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Loans and Leases - Composition of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans | [1] | $ 42,821,790 | $ 41,844,019 |
Non-Covered Loans, Percentage | [1] | 100.00% | 100.00% |
Net deferred loan origination costs |  | $ 61,808 | $ 50,136 |
Allowance for loan and lease losses |  | (194,043) | (147,638) | $ (159,820)
Total loans and leases held for investment, net |  | 42,689,555 | 41,746,517 |
Loans held for sale | [2] | 117,136 |  |
Total loans and leases, net |  | 42,806,691 | 41,746,517 |
Multi-Family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 32,236,385 | $ 31,158,672 |
Non-Covered Loans, Percentage |  | 75.28% | 74.46% |
Commercial Real Estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 6,835,763 | $ 7,081,910 |
Non-Covered Loans, Percentage |  | 15.96% | 16.93% |
One-to-Four Family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 235,989 | $ 380,361 |
Non-Covered Loans, Percentage |  | 0.55% | 0.91% |
Acquisition, Development, and Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 89,790 | $ 200,596 |
Non-Covered Loans, Percentage |  | 0.21% | 0.48% |
Mortgage Receivable |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans | [1] | $ 39,397,927 | $ 38,821,539 |
Non-Covered Loans, Percentage | [1] | 92.00% | 92.78% |
Allowance for loan and lease losses |  | $ (176,538) | $ (122,694) | $ (130,983)
Commercial and Industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans | [3],[4] | $ 3,417,343 | $ 3,014,378 |
Non-Covered Loans, Percentage | [3] | 7.98% | 7.20% |
Commercial and Industrial | Other Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 1,682,519 | $ 1,742,380 |
Non-Covered Loans, Percentage |  | 3.93% | 4.16% |
Lease Financing, Unearned Income |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 1,734,824 | $ 1,271,998 |
Non-Covered Loans, Percentage |  | 4.05% | 3.04% |
Other |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 6,520 | $ 8,102 |
Non-Covered Loans, Percentage |  | 0.02% | 0.02% |
Total Other Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 3,423,863 | $ 3,022,480 |
Total Other Loans | Other Loans |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Non-Covered Loans |  | $ 3,423,863 | $ 3,022,480 |
Non-Covered Loans, Percentage |  | 8.00% | 7.22% |
[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 deferred loan origination fees of $1.7 million.
[3] | 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.
[4] | Includes lease financing receivables, all of which were classified as Pass.

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