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Equity - Reclassifications out of Accumulated Other Comprehensive Income (Loss) (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other than temporary impairment $ 198,000     $ 565,000
Realized gains (losses), net 5,548,000 $ 8,532,000 $ 16,170,000 10,687,000
Total interest expense 23,875,000 23,350,000 70,844,000 63,560,000
Total other-than-temporary impairments 257,000 188,000   4,774,000
Other than temporary impairment, recognized in AOCI 59,000     4,209,000
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized gains on available-for-sale securities        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other than temporary impairment 198,000 188,000 198,000 565,000
Gain on sale of AFS securities (3,468,000) (6,597,000) (10,518,000) (7,315,000)
Realized gains (losses), net (3,270,000) (6,409,000) (10,320,000) (6,750,000)
Reclassification out of Accumulated Other Comprehensive Income | Net unrealized losses on interest rate agreements accounted for as cash flow hedges        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Total interest expense $ 19,000 $ 32,000 $ 77,000 $ 131,000