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Quarterly Financial Data (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Operating results:                      
Interest income $ 68,829 $ 63,484 $ 63,373 $ 63,746 $ 65,251 $ 63,351 $ 57,993 $ 55,475 $ 259,432 $ 242,070 $ 226,156
Interest expense (25,039) (23,875) (23,008) (23,961) (23,903) (23,350) (21,151) (19,059) (95,883) (87,463) (80,971)
Net interest income 43,790 39,609 40,365 39,785 41,348 40,001 36,842 36,416 163,549 154,607 145,185
Non-interest income (loss) 19,593 (3,412) 14,104 (5,031) 10,686 28,519 1,475 (4,671) 25,254 37,790 142,353
Operating expenses (22,638) (24,497) (25,218) (25,063) (26,462) (21,406) (22,282) (19,973) (97,416) (90,123) (86,607)
Net income $ 41,059 $ 19,164 $ 27,064 $ 14,801 $ 27,122 $ 45,097 $ 16,017 $ 12,333 $ 102,088 $ 100,569 $ 173,246
Per share data:                      
Net income - basic (usd per share) $ 0.49 $ 0.22 $ 0.31 $ 0.17 $ 0.32 $ 0.53 $ 0.19 $ 0.14 $ 1.20 $ 1.18 $ 2.05
Net income - diluted (usd per share) 0.46 0.22 0.31 0.16 0.31 0.50 0.18 0.14 1.18 1.15 1.94
Regular dividends declared per common share (usd per share) $ 0.28000 $ 0.28000 $ 0.28000 $ 0.28000 $ 0.28 $ 0.28 $ 0.28 $ 0.28 $ 1.12 $ 1.12 $ 1.12
Commercial Loans Held-for-Investment, at Amortized Cost                      
Quarterly Financial Information [Line Items]                      
Yield maintenance fees received                 $ 4,000 $ 2,000  
Commercial Loans Held-for-Investment, at Amortized Cost | Interest income                      
Quarterly Financial Information [Line Items]                      
Yield maintenance fees received $ 2,000   $ 2,000