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Other Investments - Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Servicing Asset at Fair Value, Amount [Roll Forward]      
Additions $ 328 $ 7,387 $ 10,060
Balance at End of Period 300,000    
Servicing income 15,372 21,120 41,152
Cost of sub-servicer (1,444) (2,828) (6,281)
Net servicing fee income 13,928 18,292 34,871
Market valuation changes of MSRs (2,508) (10,166) (36,372)
Market valuation changes of associated derivatives (4,734) (568) 15,584
MSR reversal of provision for repurchases 390 302 270
MSR Income (Loss), Net 7,076 7,860 14,353
Mortgage servicing rights      
Servicing Asset at Fair Value, Amount [Roll Forward]      
Balance at beginning of period 63,598 118,526 191,976
Additions 328 8,026 25,362
Sales (1,077) (52,788) (62,440)
Changes in fair value due to: Changes in assumptions 4,434 (1,088) (14,512)
Changes in fair value due to: Other changes (7,002) (9,078) (21,860)
Balance at End of Period $ 60,281 $ 63,598 $ 118,526