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v3.19.3.a.u2

Available for Sale Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 11,131,494 | $ 8,952,391 |
Available for sale securities |  | 11,269,643 | 8,857,120 |
Available for sale securities, Gross Unrealized Gain |  | 158,435 | 42,986 |
Available for sale securities, Gross Unrealized Loss |  | (20,286) | (138,257) |
Available for Sale Securities, Realized Gain (Loss) [Abstract] |  |  |  |
Proceeds from sales of available for sale securities |  | 1,211,718 | 745,643 | $ 1,309,215
Available for sale securities, Gross realized gains |  | 14,996 | 7,117 | 10,223
Available for sale securities, Gross realized losses |  | (9,399) | (9,918) | (5,795)
Available for sale securities, Related federal and state income tax expense |  | 1,425 | (713) | $ 1,722
Available for sale securities, Pledged as Collateral, Fair Value |  | 10,100,000 | 9,100,000 |
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 |  | 5,105 |  |
Available for sale securities, Debt Maturities, One to Five Years, Amortized Cost |  | 1,113,463 |  |
Available for sale securities, Debt Maturities, Six to Ten Years, Amortized Cost |  | 1,455,340 |  |
Available for sale securities, Debt Maturities, Over Ten Years, Amortized Cost |  | 575,321 |  |
Available for sale securities, Maturity, Allocated and Single Maturity Date, Amortized Cost |  | 3,149,229 |  |
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, Less Than One Year, Fair Value |  | 5,114 |  |
Available for sale securities, Debt Maturities, One to Five Years, Fair Value |  | 1,122,392 |  |
Available for sale securities, Debt Maturities, Six to Ten Years, Fair Value |  | 1,474,002 |  |
Available for sale securities, Debt Maturities, Over Ten Years, Fair Value |  | 580,430 |  |
Available for sale securities, Debt Maturities, Single Maturity Date, Fair value |  | $ 3,181,938 |  |
Available for sale securities, Debt Maturities, Weighted Average Maturity | [1] | 8.15 |  |
U.S. Treasury [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 1,598 | 496 |
Available for sale securities |  | 1,600 | 493 |
Available for sale securities, Gross Unrealized Gain |  | 2 | 0 |
Available for sale securities, Gross Unrealized Loss |  | 0 | (3) |
Municipal and other tax-exempt securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 1,789 | 2,782 |
Available for sale securities |  | 1,861 | 2,864 |
Available for sale securities, Gross Unrealized Gain |  | 72 | 82 |
Available for sale securities, Gross Unrealized Loss |  | 0 | 0 |
Commercial agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 3,145,342 | 2,986,297 |
Available for sale securities |  | 3,178,005 | 2,953,889 |
Available for sale securities, Gross Unrealized Gain |  | 37,808 | 7,955 |
Available for sale securities, Gross Unrealized Loss |  | (5,145) | (40,363) |
Other debt securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 500 | 35,545 |
Available for sale securities |  | 472 | 35,430 |
Available for sale securities, Gross Unrealized Gain |  | 0 | 12 |
Available for sale securities, Gross Unrealized Loss |  | (28) | (127) |
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] | 7,982,265 |  |
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, without Single Maturity Date, Fair value |  | $ 8,087,705 |  |
Available for sale securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years |  |
Residential agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 7,956,297 | 5,886,323 |
Available for sale securities |  | 8,046,096 | 5,804,708 |
Available for sale securities, Gross Unrealized Gain |  | 104,912 | 16,149 |
Available for sale securities, Gross Unrealized Loss |  | (15,113) | (97,764) |
Residential non-agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 25,968 | 40,948 |
Available for sale securities |  | 41,609 | 59,736 |
Available for sale securities, Gross Unrealized Gain |  | 15,641 | 18,788 |
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 mortgage-backed securities were 4.0 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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