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Loans and Leases - Composition of Loan and Lease Portfolio (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 42,767,551 | $ 41,844,019 |  |
Non-Covered Loans, Percentage |  | 100.00% | 100.00% |  |
Net deferred loan origination costs |  | $ 61,668 | $ 50,136 |  |
Allowance for loan and lease losses |  | (188,307) | (147,638) | $ (149,433) | $ (159,820)
Total loans and leases held for investment, net |  | 42,640,912 | 41,746,517 |  |
Loans held for sale | [1] | 117,272 |  |  |
Total loans and leases, net |  | 42,758,184 | 41,746,517 |  |
Multi-Family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 32,100,281 | $ 31,158,672 |  |
Non-Covered Loans, Percentage |  | 75.06% | 74.46% |  |
Commercial Real Estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 6,884,667 | $ 7,081,910 |  |
Non-Covered Loans, Percentage |  | 16.10% | 16.93% |  |
One-to-Four Family |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 274,095 | $ 380,361 |  |
Non-Covered Loans, Percentage |  | 0.64% | 0.91% |  |
Acquisition, Development, and Construction |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 86,007 | $ 200,596 |  |
Non-Covered Loans, Percentage |  | 0.20% | 0.48% |  |
Mortgage Receivable |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | $ 39,345,050 | $ 38,821,539 |  |
Non-Covered Loans, Percentage | [2] | 92.00% | 92.78% |  |
Allowance for loan and lease losses |  | $ (170,752) | $ (122,695) | $ (122,967) | $ (130,983)
Commercial and Industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [3],[4] | $ 3,416,040 | $ 3,014,378 |  |
Non-Covered Loans, Percentage | [4] | 7.99% | 7.20% |  |
Commercial and Industrial | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,644,872 | $ 1,742,380 |  |
Non-Covered Loans, Percentage |  | 3.85% | 4.16% |  |
Lease Financing, Unearned Income |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 1,771,168 | $ 1,271,998 |  |
Non-Covered Loans, Percentage |  | 4.14% | 3.04% |  |
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 6,461 | $ 8,102 |  |
Non-Covered Loans, Percentage |  | 0.01% | 0.02% |  |
Total Other Loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 3,422,501 | $ 3,022,480 |  |
Total Other Loans | Other loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Non-Covered Loans | [2] | $ 3,422,501 | $ 3,022,480 |  |
Non-Covered Loans, Percentage | [2] | 8.00% | 7.22% |  |
[1] | Includes deferred loan origination fees of $1.7 million.
[2] | Excludes accrued interest receivable of $217.8 million and $116.9 million at September 30, 2020 and December 31, 2019, respectively, which is included in other assets in the Consolidated Statements of Condition.
[3] | Includes lease financing receivables, all of which were classified as Pass
[4] | 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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