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MBS, CRT Securities and MSR Related Assets (Credit Loss Component of OTTI) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]    
Credit loss component of OTTI at beginning of period $ 38,337 $ 37,305
Additions for credit related OTTI not previously recognized 0 63
Subsequent additional credit related OTTI recorded 0 351
Credit loss component of OTTI at end of period $ 38,337 $ 37,719