Servicing of Residential Loans - Schedule of Geographic Diversification of Third-Party Servicing Portfolio (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Account	Dec. 31, 2013 Account
Concentration Risk [Line Items]
Number of Accounts	2,309,648	2,051,796
Unpaid Principal Balance	$ 256,112,142	$ 217,961,136
Third Party Investors [Member]
Concentration Risk [Line Items]
Number of Accounts	2,192,885	1,939,109
Unpaid Principal Balance	243,532,675	206,518,774
Percentage of Total	100.00%	100.00%
California [Member] | Third Party Investors [Member]
Concentration Risk [Line Items]
Number of Accounts	239,450	215,010
Unpaid Principal Balance	42,499,413	37,461,223
Percentage of Total	17.50%	18.10%
FLORIDA [Member] | Third Party Investors [Member]
Concentration Risk [Line Items]
Number of Accounts	189,111	176,819
Unpaid Principal Balance	22,378,614	21,143,369
Percentage of Total	9.20%	10.20%
TEXAS [Member] | Third Party Investors [Member]
Concentration Risk [Line Items]
Number of Accounts	172,999	147,654
Unpaid Principal Balance	13,724,469	10,700,328
Percentage of Total	5.60%	5.20%
Other Less Than 5% [Member] | Third Party Investors [Member]
Concentration Risk [Line Items]
Number of Accounts	1,591,325	1,399,626
Unpaid Principal Balance	$ 164,930,179	$ 137,213,854
Percentage of Total	67.70%	66.50%