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Fair Value, Level 3 Assets (Servicing Related Assets) Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Servicing Asset [Abstract]      
Beginning balance [1] $ 122,806    
Changes in Fair Value due to [Abstract]      
Unrealized loss included in Net Income (3,573) $ 9,159 $ (3,036)
Ending balance [1] 294,907 122,806  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Servicing Asset [Abstract]      
Beginning balance [2] 122,806 61,263  
Purchases, sales and principal paydowns [Abstract]      
Purchases [2]   83,586  
Sales [2]   (35,905)  
Other changes [2],[3]   4,703  
Purchases, sales and principal paydowns [2]   52,384  
Changes in Fair Value due to [Abstract]      
Changes in valuation inputs or assumptions used in valuation model [2]   16,034  
Other changes in fair value [2],[4]   (6,875)  
Unrealized loss included in Net Income [2]   9,159  
Ending balance 294,907 122,806 [2] 61,263 [2]
Excess MSR Pool 2 [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Servicing Asset [Abstract]      
Beginning balance [2] 0 29,392  
Purchases, sales and principal paydowns [Abstract]      
Purchases [2]   0  
Sales [2]   (35,905)  
Other changes [2],[3]   6,513  
Purchases, sales and principal paydowns [2]   (29,392)  
Changes in Fair Value due to [Abstract]      
Changes in valuation inputs or assumptions used in valuation model [2]   0  
Other changes in fair value [2],[4]   0  
Unrealized loss included in Net Income [2]   0  
Ending balance [2]   0 29,392
MSRs [Member] | Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Servicing Asset [Abstract]      
Beginning balance [2] 122,806 31,871  
Purchases, sales and principal paydowns [Abstract]      
Purchases [2] 178,192 83,586  
Sales [2]   0  
Other changes [2],[3] (2,518) (1,810)  
Purchases, sales and principal paydowns [2] 175,674 81,776  
Changes in Fair Value due to [Abstract]      
Changes in valuation inputs or assumptions used in valuation model [2] 14,648 16,034  
Other changes in fair value [2],[4] (18,221) (6,875)  
Unrealized loss included in Net Income [2] (3,573) 9,159  
Ending balance [2] $ 294,907 $ 122,806 $ 31,871
[1] Carrying value represents the fair value of the pools (see Note 9).
[2] Includes the recapture agreement for each respective pool.
[3] Represents purchase price adjustments, principally contractual prepayment protection, and changes due to the Company's repurchase of the underlying collateral.
[4] Represents changes due to realization of expected cash flows and estimated MSR runoff.