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Fair Value, Company's Level 3 Assets (Servicing Related Assets) Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Changes in Fair Value due to:      
Unrealized gain (loss) included in Net Income $ 12,312 $ (4,539)  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance [1] 61,263 97,803 $ 97,803
Purchases, sales and principal paydowns [Abstract]      
Purchases [1] 33,340   16,179
Sales [1] (36,748)   (41,095)
Proceeds from principal paydowns [1]     (7,804)
Other changes [1],[2] 6,531   (784)
Purchases, sales and principal paydowns [1] 3,123   (33,504)
Changes in Fair Value due to:      
Changes in valuation inputs or assumptions used in valuation model [1] 13,265   476
Other changes in fair value [1],[3] (953)   (3,512)
Unrealized gain (loss) included in Net Income [1] 12,312   (3,036)
Ending balance [1] 76,698   61,263
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Pool 1 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance [1] 0 43,482 43,482
Purchases, sales and principal paydowns [Abstract]      
Purchases [1]     0
Sales [1]     (39,916)
Proceeds from principal paydowns [1]     (3,566)
Other changes [1],[2]     0
Purchases, sales and principal paydowns [1]     (43,482)
Changes in Fair Value due to:      
Changes in valuation inputs or assumptions used in valuation model [1]     0
Other changes in fair value [1],[3]     0
Unrealized gain (loss) included in Net Income [1]     0
Ending balance [1]     0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Pool 2 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance [1] 29,392 33,054 33,054
Purchases, sales and principal paydowns [Abstract]      
Purchases [1] 0   0
Sales [1] (35,905)   0
Proceeds from principal paydowns [1]     (3,911)
Other changes [1],[2] 6,513   0
Purchases, sales and principal paydowns [1] (29,392)   (3,911)
Changes in Fair Value due to:      
Changes in valuation inputs or assumptions used in valuation model [1] 0   249
Other changes in fair value [1],[3] 0   0
Unrealized gain (loss) included in Net Income [1] 0   249
Ending balance [1] 0   29,392
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Excess MSR Pool 2014 [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance [1] 0 1,506 1,506
Purchases, sales and principal paydowns [Abstract]      
Purchases [1]     0
Sales [1]     (1,179)
Proceeds from principal paydowns [1]     (327)
Other changes [1],[2]     0
Purchases, sales and principal paydowns [1]     (1,506)
Changes in Fair Value due to:      
Changes in valuation inputs or assumptions used in valuation model [1]     0
Other changes in fair value [1],[3]     0
Unrealized gain (loss) included in Net Income [1]     0
Ending balance [1]     0
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | MSRs [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Beginning balance [1] 31,871 $ 19,761 19,761
Purchases, sales and principal paydowns [Abstract]      
Purchases [1] 33,340   16,179
Sales [1] 0   0
Proceeds from principal paydowns [1]     0
Other changes [1],[2] (825)   (784)
Purchases, sales and principal paydowns [1] 32,515   15,395
Changes in Fair Value due to:      
Changes in valuation inputs or assumptions used in valuation model [1] 13,265   227
Other changes in fair value [1],[3] (953)   (3,512)
Unrealized gain (loss) included in Net Income [1] 12,312   (3,285)
Ending balance [1] $ 76,698   $ 31,871
[1] Includes the recapture agreement for each respective pool.
[2] Represents purchase price adjustments, principally contractual prepayment protection, and changes due to the Company's repurchase of the underlying collateral.
[3] Represents changes due to realization of expected cash flows.