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Fair Value - Changes in Fair Value for Items Measured at Fair Value Pursuant to Election of the Fair Value (Detail) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Interest income (expense) | $ 161,079 | $ 145,573 | $ 145,671 | $ 143,771 | $ 148,899 | $ 153,096 | $ 155,230 | $ 147,048 | $ 596,094 | $ 604,273 | $ 537,602
Interest (Expense) | $ (12,170) | $ (14,513) | $ (16,303) | $ (24,228) | $ (27,654) | $ (32,757) | $ (33,833) | $ (31,870) | (67,214) | (126,114) | $ (94,443)
Residential loans held for sale |  |  |  |  |  |  |  |  |  |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Other Gains and (Losses) |  |  |  |  |  |  |  |  | 1,962 | 1,036 |
Interest income (expense) |  |  |  |  |  |  |  |  | 18 | 18 |
Interest (Expense) |  |  |  |  |  |  |  |  | (24) | 0 |
Total Changes in Fair Values Included in Current Period Earnings |  |  |  |  |  |  |  |  | $ 1,956 | $ 1,054 |

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