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Loans and Leases - Composition of Loan and Lease Portfolio (Parenthetical) (Details) - USD ($) $ in Thousands | 9 Months Ended |
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | $ 42,767,551 | $ 41,844,019
Deferred loan origination fees |  | 1,700 |
Other Assets |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Accrued interest receivable |  | 217,800 | 116,900
Lease Financing, Unearned Income |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Unearned income |  | 121,168 | 104,826
Non-Covered Loans |  | 1,771,168 | 1,271,998
Commercial and Industrial |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans | [1],[2] | 3,416,040 | 3,014,378
Commercial and Industrial | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | 1,644,872 | 1,742,380
Commercial and Industrial | Specialty Finance Loans | Other loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | 3,100,000 | 2,600,000
Commercial and Industrial | Other Commercial and Industrial Loans |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Non-Covered Loans |  | $ 394,300 | $ 420,100
[1] | Includes lease financing receivables, all of which were classified as Pass
[2] | Includes specialty finance loans and leases of $3.1 billion and $2.6 billion, respectively, at September 30, 2020 and December 31, 2019, and other C&I loans of $394.3 million and $420.1 million, respectively, at September 30, 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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes 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 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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