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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 |  |  |  |  |  |  |  |

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