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v3.23.3

Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2023 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) loan | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) loan | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Accrued interest |  | $ 96,800,000 |  | $ 96,800,000 |  |  | $ 105,500,000 |  |
Loans receivable, excluding accrued interest |  | 13,423,901,000 |  | $ 13,423,901,000 |  |  | 15,335,435,000 |  |
Loans held for sale, average life from purchase to sale |  |  |  | 30 days |  |  |  |  |
Loans and leases receivable |  | 12,463,485,000 |  | $ 12,463,485,000 |  |  | 13,144,894,000 |  |
Allowance for credit loss, excluding accrued interest |  | 139,213,000 | $ 130,197,000 | 139,213,000 | $ 130,197,000 | $ 139,656,000 | 130,924,000 | $ 156,530,000 | $ 137,804,000
Allowance for credit loss, period increase |  |  |  | 8,300,000 |  |  |  |  |
Number of commitments to lend additional funds (commitment) |  | 0 |  | 0 |  |  | 0 |  |
Loans reported as TDR |  |  |  |  |  |  | 16,800,000 |  |
Number of loans | loan |  |  | 71 |  | 184 |  |  |  |
Purchases |  | 101,735,000 | $ 137,814,000 | 750,400,000 | $ 368,776,000 |  |  |  |
Loans and leases receivable, charge-offs |  | 30,020,000 | 21,484,000 | 69,713,000 | 45,935,000 |  |  |  |
Legal settlement expense |  | 4,096,000 | $ 0 | 4,096,000 | $ 0 |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases receivable |  | 8,500,000,000 |  | 8,500,000,000 |  |  | 7,100,000,000 |  |
Forgiveness of debt |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan |  |  | 0 |  | 0 |  |  |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases receivable |  | 137,100,000 |  | 137,100,000 |  |  | 998,200,000 |  |
Interest income |  | 600,000 | $ 14,700,000 | 25,800,000 | $ 72,100,000 |  |  |  |
Loans and leases receivable, charge-offs |  |  |  | 7,000,000 |  |  |  |  |
Specialty lending | FDIC |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Purchases | $ 631,000,000 |  |  |  |  |  |  |  |
Specialty lending |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Purchases |  | 0 | $ 0 | 631,252,000 | $ 0 |  |  |  |
Commercial Real Estate | Other commercial and industrial | Collateral Dependent Loan |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable, excluding accrued interest |  | $ 18,400,000 |  | $ 18,400,000 |  |  | $ 11,500,000 |  |

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