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v3.25.3

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2025 USD ($) | Sep. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 13,684,712 |  | $ 13,684,712 |  | $ 13,388,935
Available-for-sale Securities, Fair Value |  | 13,481,030 |  | 13,481,030 |  | 12,851,600
Available-for-sale Securities, Gross Unrealized Gain |  | 116,845 |  | 116,845 |  | 29,911
Available-for-sale Securities, Gross Unrealized Loss |  | (320,527) |  | (320,527) |  | (567,246)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Proceeds |  | 171,345 | $ 101,522 | 171,345 | $ 839,352 |
Available-for-sale Securities, Gross realized gains |  | 630 | 1,802 | 630 | 2,257 |
Available-for-sale Securities, Gross realized losses |  | (417) | (2,493) | (417) | (48,085) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | 50 | $ (163) | 50 | $ (10,779) |
Asset Pledged as Collateral with Right |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Pledged Securities |  | 10,300,000 |  | 10,300,000 |  | 9,900,000
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 |  | 450,706 |  | 450,706 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 2,213,053 |  | 2,213,053 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 392,697 |  | 392,697 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 421,842 |  | 421,842 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 3,478,298 |  | 3,478,298 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 443,022 |  | 443,022 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 2,100,852 |  | 2,100,852 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 376,871 |  | 376,871 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 413,393 |  | 413,393 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 3,334,138 |  | $ 3,334,138 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 4.69 |  | 4.69 |  |
U.S. Treasury [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 1,000 |  | $ 1,000 |  | 1,000
Available-for-sale Securities, Fair Value |  | 972 |  | 972 |  | 945
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | (28) |  | (28) |  | (55)
Municipal securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 196,937 |  | 196,937 |  | 240,528
Available-for-sale Securities, Fair Value |  | 188,921 |  | 188,921 |  | 225,568
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 2
Available-for-sale Securities, Gross Unrealized Loss |  | (8,016) |  | (8,016) |  | (14,962)
Commercial agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 3,279,861 |  | 3,279,861 |  | 3,436,465
Available-for-sale Securities, Fair Value |  | 3,143,772 |  | 3,143,772 |  | 3,204,016
Available-for-sale Securities, Gross Unrealized Gain |  | 6,662 |  | 6,662 |  | 726
Available-for-sale Securities, Gross Unrealized Loss |  | (142,751) |  | (142,751) |  | (233,175)
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 |  | 473 |  | 473 |  | 473
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | (27) |  | (27) |  | (27)
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] | 10,206,414 |  | 10,206,414 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 10,146,892 |  | 10,146,892 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 1 month 6 days |  |  |  |
Residential agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 9,448,172 |  | 9,448,172 |  | 8,895,900
Available-for-sale Securities, Fair Value |  | 9,406,920 |  | 9,406,920 |  | 8,639,389
Available-for-sale Securities, Gross Unrealized Gain |  | 98,015 |  | 98,015 |  | 17,936
Available-for-sale Securities, Gross Unrealized Loss |  | (139,267) |  | (139,267) |  | (274,447)
Residential non-agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 758,242 |  | 758,242 |  | 814,542
Available-for-sale Securities, Fair Value |  | 739,972 |  | 739,972 |  | 781,209
Available-for-sale Securities, Gross Unrealized Gain |  | 12,168 |  | 12,168 |  | 11,247
Available-for-sale Securities, Gross Unrealized Loss |  | $ (30,438) |  | $ (30,438) |  | $ (44,580)
[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 4.1 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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