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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail) $ in Thousands |  |  | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2021 USD ($) Loan Commitment | Dec. 31, 2020 USD ($) Commitment | Dec. 31, 2021 USD ($) Loan Commitment | Dec. 31, 2020 USD ($) Commitment Loan | Dec. 31, 2019 USD ($) Loan Commitment | Jan. 01, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Accrued interest | $ 81,600 | $ 76,600 | $ 81,600 | $ 76,600 |  |
Financing receivable, excluding accrued interest, after allowance for credit loss | 14,414,827 | 15,608,989 | $ 14,414,827 | 15,608,989 |  |
Loans held for sale, average life from purchase to sale (days) |  |  | 30 days |  |  |
Loans and leases receivable | 9,018,298 | 7,575,368 | $ 9,018,298 | 7,575,368 |  |
Interest income |  |  | 736,822 | 512,048 | $ 431,491 |
Financing receivable, allowance for credit loss, excluding accrued interest | 137,804 | 144,176 | 137,804 | 144,176 | 56,379 | $ 136,200
Allowance for credit loss, period increase (decrease) |  |  | (6,400) | 8,000 |  |
Troubled debt restructurings | $ 16,500 | $ 16,100 | $ 16,500 | $ 16,100 | $ 13,300 |
Minimum performance requirement (months) |  |  | 6 months |  |  |
Contractual terms for loans (months) |  |  | 6 months |  |  |
Number of loans | Loan |  |  | 202 | 121 | 28 |
Commitments to lend additional funds to debtors | Commitment | 0 | 0 | 0 | 0 | 0 |
Purchased-credit-impaired loans | $ 9,900 | $ 13,400 |  |  |  |
Loans pledged as collateral | 3,700,000 | 8,500,000 | $ 3,700,000 | $ 8,500,000 |  |
Troubled Debt Restructurings |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Contractual terms for loans (months) |  |  | 9 months |  |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Loans and leases receivable | $ 3,300,000 | 4,600,000 | $ 3,300,000 | 4,600,000 |  |
Interest income |  |  | $ 279,200 | 65,500 |  |
Collateral-dependent loans |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans | Loan | 2 |  | 2 |  |  |
Commercial real estate non-owner occupied |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Amount deferred, CARES Act | $ 0 | 202,100 | $ 0 | 202,100 |  |
Consumer loans |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Amount deferred, CARES Act | 6,100 | 16,400 | $ 6,100 | $ 16,400 |  |
Principal Forgiveness |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Number of loans | Loan |  |  | 0 | 0 | 0 |
Commercial Real Estate | Commercial and industrial | Collateral-dependent loans |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Financing receivable, excluding accrued interest, after allowance for credit loss | $ 38,900 | 59,500 | $ 38,900 | $ 59,500 |  |
Government-Guaranteed Collateral | Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |
Loans pledged as collateral |  | $ 4,600,000 |  | $ 4,600,000 |  |

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