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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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