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Borrowed Funds - Analysis of Contractual Maturities of Outstanding Federal Home Loan Bank Advances (Details) - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Year of Maturity
Total FHLB advances		$ 14,302,661	$ 14,627,661	$ 13,102,661
Contractual Maturity
Year of Maturity
2021			3,272,661
2022			550,000
2023			2,525,000
2024			800,000
2028			4,350,000
2029			3,130,000
Total FHLB advances			$ 14,627,661
Weighted Average Interest Rate
2021	[1]		0.87%
2022	[1]		1.31%
2023	[1]		0.85%
2024	[1]		0.53%
2028	[1]		2.40%
2029	[1]		1.55%
Total FHLB advances	[1]		1.47%
Earlier of Contractual Maturity or Next Call Date
Year of Maturity
2021			$ 8,952,661
2022			2,150,000
2023			2,725,000
2024			800,000
Total FHLB advances			$ 14,627,661
Weighted Average Interest Rate
2021	[1]		1.73%
2022	[1]		1.43%
2023	[1]		0.91%
2024	[1]		0.53%
Total FHLB advances	[1]		1.47%
[1] Does not included the effect interest rate swap agreements.

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Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages.

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The calculated weighted average interest rate for Federal Home Loan Bank advances outstanding as of the Balance Sheet date.

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Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due after fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in second fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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Weighted average interest rate of advance from Federal Home Loan Bank (FHLBank) due in fourth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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