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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) commitment | Sep. 30, 2022 USD ($) commitment loan | Sep. 30, 2021 USD ($) loan | Sep. 30, 2022 USD ($) loan commitment | Sep. 30, 2021 USD ($) loan | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($) commitment | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Accrued interest | $ 92,000,000 | $ 92,000,000 |  | $ 92,000,000 |  |  | $ 81,600,000 |  |
Loans receivable, excluding accrued interest | 15,201,267,000 | 15,201,267,000 |  | $ 15,201,267,000 |  |  | 14,414,827,000 |  |
Loans held for sale, average life from purchase to sale |  |  |  | 30 days |  |  |  |  |
Loans and leases receivable | 12,607,742,000 | 12,607,742,000 |  | $ 12,607,742,000 |  |  | 9,018,298,000 |  |
Interest income |  | 200,457,000 | $ 233,097,000 | 526,573,000 | $ 538,822,000 |  |  |  |
Allowance for credit loss, excluding accrued interest | 130,197,000 | 130,197,000 | $ 131,496,000 | 130,197,000 | $ 131,496,000 | $ 156,530,000 | 137,804,000 | $ 125,436,000 | $ 144,176,000
Allowance for credit loss, period increase |  |  |  | 7,600,000 |  |  |  |  |
Loans reported as TDR | 16,900,000 | 16,900,000 |  | $ 16,900,000 |  |  | 16,500,000 |  |
Minimum performance requirement (months) |  |  |  | 6 months |  |  |  |  |
Lease receivable, TDR | $ 0 | $ 0 |  | $ 0 |  |  | $ 0 |  |
Number of loans | loan |  | 71 | 43 | 184 | 174 |  |  |  |
Number of commitments to lend additional funds (commitment) | commitment | 0 | 0 |  | 0 |  |  | 0 |  |
Proceeds from sales of loans and leases | $ 100,700,000 |  |  | $ 136,920,000 | $ 260,851,000 |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases receivable | 6,600,000,000 | $ 6,600,000,000 |  | $ 6,600,000,000 |  |  | $ 3,700,000,000 |  |
Forgiveness of debt |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Number of loans | loan |  | 0 | 0 | 0 | 0 |  |  |  |
Troubled Debt Restructurings |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Impairment modification minimum period (months) |  |  |  | 9 months |  |  |  |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Loans and leases receivable | 1,200,000,000 | $ 1,200,000,000 |  | $ 1,200,000,000 |  |  | 3,300,000,000 |  |
Interest income |  | 14,700,000 | $ 117,100,000 | 72,100,000 | $ 197,100,000 |  |  |  |
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |
Loans receivable, excluding accrued interest | $ 32,000,000 | $ 32,000,000 |  | $ 32,000,000 |  |  | $ 38,900,000 |  |

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