receivable, Allowance | 247,762 | 219,234 | 247,762 | 219,234 | $ 291,503 | 281,687 | $ 210,055 | $ 200,732
Loans held for investment, net | 23,228,909 | 22,258,210 | 23,228,909 | 22,258,210 |  | 25,489,687 |  |
Net charge-offs | (55,741) | (30,821) | (56,925) | (39,998) |  |  |  |
Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification | 2,155 |  | 3,883 |  |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | 58,070 | 31,708 | 63,084 | 42,105 |  |  |  |
Transfers from loans held for investment to loans held for sale |  |  | 1,915,180 | 3,076,427 |  |  |  |
Civic |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Transfers from loans held for investment to loans held for sale |  |  | 1,900,000 |  |  |  |  |
Civic |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Allowance for Loan and Lease Losses, Write-offs |  |  | 28,700 |  |  |  |  |
Real Estate Mortgage |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 95,264 | 100,817 | 95,264 | 100,817 |  | 47,730 |  |
Provision for credit losses | 9,438 | 47,138 | 22,471 | (78,947) |  |  |  |
Loans and leases held for investment | 13,787,815 |  | 13,787,815 |  |  | 16,378,537 |  |
Loans and Leases Receivable, Allowance | 155,260 | 132,808 | 155,260 | 132,808 | 198,274 | 186,827 | 109,483 | 87,309
Loans held for investment, net | 13,573,600 | 14,288,042 | 13,573,600 | 14,288,042 |  | 16,111,985 |  |
Net charge-offs | (52,452) | (23,813) | (54,038) | (33,448) |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | 53,881 | 23,875 | 56,358 | 33,710 |  |  |  |
Real Estate Mortgage | Other Residential Real Estate |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 31,832 |  | 31,832 |  |  | 31,041 |  |
Loans held for investment, net | 2,866,085 |  | 2,866,085 |  |  | 5,060,309 |  |
Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification | 2,108 | 4,100 | 3,836 | 4,100 |  |  |  |
Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 21,006 | 3,864 | 21,006 | 3,864 |  | 13,986 |  |
Provision for credit losses | 6,454 | 6,631 | 6,187 | (9,861) |  |  |  |
Loans and leases held for investment | 5,882,603 |  | 5,882,603 |  |  | 5,780,346 |  |
Loans and Leases Receivable, Allowance | 51,194 | 37,221 | 51,194 | 37,221 | $ 47,054 | 45,156 | $ 37,195 | $ 52,849
Loans held for investment, net | 5,871,809 | 5,094,786 | 5,871,809 | 5,094,786 |  | 5,765,307 |  |
Net charge-offs | (2,314) | (6,605) | (149) | (5,767) |  |  |  |
Allowance for Loan and Lease Losses, Write-offs | 3,148 | $ 7,347 | 3,852 | $ 7,484 |  |  |  |
Credit Concentration Risk |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 35,900 |  | $ 35,900 |  |  |  |  |
Credit Concentration Risk | Nonaccrual Loans And Leases Benchmark | Fair Value, Concentration of Risk, All Financial Instruments |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of nonaccrual loans and leases |  |  | 31.00% |  |  |  |  |
Nonaccrual |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Receivable, 90 or more days past due | 55,800 |  | $ 55,800 |  |  | 19,100 |  |
Receivable, 30-89 days past due | 2,800 |  | 2,800 |  |  | 11,400 |  |
Financing receivable, nonaccrual status, current | 58,400 |  | 58,400 |  |  | 32,000 |  |
Other Commercial | Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 12,925 |  | 12,925 |  |  | 10,972 |  |
Loans held for investment, net | 2,446,974 |  | 2,446,974 |  |  | 2,129,860 |  |
Financing Receivable, Excluding Accrued Interest, Modified, Increase (Decrease) from Modification | 47 |  | 47 |  |  |  |  |
Venture Capital Loans | Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 0 |  | 0 |  |  | 325 |  |
Loans held for investment, net | 1,456,122 |  | 1,456,122 |  |  | 1,446,362 |  |
Asset Based [Member] | Commercial |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Nonaccrual loans and leases | 8,081 |  | 8,081 |  |  | 2,689 |  |
Loans held for investment, net | $ 1,968,713 |  | $ 1,968,713 |  |  | $ 2,189,085 |  |

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