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Loans Receivable and Allowance for Credit Losses (Allowance for Credit Losses Narrative) (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Financing Receivable Allowance for Credit Losses |  |  |  |  |
Allowance for loan losses | $ 557,003,000 | $ 317,894,000 |  | $ 358,287,000 |
Allowance for loan losses, percentage of loans held-for-investment | 1.55% | 0.97% |  | 1.03% |
Increase in provision for credit losses |  | $ 73,900,000 |  |  |
Gross charge-offs | $ 0 | 73,000 |  |  |
PCD Loans |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |
Allowance for loan losses |  | $ 14,000 |  | $ 0 | $ 22,000
Commercial and consumer lending |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |
Allowance for loan losses | 557,003,000 |  | $ 483,445,000 | $ 358,287,000 |
Gross charge-offs | 12,957,000 |  |  |  |
Net charge-offs | $ (898,000) |  |  |  |
Net charge-offs, percentage of loans held-for-investment | 0.01% |  |  |  |
Commercial and industrial (“C&I”) |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |
Allowance for loan losses | $ 416,000 |  |  |  |
Gross charge-offs | $ 12,000,000.0 |  |  |  |
ASU 2016-13 |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |
Allowance for loan losses |  |  | 125,200,000 |  |
ASU 2016-13 | PCD Loans |  |  |  |  |
Financing Receivable Allowance for Credit Losses |  |  |  |  |
Allowance for loan losses |  |  | $ 1,200,000 |  |

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