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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 2,407,217 $ 2,683,745
Transfer from level 2 0 86,576
Purchases 977,456 720,010
Sales (539,295) (839,868)
Paydowns/maturities (684,143) (160,612)
Amortization of premium/discount (76,475) (70,763)
Unrealized gain/(loss) 8,463 (36,610)
Realized gain/(loss) on sale 7,724 24,739
Ending balance $ 2,100,947 $ 2,407,217