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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2017
Fair Value Disclosures [Abstract] |
Fair Value of Assets and Liabilities Measured at Fair Value on Recurring Basis | The following tables present the fair value of assets and liabilities measured at fair value on a recurring basis as of December 31, 2017 and 2016 (dollars in thousands):
|  | As of December 31, 2017 |
|  | Fair Value Measured and Recorded Using |  |  |  |  |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 3,820 |  |  | $ | — |  |  | $ | — |  |  | $ | 3,820 |
Debt securities issued by U.S. federal agencies |  |  | — |  |  |  | 4,901 |  |  |  | — |  |  |  | 4,901 |
Corporate debt securities |  |  | — |  |  |  | 20,023 |  |  |  | — |  |  |  | 20,023 |
Asset-backed securities |  |  | — |  |  |  | 3,577 |  |  |  | — |  |  |  | 3,577 |
Collateralized mortgage obligations |  |  | — |  |  |  | 2,366 |  |  |  | — |  |  |  | 2,366 |
Total debt securities |  |  | 3,820 |  |  |  | 30,867 |  |  |  | — |  |  |  | 34,687 |
Equity securities |  |  | 29,758 |  |  |  | — |  |  |  | — |  |  |  | 29,758 |
Total available for sale securities |  |  | 33,578 |  |  |  | 30,867 |  |  |  | — |  |  |  | 64,445 |
Trading securities |  |  | 103,837 |  |  |  | — |  |  |  | — |  |  |  | 103,837 |
Warehouse receivables |  |  | — |  |  |  | 928,038 |  |  |  | — |  |  |  | 928,038 |
Total assets at fair value |  | $ | 137,415 |  |  | $ | 958,905 |  |  | $ | — |  |  | $ | 1,096,320 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 4,766 |  |  | $ | — |  |  | $ | 4,766 |
Securities sold, not yet purchased |  |  | 3,431 |  |  |  | — |  |  |  | — |  |  |  | 3,431 |
Foreign currency exchange forward contracts |  |  | — |  |  |  | 55 |  |  |  | — |  |  |  | 55 |
Total liabilities at fair value |  | $ | 3,431 |  |  | $ | 4,821 |  |  | $ | — |  |  | $ | 8,252 |
|  | As of December 31, 2016 |
|  | Fair Value Measured and Recorded Using |  |  |  |  |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available for sale securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasury securities |  | $ | 8,485 |  |  | $ | — |  |  | $ | — |  |  | $ | 8,485 |
Debt securities issued by U.S. federal agencies |  |  | — |  |  |  | 5,046 |  |  |  | — |  |  |  | 5,046 |
Corporate debt securities |  |  | — |  |  |  | 17,094 |  |  |  | — |  |  |  | 17,094 |
Asset-backed securities |  |  | — |  |  |  | 2,695 |  |  |  | — |  |  |  | 2,695 |
Collateralized mortgage obligations |  |  | — |  |  |  | 1,010 |  |  |  | — |  |  |  | 1,010 |
Total debt securities |  |  | 8,485 |  |  |  | 25,845 |  |  |  | — |  |  |  | 34,330 |
Equity securities |  |  | 22,744 |  |  |  | — |  |  |  | — |  |  |  | 22,744 |
Total available for sale securities |  |  | 31,229 |  |  |  | 25,845 |  |  |  | — |  |  |  | 57,074 |
Trading securities |  |  | 52,629 |  |  |  | — |  |  |  | — |  |  |  | 52,629 |
Warehouse receivables |  |  | — |  |  |  | 1,276,047 |  |  |  | — |  |  |  | 1,276,047 |
Foreign currency exchange forward contracts |  |  | — |  |  |  | 1,471 |  |  |  | — |  |  |  | 1,471 |
Total assets at fair value |  | $ | 83,858 |  |  | $ | 1,303,363 |  |  | $ | − |  |  | $ | 1,387,221 |
Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate swaps |  | $ | — |  |  | $ | 13,162 |  |  | $ | — |  |  | $ | 13,162 |
Securities sold, not yet purchased |  |  | 3,591 |  |  |  | — |  |  |  | — |  |  |  | 3,591 |
Total liabilities at fair value |  | $ | 3,591 |  |  | $ | 13,162 |  |  | $ | — |  |  | $ | 16,753 |

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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