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FAIR VALUE OF FINANCIAL INSTRUMENTS - Schedule of Changes in Level 3 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Beginning balance $ 2,100,947 $ 2,407,217
Transfer from level 2 0 0
Purchases 45,726 227,758
Sales (361,323) (15,477)
Paydowns/maturities (74,285) (36,136)
Amortization of premium/discount (19,357) (18,958)
Unrealized gain/(loss) 4,911 34,459
Realized gain/(loss) on sale 5,361 11
Ending balance $ 1,701,980 $ 2,598,874