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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 1,106,517 $ 2,100,947
Transfer from level 2 0 0
Purchases 243,921 151,503
Sales (161,518) (669,807)
Paydowns/maturities (56,707) (81,747)
Amortization of premium/discount (12,724) (36,677)
Unrealized gain/(loss) (10,789) 5,638
Realized gain/(loss) on sale (2,342) 12,494
Ending balance $ 1,106,358 $ 1,482,351