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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,385,957 $ 1,106,517
Transfer from level 2 0 0
Purchases 847,318 243,921
Sales (379,961) (161,518)
Paydowns/maturities (110,400) (56,707)
Amortization of premium/discount (6,267) (12,724)
Unrealized gain/(loss) 18,804 (10,789)
Realized gain/(loss) on sale 7,242 (2,342)
Ending balance $ 1,762,693 $ 1,106,358