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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Detail) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2022 USD ($) loan commitment | Mar. 31, 2021 USD ($) loan | Dec. 31, 2021 USD ($) commitment | Dec. 31, 2020 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Accrued interest | $ 80,700,000 |  | $ 81,600,000 |
Loans receivable, excluding accrued interest | $ 13,924,668,000 |  | 14,414,827,000 |
Loans held for sale, average life from purchase to sale | 30 days |  |  |
Loans and leases receivable | $ 10,118,855,000 |  | 9,018,298,000 |
Interest income | 157,175,000 | $ 152,117,000 |  |
Allowance for credit loss, excluding accrued interest | 145,847,000 | $ 128,736,000 | 137,804,000 | $ 144,176,000
Allowance for credit loss, period increase | 8,000,000 |  |  |
Loans reported as TDR | $ 16,600,000 |  | 16,500,000 |
Minimum performance requirement (months) | 6 months |  |  |
Lease receivable, TDR | $ 0 |  | $ 0 |
Number of loans | loan | 42 | 28 |  |
Number of commitments to lend additional funds (commitment) | commitment | 0 |  | 0 |
Loans pledged as collateral | $ 3,600,000,000 |  | $ 3,700,000,000 |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans and leases receivable | 2,200,000,000 |  | 3,300,000,000 |
Interest income | $ 36,900,000 | $ 38,800,000 |  |
Troubled Debt Restructurings |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Impairment modification minimum period (months) | 9 months |  |  |
Commercial real estate non-owner occupied |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amount deferred, CARES Act | $ 3,300,000 |  |  |
Consumer loans |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Amount deferred, CARES Act |  |  | 6,100,000 |
Forgiveness of debt |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Number of loans | loan | 0 | 0 |  |
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |
Loans receivable, excluding accrued interest | $ 31,800,000 |  | $ 38,900,000 |

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- Definition The aggregate interest and fee income generated by: (1) loans the Entity has positive intent and ability to hold for the foreseeable future, or until maturity or payoff, including commercial and consumer loans, whether domestic or foreign, which may consist of: (a) industrial and agricultural; (b) real estate; and (c) real estate construction loans; (d) trade financing; (e) lease financing; (f) home equity lines-of-credit; (g) automobile and other vehicle loans; and (h) credit card and other revolving-type loans and (2) loans and leases held-for-sale which may include mortgage loans, direct financing, and sales-type leases. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 220 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.1) -URI http://asc.fasb.org/extlink&oid=120399700&loc=SL114874048-224260 + Details
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