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Available for Sale Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 13,064,436 | $ 12,609,850 |
Available for sale securities |  | 13,157,817 | 13,050,665 |
Available for sale securities, Gross Unrealized Gain |  | 207,361 | 449,654 |
Available for sale securities, Gross Unrealized Loss |  | (113,980) | (8,839) |
Available for Sale Securities, Realized Gain (Loss) [Abstract] |  |  |  |
Proceeds from sales of available for sale securities |  | 622,881 | 384,507 | $ 1,211,718
Available for sale securities, Gross realized gains |  | 5,702 | 9,976 | 14,996
Available for sale securities, Gross realized losses |  | (1,998) | (66) | (9,399)
Available for sale securities, Related federal and state income tax expense |  | 889 | 2,524 | $ 1,425
Available for sale securities, Pledged as Collateral, Fair Value |  | 10,200,000 | 11,600,000 |
Fixed maturity securities [Member] |  |  |  |
Available for Sale Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, Less than One Year, Amortized Cost |  | 74,454 |  |
Available for sale securities, Debt Maturities, One to Five Years, Amortized Cost |  | 1,881,944 |  |
Available for sale securities, Debt Maturities, Six to Ten Years, Amortized Cost |  | 2,695,022 |  |
Available for sale securities, Debt Maturities, Over Ten Years, Amortized Cost |  | 493,804 |  |
Available for sale securities, Maturity, Allocated and Single Maturity Date, Amortized Cost |  | 5,145,224 |  |
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, Less Than One Year, Fair Value |  | 74,874 |  |
Available for sale securities, Debt Maturities, One to Five Years, Fair Value |  | 1,898,237 |  |
Available for sale securities, Debt Maturities, Six to Ten Years, Fair Value |  | 2,657,759 |  |
Available for sale securities, Debt Maturities, Over Ten Years, Fair Value |  | 495,992 |  |
Available for sale securities, Debt Maturities, Single Maturity Date, Fair value |  | $ 5,126,862 |  |
Available for sale securities, Debt Maturities, Weighted Average Maturity | [1] | 6.76 |  |
U.S. Treasury [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 1,001 | 500 |
Available for sale securities |  | 1,000 | 508 |
Available for sale securities, Gross Unrealized Gain |  | 0 | 8 |
Available for sale securities, Gross Unrealized Loss |  | (1) | 0 |
Municipal securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 515,551 | 165,318 |
Available for sale securities |  | 508,365 | 167,979 |
Available for sale securities, Gross Unrealized Gain |  | 1,302 | 2,666 |
Available for sale securities, Gross Unrealized Loss |  | (8,488) | (5) |
Commercial agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 4,628,172 | 3,406,956 |
Available for sale securities |  | 4,617,025 | 3,508,465 |
Available for sale securities, Gross Unrealized Gain |  | 36,868 | 103,590 |
Available for sale securities, Gross Unrealized Loss |  | (48,015) | (2,081) |
Other debt securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 500 | 500 |
Available for sale securities |  | 472 | 472 |
Available for sale securities, Gross Unrealized Gain |  | 0 | 0 |
Available for sale securities, Gross Unrealized Loss |  | (28) | (28) |
Residential Mortgage Backed Securities [Member] |  |  |  |
Available for Sale Securities, Debt Maturities, Amortized Cost, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Maturity, without Single Maturity Date, Amortized Cost | [2] | 7,919,212 |  |
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, without Single Maturity Date, Fair value |  | $ 8,030,955 |  |
Available for sale securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 3 years 8 months 12 days |  |
Residential agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 7,908,587 | 9,019,013 |
Available for sale securities |  | 8,006,616 | 9,340,471 |
Available for sale securities, Gross Unrealized Gain |  | 155,477 | 328,183 |
Available for sale securities, Gross Unrealized Loss |  | (57,448) | (6,725) |
Residential non-agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 10,625 | 17,563 |
Available for sale securities |  | 24,339 | 32,770 |
Available for sale securities, Gross Unrealized Gain |  | 13,714 | 15,207 |
Available for sale securities, Gross Unrealized Loss |  | $ 0 | $ 0 |
[1] | Expected maturities may differ from contractual maturities, because borrowers may have the right to call or prepay obligations with or without penalty.
[2] | The average expected lives of residential mortgage-backed securities were 3.7 years based upon current prepayment assumptions.

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- Definition The calculated weighted-average expected life of mortgage-backed securities based on prepayment assumptions as of the balance sheet date. + References No definition available. + Details
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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27161-111563 + Details
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