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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
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Interest income (expense) | $ 148,120 | $ 143,771
Interest (Expense) | (11,117) | (24,228)
Residential loans held for sale |  |
Schedule of Trading Securities and Other Trading Assets [Line Items] |  |
Other Gains and (Losses) | (2,380) | 1,421
Interest income (expense) | 2 | 2
Interest (Expense) | 0 | 0
Total Changes in Fair Values Included in Current Period Earnings | $ (2,378) | $ 1,423

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