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Loans and Leases - Composition of Loan and Lease Portfolio (Parenthetical) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | $ 43,061,670 |  |  | $ 42,821,790 | [1] | $ 41,844,019 | [1]
Deferred loan origination fees | 3,800 |  | $ 1,700 | 1,700 |  |  |
Other Assets |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Accrued interest receivable | 219,000 |  |  | 219,100 |  | 116,900 |
Lease Financing, Unearned Income |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Unearned income | 110,582 |  |  | 116,366 |  | 104,826 |
Non-Covered Loans | 1,898,980 |  |  | 1,734,824 |  | 1,271,998 |
Commercial and Industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | 3,509,530 | [2] |  | 3,417,343 | [2],[3],[4] | 3,014,378 | [3],[4]
Commercial and Industrial | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | 1,610,550 |  |  | 1,682,519 |  | 1,742,380 |
Commercial and Industrial | Specialty Finance Loans | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | 3,200,000 |  |  | 3,000,000 |  | 2,600,000 |
Commercial and Industrial | Other Commercial and Industrial Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | $ 350,800 |  |  | $ 393,300 |  | $ 420,100 |
[1] | Excludes accrued interest receivable of $219.1 million and $116.9 million at December 31, 2020 and December 31, 2019, respectively, which is included in other assets in the Consolidated Statements of Condition.
[2] | Includes specialty finance loans and leases of $3.2 billion and $3.0 billion, respectively, at March 31, 2021 and December 31, 2020, and other C&I loans of $350.8 million and $393.3 million, respectively, at March 31, 2021 and December 31, 2020.
[3] | Includes lease financing receivables, all of which were classified as Pass.
[4] | Includes specialty finance loans and leases of $3.0 billion and $2.6 billion, respectively, at December 31, 2020 and December 31, 2019, and other C&I loans of $393.3 million and $420.1 million, respectively, at December 31, 2020 and December 31, 2019.

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- Definition The net increase(decrease) in interest income during the period representing the allocation of deferred loan origination fees less deferred loan origination costs using the effective interest method over the term of the debt arrangement to which they pertain taking into account the effect of prepayments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121604886&loc=d3e8622-111531 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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- Definition Amount of deferred interest and fee income, unamortized costs incurred to originate loans and leases, unamortized loan commitments and loan syndication fees, and premiums over or discounts from face amounts of acquired loans. Excludes amounts for loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.7) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=121568338&loc=d3e45377-112738 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=121611835&loc=d3e5074-111524 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159169&loc=d3e10152-111534 + Details
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