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Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |
Allowance for loan losses | $ 618,252 |  | $ 618,252 |  |  |  | $ 358,287 |  |
Increase to allowance for loan losses |  |  | 260,000 |  |  |  |  |  |
Provision for (reversal of) credit losses | 10,000 | $ 38,284 | 186,313 | $ 80,108 |  |  |  |  |
Gross charge-offs | 2,800 | 36 | 2,800 | 426 |  |  |  |  |
PCD or PCI loans |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  |  | 0 |  |
Commercial and consumer lending |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |
Allowance for loan losses | 618,252 | 345,576 | 618,252 | 345,576 | $ 632,071 |  | 358,287 | $ 330,625 | $ 311,322
Provision for (reversal of) credit losses | 9,889 | 37,879 | 178,845 | 79,250 |  |  |  |  |
Gross charge-offs | 26,649 | 26,142 | 60,555 | 55,159 |  |  |  |  |
Commercial and industrial (“C&I”) | Commercial lending |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |
Allowance for loan losses | 389,021 | 218,869 | 389,021 | 218,869 | $ 380,723 |  | $ 238,376 | $ 205,503 | $ 189,117
Provision for (reversal of) credit losses | 31,691 | 37,281 | 130,171 | 78,685 |  |  |  |  |
Gross charge-offs | $ 25,111 | $ 25,098 | $ 57,466 | $ 54,087 |  |  |  |  |
ASU 2016-13 |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  | $ 125,200 |  |  |
ASU 2016-13 | PCD or PCI loans |  |  |  |  |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |  |  |  |  |
Allowance for loan losses |  |  |  |  |  | $ 1,200 |  |  |

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