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Investment Securities - Expected Maturities of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Available-for-sale, Amortized Cost
Within one year	$ 126,291
One to five years	2,208,550
Five to ten years	2,015,116
Beyond ten years	2,310,263
Total	6,660,220	$ 5,784,754
Available-for-sale, Fair Value
Within one year	127,635
One to five years	2,271,071
Five to ten years	2,005,310
Beyond ten years	2,320,514
Total	$ 6,724,530	$ 5,970,115
Available-for-sale, Weighted Average Yield
Within one year	2.86%
One to five years	2.43%
Five to ten years	1.77%
Beyond ten years	2.45%
Total	2.25%

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