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Investment Securities - Expected Maturities of Investment Securities Portfolio (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Available-for-sale, Amortized Cost
Within one year	$ 101,565
One to five years	2,377,074
Five to ten years	2,496,036
Beyond ten years	2,409,358
Total	7,384,033	$ 5,784,754
Available-for-sale, Fair Value
Within one year	102,886
One to five years	2,389,054
Five to ten years	2,449,808
Beyond ten years	2,440,318
Total	$ 7,382,066	$ 5,970,115
Available-for-sale, Weighted Average Yield
Within one year	2.87%
One to five years	2.05%
Five to ten years	1.75%
Beyond ten years	2.40%
Total	2.07%

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