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Other Investments - Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Servicing Asset at Fair Value, Amount [Roll Forward]    
Balance at beginning of period $ 286,778  
Balance at End of Period 281,762  
Servicing income 3,610 $ 3,796
Cost of sub-servicer (503) (592)
Net servicing fee income 3,107 3,204
Market valuation changes of MSRs (5,101) 2,892
Market valuation changes of associated derivatives 2,251 (5,139)
MSR Income, Net 257 957
Mortgage servicing rights    
Servicing Asset at Fair Value, Amount [Roll Forward]    
Balance at beginning of period 60,281 63,598
Additions 104 0
Changes in fair value due to: Changes in assumptions (3,586) 4,346
Changes in fair value due to: Other changes (1,515) (1,448)
Balance at End of Period $ 55,284 $ 66,496