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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Additional Information (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) loan commitment | Dec. 31, 2021 USD ($) loan commitment | Dec. 31, 2020 USD ($) loan commitment | Jan. 01, 2020 USD ($) | Dec. 31, 2019 USD ($)
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Accrued interest | $ 105,500,000 | $ 81,600,000 |  |  |
Financing receivable, excluding accrued interest, after allowance for credit loss | $ 15,335,435,000 | 14,414,827,000 |  |  |
Loans held for sale, average life from purchase to sale (days) | 30 days |  |  |  |
Loans and leases receivable | $ 13,144,894,000 | 9,018,298,000 |  |  |
Interest income | 745,313,000 | 736,822,000 | $ 512,048,000 |  |
Charge-offs | 77,196,000 | 40,381,000 | 61,736,000 |  |
Legal settlement gain | 7,519,000 | 0 | 0 |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 130,924,000 | 137,804,000 | 144,176,000 | $ 144,200,000 | $ 56,379,000
Allowance for credit loss, period increase (decrease) | 6,900,000 | 6,400,000 |  |  |
Loans reported as TDR | 16,800,000 | 16,500,000 | $ 16,100,000 |  |
Troubled debt restructurings | $ 0 | $ 0 |  |  |
Minimum performance requirement (months) | 6 months |  |  |  |
Contractual terms for loans (months) | 6 months |  |  |  |
Number of loans | loan | 259 | 202 | 121 |  |
Commitments to lend additional funds to debtors | commitment | 0 | 0 | 0 |  |
Financing Receivable, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration] | Accrued interest receivable | Accrued interest receivable |  |  |
Asset Pledged as Collateral |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable | $ 7,100,000,000 | $ 3,700,000,000 |  |  |
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 | $ 1,000,000,000 | 3,300,000,000 |  |  |
Interest income | 79,400,000 | 279,200,000 | $ 65,500,000 |  |
Commercial real estate non-owner occupied |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Amount deferred, CARES Act | 0 | 0 |  |  |
Consumer loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Amount deferred, CARES Act | 0 | 6,100,000 |  |  |
Commercial and industrial, including specialty lending |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable | 6,672,830,000 | 3,424,783,000 |  |  |
Charge-offs | 16,248,000 | 1,550,000 | 3,158,000 |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 17,582,000 | 12,702,000 | 12,239,000 |  | 15,556,000
Commercial and industrial, including specialty lending | Loans Originated Under Small Business Administration (SBA) CARES Act Paycheck Protection Program, Subsequently Determined Ineligible For Forgiveness |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Charge-offs | 11,000,000 |  |  |  |
Commercial real estate non-owner occupied |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Loans and leases receivable | 1,290,730,000 | 1,121,238,000 |  |  |
Charge-offs | 6,075,000 | 944,000 | 25,779,000 |  |
Financing receivable, allowance for credit loss, excluding accrued interest | 11,219,000 | $ 6,210,000 | $ 19,452,000 |  | $ 6,243,000
Commercial real estate non-owner occupied | Performing |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Charge-offs | $ 7,900,000 |  |  |  |
Principal Forgiveness |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Number of loans | loan | 0 | 0 | 0 |  |
Commercial Real Estate | Other commercial and industrial | Collateral-dependent loans |  |  |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |  |  |
Financing receivable, excluding accrued interest, after allowance for credit loss | $ 11,500,000 | $ 38,900,000 |  |  |

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