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Basis of Presentation and Accounting Policies - Immaterial Correction of Consolidated Statement of Cash Flows (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Proceeds from sales of investment securities available for sale	$ 223,977	$ 2,529,722
Purchases of investment securities available for sale	(5,447,210)	(4,778,166)
Net cash used in investing activities	$ (3,101,133)	(3,223,538)
As Reported
Proceeds from sales of investment securities available for sale		3,932,368
Purchases of investment securities available for sale		(6,180,812)
Net cash used in investing activities		(3,223,538)
Adjustment
Proceeds from sales of investment securities available for sale		(1,402,646)
Purchases of investment securities available for sale		1,402,646
Net cash used in investing activities		$ 0

X

- Definition

Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 24
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Amount of cash outflow to acquire investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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