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Derivative Instruments (Schedule of Call Options and Interest Rate Swaps by Counterparty) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
Derivative [Line Items] |  |
Derivative instruments | $ 431,727 | $ 1,277,480
Derivative collateral | 400,000 | 1,300,000
Credit risk, maximum exposure | 3,300 | 8,500
Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 39,335,903 | 40,091,353
Derivative instruments | 430,558 | 1,276,574
Bank of America | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 3,574,125 | 3,556,256
Derivative instruments | 26,080 | 99,229
Barclays | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 3,686,896 | 4,213,658
Derivative instruments | 39,657 | 157,865
Canadian Imperial Bank of Commerce | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 2,707,734 | 3,956,329
Derivative instruments | 34,218 | 141,540
Citibank, N.A. | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 3,748,162 | 3,190,833
Derivative instruments | 29,873 | 115,860
Credit Suisse | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 2,086,470 | 3,716,868
Derivative instruments | 20,691 | 113,295
J.P. Morgan | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 6,501,103 | 4,482,832
Derivative instruments | 69,006 | 105,899
Morgan Stanley | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 2,957,389 | 2,223,743
Derivative instruments | 38,470 | 47,950
Royal Bank of Canada | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 4,378,132 | 3,567,972
Derivative instruments | 58,026 | 100,472
Societe Generale | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 2,099,081 | 2,548,072
Derivative instruments | 17,157 | 86,494
Truist | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 1,960,787 | 2,547,808
Derivative instruments | 32,885 | 94,924
Wells Fargo | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 5,436,824 | 5,820,381
Derivative instruments | 61,840 | 206,403
Exchange Traded | Call Options And Interest Rate Swaps |  |
Derivative [Line Items] |  |
Notional amount | 199,200 | 266,601
Derivative instruments | $ 2,655 | $ 6,643

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