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v3.20.1

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 USD ($) | Mar. 31, 2019 USD ($) | Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 12,258,288 |  | $ 11,131,494
Available-for-sale Securities, Fair Value |  | 12,694,277 |  | 11,269,643
Available-for-sale Securities, Gross Unrealized Gain |  | 449,088 |  | 158,435
Available-for-sale Securities, Gross Unrealized Loss |  | (13,099) |  | (20,286)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |
Available-for-sale Securities, Proceeds |  | 26,894 | $ 245,259 |
Available-for-sale Securities, Gross realized gains |  | 3 | 5,298 |
Available-for-sale Securities, Gross realized losses |  | 0 | (5,222) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | 1 | $ 19 |
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value |  | 13,100,000 |  | 10,100,000
Fixed Maturity Securities [Member] |  |  |  |
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Amortized Cost Basis |  | 34,239 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 1,223,377 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 1,400,140 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 644,759 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 3,302,515 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 34,320 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 1,264,488 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 1,439,807 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 661,707 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 3,400,322 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 8.34 |  |
U.S. Treasury [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 901 |  | 1,598
Available-for-sale Securities, Fair Value |  | 917 |  | 1,600
Available-for-sale Securities, Gross Unrealized Gain |  | 16 |  | 2
Available-for-sale Securities, Gross Unrealized Loss |  | 0 |  | 0
Municipal and other tax-exempt securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 23,166 |  | 1,789
Available-for-sale Securities, Fair Value |  | 24,034 |  | 1,861
Available-for-sale Securities, Gross Unrealized Gain |  | 872 |  | 72
Available-for-sale Securities, Gross Unrealized Loss |  | (4) |  | 0
Commercial agency mortgage-backed securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 3,277,948 |  | 3,145,342
Available-for-sale Securities, Fair Value |  | 3,374,899 |  | 3,178,005
Available-for-sale Securities, Gross Unrealized Gain |  | 103,953 |  | 37,808
Available-for-sale Securities, Gross Unrealized Loss |  | (7,002) |  | (5,145)
Other debt securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 500 |  | 500
Available-for-sale Securities, Fair Value |  | 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] |  |  |  |
Debt Securities, Available-for-sale, Maturity, Amortized Cost, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost | [2] | 8,955,773 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 9,293,955 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 3 years 3 months 18 days |  |
Residential agency mortgage-backed securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 8,931,771 |  | 7,956,297
Available-for-sale Securities, Fair Value |  | 9,259,089 |  | 8,046,096
Available-for-sale Securities, Gross Unrealized Gain |  | 333,298 |  | 104,912
Available-for-sale Securities, Gross Unrealized Loss |  | (5,980) |  | (15,113)
Residential non-agency mortgage-backed securities [Member] |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 24,002 |  | 25,968
Available-for-sale Securities, Fair Value |  | 34,866 |  | 41,609
Available-for-sale Securities, Gross Unrealized Gain |  | 10,949 |  | 15,641
Available-for-sale Securities, Gross Unrealized Loss |  | $ (85) |  | $ 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 3.3 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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