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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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Amount of the cost of borrowed funds accounted for as interest expense.

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