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v3.19.3

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 10,846,491 |  | $ 10,846,491 |  | $ 8,952,391
Available for sale securities |  | 11,024,551 |  | 11,024,551 |  | 8,857,120
Available-for-sale Securities, Gross Unrealized Gain |  | 191,716 |  | 191,716 |  | 42,986
Available-for-sale Securities, Gross Unrealized Loss |  | (13,656) |  | (13,656) |  | (138,257)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Proceeds from sales of available for sale securities |  | 261,028 | $ 45,293 | 628,385 | $ 232,826 |
Available-for-sale Securities, Gross realized gains |  | 989 | 250 | 7,316 | 700 |
Available-for-sale Securities, Gross realized losses |  | (984) | 0 | (6,206) | (1,502) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | 1 | $ 64 | 282 | $ (204) |
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value |  | 10,800,000 |  | 10,800,000 |  | 9,100,000
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 |  | 35,845 |  | 35,845 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 1,069,415 |  | 1,069,415 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 1,476,121 |  | 1,476,121 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 599,373 |  | 599,373 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 3,180,754 |  | 3,180,754 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 35,806 |  | 35,806 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 1,081,571 |  | 1,081,571 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 1,512,308 |  | 1,512,308 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 609,602 |  | 609,602 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 3,239,287 |  | $ 3,239,287 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 8.29 |  | 8.29 |  |
U.S. Treasury [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 2,294 |  | $ 2,294 |  | 496
Available for sale securities |  | 2,296 |  | 2,296 |  | 493
Available-for-sale Securities, Gross Unrealized Gain |  | 2 |  | 2 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | 0 |  | 0 |  | (3)
Municipal and other tax-exempt securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 1,772 |  | 1,772 |  | 2,782
Available for sale securities |  | 1,848 |  | 1,848 |  | 2,864
Available-for-sale Securities, Gross Unrealized Gain |  | 76 |  | 76 |  | 82
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 |  | 3,176,188 |  | 3,176,188 |  | 2,986,297
Available for sale securities |  | 3,234,671 |  | 3,234,671 |  | 2,953,889
Available-for-sale Securities, Gross Unrealized Gain |  | 61,003 |  | 61,003 |  | 7,955
Available-for-sale Securities, Gross Unrealized Loss |  | (2,520) |  | (2,520) |  | (40,363)
Other debt securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 500 |  | 500 |  | 35,545
Available for sale securities |  | 472 |  | 472 |  | 35,430
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 12
Available-for-sale Securities, Gross Unrealized Loss |  | (28) |  | (28) |  | (127)
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] | 7,665,737 |  | 7,665,737 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | 7,785,264 |  | $ 7,785,264 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  |  |  | 4 years |  |
Residential agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 7,636,923 |  | $ 7,636,923 |  | 5,886,323
Available for sale securities |  | 7,740,461 |  | 7,740,461 |  | 5,804,708
Available-for-sale Securities, Gross Unrealized Gain |  | 114,646 |  | 114,646 |  | 16,149
Available-for-sale Securities, Gross Unrealized Loss |  | (11,108) |  | (11,108) |  | (97,764)
Residential non-agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 28,814 |  | 28,814 |  | 40,948
Available for sale securities |  | 44,803 |  | 44,803 |  | 59,736
Available-for-sale Securities, Gross Unrealized Gain |  | 15,989 |  | 15,989 |  | 18,788
Available-for-sale Securities, Gross Unrealized Loss |  | $ 0 |  | $ 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 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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