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Loans Held for Sale, at Fair Value (Tables) | 3 Months Ended
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Mar. 31, 2018
Loans Receivable Held For Sale Net [Abstract] |
Summary of Loans Held for Sale at Cost Basis and Fair Value | Loans held for sale had a cost basis and fair value as follows (in thousands):
|  | Cost Basis |  |  | Fair Value |
March 31, 2018 |  | $ | 950,514 |  |  | $ | 965,639 |
December 31, 2017 |  | $ | 360,440 |  |  | $ | 362,635 |

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