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Derivative Instruments - Fair value of Derivative Instruments (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]          
Fair value of derivative assets $ 5,003,000   $ 5,003,000   $ 46,207,000
Fair value of derivative liabilities 68,695,000   68,695,000   15,901,000
AOCI relating to interest rate swaps     9,500,000    
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months (3,700,000)   (3,700,000)    
Unrealized loss (gain) on interest rate swaps, net 57,710,000 $ (13,856,000) 91,429,000 $ (39,250,000)  
Interest rate swaps          
Derivative [Line Items]          
Fair value of derivative assets 3,402,000   3,402,000   40,192,000
Fair value of derivative liabilities 68,695,000   68,695,000   15,901,000
Interest rate swap agreements          
Derivative [Line Items]          
Fair value of derivative assets $ 3,400,000   $ 3,400,000    
Derivative contract, weighted average maturity (in months)     43 months    
Number of matured or terminated interest rate swap agreements 11        
Notional amount of swap agreements matured or terminated during period $ 400,000,000        
TBA Agency MBS          
Derivative [Line Items]          
Fair value of derivative assets $ 1,601,000   $ 1,601,000   $ 6,015,000
Minimum | Interest rate swap agreements          
Derivative [Line Items]          
Fixed interest rate 1.287%   1.287%    
Minimum | TBA Agency MBS          
Derivative [Line Items]          
Fixed interest rate 3.50%   3.50%    
Maximum | Interest rate swap agreements          
Derivative [Line Items]          
Fixed interest rate 3.2205%   3.2205%    
Maximum | TBA Agency MBS          
Derivative [Line Items]          
Fixed interest rate 4.00%   4.00%