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Segment Reporting - Balance Sheet Items (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting      
Cash and cash equivalents $ 19,531 $ 40,096  
Restricted cash 5,956 5,971  
Mortgage loans held-for-sale 434,322 388,422  
Mortgage servicing rights 141,586 131,537 $ 36,425
Trust assets 3,911,676 4,033,290  
Goodwill 104,938 104,938  
Total assets 4,751,358 4,863,734  
Total liabilities 4,515,161 4,632,694  
Operating segments      
Segment Reporting      
Total assets 34,918 53,086  
Mortgage Lending | Operating segments      
Segment Reporting      
Total assets 792,935 762,924  
Real Estate Services | Operating segments      
Segment Reporting      
Total assets 3,156 5,451  
Long-term Portfolio | Operating segments      
Segment Reporting      
Total assets $ 3,920,349 $ 4,042,273