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Other Assets and Liabilities - Components of MSR income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]        
Servicing income $ 3,802 $ 6,511 $ 7,597 $ 13,418
Cost of sub-servicer (338) (659) (930) (2,039)
Net servicing fee income 3,464 5,852 6,667 11,379
Market valuation changes of MSRs (745) (6,421) 2,147 (9,491)
Market valuation changes of associated derivatives (1,122) 3,040 (6,261) 2,291
MSR reversal of provision for repurchases 277 307 277 312
MSR Income, Net $ 1,874 $ 2,778 $ 2,830 $ 4,491