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Mortgage Servicing (Details) - MSRs - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Mortgage Servicing      
Unpaid principal balance of loans serviced $ 16,690,006   $ 16,206,315
Weighted average servicing fee (as a percent) 0.475%   0.477%
Interest earned on escrows $ 2,200 $ 700  
Fee-based servicing portfolio      
Mortgage Servicing      
UPB Percentage of Total 100.00%   100.00%
Escrow Deposit $ 443,200   $ 477,900
Fee-based servicing portfolio | Texas      
Mortgage Servicing      
UPB Percentage of Total 22.00%   22.00%
Fee-based servicing portfolio | North Carolina      
Mortgage Servicing      
UPB Percentage of Total 10.00%   10.00%
Fee-based servicing portfolio | California      
Mortgage Servicing      
UPB Percentage of Total 8.00%   8.00%
Fee-based servicing portfolio | New York      
Mortgage Servicing      
UPB Percentage of Total 8.00%   8.00%
Fee-based servicing portfolio | Georgia      
Mortgage Servicing      
UPB Percentage of Total 6.00%   6.00%
Fee-based servicing portfolio | Florida      
Mortgage Servicing      
UPB Percentage of Total 6.00%   6.00%
Fee-based servicing portfolio | Other      
Mortgage Servicing      
UPB Percentage of Total 40.00%   40.00%
Fannie Mae      
Mortgage Servicing      
Unpaid principal balance of loans serviced $ 12,700,635   $ 12,502,699
Fannie Mae | Fee-based servicing portfolio      
Mortgage Servicing      
UPB Percentage of Total 76.00%   77.00%
Freddie Mac      
Mortgage Servicing      
Unpaid principal balance of loans serviced $ 3,397,535   $ 3,166,134
Freddie Mac | Fee-based servicing portfolio      
Mortgage Servicing      
UPB Percentage of Total 20.00%   20.00%
FHA      
Mortgage Servicing      
Unpaid principal balance of loans serviced $ 591,836   $ 537,482
FHA | Fee-based servicing portfolio      
Mortgage Servicing      
UPB Percentage of Total 4.00%   3.00%