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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2018
Available-for-sale Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning of period level 3 fair value $ 153,424 $ 153,141
Realized (losses) gains 0 0
Unrealized (losses) gains 0 0
Total gains (losses) included in net income 0 0
Other comprehensive (loss) income (424) (141)
Purchases 0 0
Sales 0 0
Settlements (113,000) (113,000)
Gross transfers into level 3 0 0
Gross transfers out of level 3 0 0
End of period level 3 fair value 40,000 40,000
Servicing Contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning of period level 3 fair value 1,450,261 1,086,717
Realized (losses) gains (42,089) (107,359)
Unrealized (losses) gains 62,680 209,610
Total gains (losses) included in net income 20,591 102,251
Other comprehensive (loss) income 0 0
Purchases 201,197 480,462
Sales 4 (395)
Settlements (8,029) (5,011)
Gross transfers into level 3 0 0
Gross transfers out of level 3 0 0
End of period level 3 fair value 1,664,024 1,664,024
Loans Receivable [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning of period level 3 fair value 28,351 29,940
Realized (losses) gains 167 (41)
Unrealized (losses) gains 129 901
Total gains (losses) included in net income 296 860
Other comprehensive (loss) income 0 0
Purchases 0 0
Sales 0 0
Settlements (1,566) (3,719)
Gross transfers into level 3 0 0
Gross transfers out of level 3 0 0
End of period level 3 fair value 27,081 27,081
Other Comprehensive Income (Loss) [Member] | Available-for-sale Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period 0 0
Other Comprehensive Income (Loss) [Member] | Servicing Contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period 0 0
Other Comprehensive Income (Loss) [Member] | Loans Receivable [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period 0 0
Other Income (Loss) [Member] | Available-for-sale Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period 0 0
Other Income (Loss) [Member] | Servicing Contracts [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period 62,275 201,666
Other Income (Loss) [Member] | Loans Receivable [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Change in unrealized gains or losses for the period included in earnings for assets held at the end of the reporting period $ 127 $ 806