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v3.22.4

Available for Sale Securities (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 12,359,413 | $ 13,064,436 |
Available for sale securities |  | 11,493,860 | 13,157,817 |
Available for sale securities, Gross Unrealized Gain |  | 28,661 | 207,361 |
Available for sale securities, Gross Unrealized Loss |  | (894,214) | (113,980) |
Available for Sale Securities, Realized Gain (Loss) [Abstract] |  |  |  |
Proceeds from sales of available for sale securities |  | 307,481 | 622,881 | $ 384,507
Available for sale securities, Gross realized gains |  | 5,054 | 5,702 | 9,976
Available for sale securities, Gross realized losses |  | (6,025) | (1,998) | (66)
Available for sale securities, Related federal and state income tax expense |  | (227) | 889 | $ 2,524
Asset Pledged as Collateral with Right |  |  |  |
Available for Sale Securities, Realized Gain (Loss) [Abstract] |  |  |  |
Pledged Securities |  | 11,200,000 | 10,200,000 |
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 |  | 121,279 |  |
Available for sale securities, Debt Maturities, One to Five Years, Amortized Cost |  | 2,529,961 |  |
Available for sale securities, Debt Maturities, Six to Ten Years, Amortized Cost |  | 2,396,317 |  |
Available for sale securities, Debt Maturities, Over Ten Years, Amortized Cost |  | 534,075 |  |
Available for sale securities, Maturity, Allocated and Single Maturity Date, Amortized Cost |  | 5,581,632 |  |
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, Less Than One Year, Fair Value |  | 118,907 |  |
Available for sale securities, Debt Maturities, One to Five Years, Fair Value |  | 2,358,353 |  |
Available for sale securities, Debt Maturities, Six to Ten Years, Fair Value |  | 2,126,561 |  |
Available for sale securities, Debt Maturities, Over Ten Years, Fair Value |  | 497,967 |  |
Available for sale securities, Debt Maturities, Single Maturity Date, Fair value |  | $ 5,101,788 |  |
Available for sale securities, Debt Maturities, Weighted Average Maturity | [1] | 6.11 |  |
U.S. Treasury [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 1,000 | 1,001 |
Available for sale securities |  | 898 | 1,000 |
Available for sale securities, Gross Unrealized Gain |  | 0 | 0 |
Available for sale securities, Gross Unrealized Loss |  | (102) | (1) |
Municipal securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 687,875 | 515,551 |
Available for sale securities |  | 624,500 | 508,365 |
Available for sale securities, Gross Unrealized Gain |  | 321 | 1,302 |
Available for sale securities, Gross Unrealized Loss |  | (63,696) | (8,488) |
Commercial agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 4,892,257 | 4,628,172 |
Available for sale securities |  | 4,475,917 | 4,617,025 |
Available for sale securities, Gross Unrealized Gain |  | 3,479 | 36,868 |
Available for sale securities, Gross Unrealized Loss |  | (419,819) | (48,015) |
Other debt securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 500 | 500 |
Available for sale securities |  | 473 | 472 |
Available for sale securities, Gross Unrealized Gain |  | 0 | 0 |
Available for sale securities, Gross Unrealized Loss |  | (27) | (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] | 6,777,781 |  |
Available for Sale Securities, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |
Available for sale securities, Debt Maturities, without Single Maturity Date, Fair value |  | $ 6,392,072 |  |
Available for sale securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 4 months 24 days |  |
Residential agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | $ 6,161,358 | 7,908,587 |
Available for sale securities |  | 5,814,496 | 8,006,616 |
Available for sale securities, Gross Unrealized Gain |  | 13,085 | 155,477 |
Available for sale securities, Gross Unrealized Loss |  | (359,947) | (57,448) |
Residential non-agency mortgage-backed securities [Member] |  |  |  |
Available for Sale Securities [Line Items] |  |  |  |
Available for sale securities, Amortized Cost |  | 616,423 | 10,625 |
Available for sale securities |  | 577,576 | 24,339 |
Available for sale securities, Gross Unrealized Gain |  | 11,776 | 13,714 |
Available for sale securities, Gross Unrealized Loss |  | $ (50,623) | $ 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 4.4 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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