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v3.20.2

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 11,988,585 |  | $ 11,988,585 |  | $ 11,131,494
Available-for-sale Securities, Fair Value |  | 12,475,919 |  | 12,475,919 |  | 11,269,643
Available-for-sale Securities, Gross Unrealized Gain |  | 490,998 |  | 490,998 |  | 158,435
Available-for-sale Securities, Gross Unrealized Loss |  | (3,664) |  | (3,664) |  | (20,286)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Proceeds |  | 179,051 | $ 122,098 | 205,945 | $ 367,357 |
Available-for-sale Securities, Gross realized gains |  | 5,580 | 1,029 | 5,583 | 6,327 |
Available-for-sale Securities, Gross realized losses |  | 0 | 0 | 0 | (5,222) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | 1,421 | $ 262 | 1,422 | $ 281 |
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value |  | 12,300,000 |  | 12,300,000 |  | 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 |  | 34,044 |  | 34,044 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 1,321,471 |  | 1,321,471 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 1,241,310 |  | 1,241,310 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 580,353 |  | 580,353 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 3,177,178 |  | 3,177,178 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 34,144 |  | 34,144 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 1,375,128 |  | 1,375,128 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 1,280,251 |  | 1,280,251 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 603,908 |  | 603,908 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 3,293,431 |  | $ 3,293,431 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 8.03 |  | 8.03 |  |
U.S. Treasury [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 900 |  | $ 900 |  | 1,598
Available-for-sale Securities, Fair Value |  | 912 |  | 912 |  | 1,600
Available-for-sale Securities, Gross Unrealized Gain |  | 12 |  | 12 |  | 2
Available-for-sale Securities, Gross Unrealized Loss |  | 0 |  | 0 |  | 0
Municipal and other tax-exempt securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 29,670 |  | 29,670 |  | 1,789
Available-for-sale Securities, Fair Value |  | 31,240 |  | 31,240 |  | 1,861
Available-for-sale Securities, Gross Unrealized Gain |  | 1,570 |  | 1,570 |  | 72
Available-for-sale Securities, Gross Unrealized Loss |  | 0 |  | 0 |  | 0
Commercial agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 3,146,108 |  | 3,146,108 |  | 3,145,342
Available-for-sale Securities, Fair Value |  | 3,260,807 |  | 3,260,807 |  | 3,178,005
Available-for-sale Securities, Gross Unrealized Gain |  | 116,042 |  | 116,042 |  | 37,808
Available-for-sale Securities, Gross Unrealized Loss |  | (1,343) |  | (1,343) |  | (5,145)
Other debt securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 500 |  | 500 |  | 500
Available-for-sale Securities, Fair Value |  | 472 |  | 472 |  | 472
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | (28) |  | (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] | 8,811,407 |  | 8,811,407 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 9,182,488 |  | $ 9,182,488 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  |  |  | 3.1 years |  |
Residential agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 8,789,466 |  | $ 8,789,466 |  | 7,956,297
Available-for-sale Securities, Fair Value |  | 9,147,238 |  | 9,147,238 |  | 8,046,096
Available-for-sale Securities, Gross Unrealized Gain |  | 360,056 |  | 360,056 |  | 104,912
Available-for-sale Securities, Gross Unrealized Loss |  | (2,284) |  | (2,284) |  | (15,113)
Residential non-agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 21,941 |  | 21,941 |  | 25,968
Available-for-sale Securities, Fair Value |  | 35,250 |  | 35,250 |  | 41,609
Available-for-sale Securities, Gross Unrealized Gain |  | 13,318 |  | 13,318 |  | 15,641
Available-for-sale Securities, Gross Unrealized Loss |  | $ (9) |  | $ (9) |  | $ 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 3.1 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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