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Loans and Leases Receivable and Allowance for Credit Losses - Additional Information (Detail) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 USD ($) Commitment | Jan. 01, 2020 USD ($) | Sep. 30, 2020 USD ($) Commitment | Sep. 30, 2020 USD ($) Loan Commitment | Sep. 30, 2019 USD ($) Loan | Jun. 30, 2020 USD ($) | Sep. 30, 2020 USD ($) Loan Commitment | Sep. 30, 2019 USD ($) Loan | Dec. 31, 2019 USD ($) Commitment | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued interest receivable | $ 65,668,000 |  | $ 65,668,000 | $ 65,668,000 |  |  | $ 65,668,000 |  | $ 38,072,000 |  |
Loans receivable | 16,423,029,000 |  | 16,423,029,000 | 16,423,029,000 |  |  | 16,423,029,000 |  | 9,508,367,000 |  |
Interest income |  |  |  | 132,107,000 | $ 118,444,000 |  | $ 366,634,000 | $ 315,126,000 |  |  |
Loans held for sale, average life from purchase to sale |  |  |  |  |  |  | 30 days |  |  |  |
Accrued interest reversed |  |  |  |  |  |  | $ 1,200,000 |  |  |  |
Allowance for credit losses on loans and leases | 155,561,000 | $ 136,200,000 | 155,561,000 | 155,561,000 | $ 51,053,000 | $ 159,905,000 | 155,561,000 | $ 51,053,000 | 56,379,000 | $ 48,388,000 | $ 39,972,000
Allowance for credit loss, period increase |  |  |  |  |  |  | 19,400,000 |  |  |  |
Loans reported as TDR | 16,100,000 |  | 16,100,000 | 16,100,000 |  |  | $ 16,100,000 |  | 13,300,000 |  |
Minimum performance requirement |  |  |  |  |  |  | 9 months |  |  |  |
Lease receivable, TDR | $ 0 |  | $ 0 | $ 0 |  |  | $ 0 |  | $ 0 |  |
Number of loans | Loan |  |  |  | 67 | 7 |  | 105 | 21 |  |  |
Number of commitments to lend additional funds (commitment) | Commitment | 0 |  | 0 | 0 |  |  | 0 |  | 0 |  |
Purchased-credit-impaired loans | $ 14,400,000 |  |  |  |  | 17,488,000 |  |  |  |  |
Financing receivable sale |  |  |  | $ 21,568,000 | $ 0 |  | $ 23,390,000 | $ 0 |  |  |
Loans pledged as collateral | 8,900,000,000 |  | $ 8,900,000,000 | 8,900,000,000 |  |  | 8,900,000,000 |  | $ 4,600,000,000 |  |
Small Business Administration (SBA), CARES Act, Paycheck Protection Program |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable | 5,000,000,000.0 |  | 5,000,000,000.0 | 5,000,000,000.0 |  |  | 5,000,000,000.0 |  |  |  |
Interest income |  |  |  | 24,300,000 |  |  | 36,000,000.0 |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Initial allowance on loans purchased with credit deterioration |  | 200,000 |  |  |  |  |  |  |  |  |
Financing receivable, purchased with credit deterioration, discount |  | $ 300,000 |  |  |  |  |  |  |  |  |
Residential real estate |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Residential real estate held in other real estate owned | 100,000 |  | 100,000 | 100,000 |  |  | 100,000 |  | 200,000 |  |
Loans in process of foreclosure | 500,000 |  | 500,000 | 500,000 |  |  | 500,000 |  | 900,000 |  |
Commercial and industrial |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Financing receivable sale |  |  |  | 3,968,000 | 0 |  | 3,968,000 | 0 |  |  |
Commercial real estate non-owner occupied |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount deferred, CARES Act | 79,000,000.0 |  | 79,000,000.0 | 79,000,000.0 |  |  | 79,000,000.0 |  |  |  |
Financing receivable sale |  |  | 17,600,000 |  |  |  |  |  |  |  |
Multi-family |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Allowance for credit losses on loans and leases | 15,026,000 |  | 15,026,000 | 15,026,000 | $ 7,498,000 | 14,697,000 | 15,026,000 | $ 7,498,000 | 6,157,000 | $ 9,926,000 | $ 11,462,000
Purchased-credit-impaired loans |  |  |  |  |  | $ 1,688,000 |  |  |  |  |
Consumer loans |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amount deferred, CARES Act | 25,000,000.0 |  | 25,000,000.0 | $ 25,000,000.0 |  |  | $ 25,000,000.0 |  |  |  |
Forgiveness of debt |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of loans | Loan |  |  |  | 0 | 0 |  | 0 | 0 |  |  |
Other Assets |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Accrued interest receivable | 61,900,000 |  | 61,900,000 | $ 61,900,000 |  |  | $ 61,900,000 |  | $ 34,800,000 |  |
Commercial Real Estate | Commercial and industrial | Collateral Dependent Loan |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans receivable | 32,100,000 |  | 32,100,000 | 32,100,000 |  |  | 32,100,000 |  |  |  |
Government-Guaranteed Collateral |  |  |  |  |  |  |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |  |  |  |  |  |  |
Loans pledged as collateral | $ 4,800,000,000 |  | $ 4,800,000,000 | $ 4,800,000,000 |  |  | $ 4,800,000,000 |  |  |  |

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