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v3.25.2

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 13,624,499 |  | $ 13,624,499 |  | $ 13,388,935
Available-for-sale Securities, Fair Value |  | 13,347,821 |  | 13,347,821 |  | 12,851,600
Available-for-sale Securities, Gross Unrealized Gain |  | 94,715 |  | 94,715 |  | 29,911
Available-for-sale Securities, Gross Unrealized Loss |  | (371,393) |  | (371,393) |  | (567,246)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Proceeds |  | 0 | $ 1,836 | 0 | $ 737,830 |
Available-for-sale Securities, Gross realized gains |  | 0 | 222 | 0 | 455 |
Available-for-sale Securities, Gross realized losses |  | 0 | (188) | 0 | (45,592) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | 0 | $ 8 | 0 | $ (10,616) |
Asset Pledged as Collateral with Right |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Pledged Securities |  | 12,300,000 |  | 12,300,000 |  | 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 |  | 329,935 |  | 329,935 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 2,432,720 |  | 2,432,720 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 475,593 |  | 475,593 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 433,476 |  | 433,476 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 3,671,724 |  | 3,671,724 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 323,803 |  | 323,803 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 2,304,224 |  | 2,304,224 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 450,275 |  | 450,275 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 423,342 |  | 423,342 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 3,501,644 |  | $ 3,501,644 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 4.83 |  | 4.83 |  |
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 |  | 964 |  | 964 |  | 945
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | (36) |  | (36) |  | (55)
Municipal securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 218,408 |  | 218,408 |  | 240,528
Available-for-sale Securities, Fair Value |  | 208,350 |  | 208,350 |  | 225,568
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 2
Available-for-sale Securities, Gross Unrealized Loss |  | (10,058) |  | (10,058) |  | (14,962)
Commercial agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 3,451,816 |  | 3,451,816 |  | 3,436,465
Available-for-sale Securities, Fair Value |  | 3,291,857 |  | 3,291,857 |  | 3,204,016
Available-for-sale Securities, Gross Unrealized Gain |  | 5,712 |  | 5,712 |  | 726
Available-for-sale Securities, Gross Unrealized Loss |  | (165,671) |  | (165,671) |  | (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] | 9,952,775 |  | 9,952,775 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 9,846,177 |  | 9,846,177 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 4 years 2 months 12 days |  |  |  |
Residential agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 9,187,687 |  | 9,187,687 |  | 8,895,900
Available-for-sale Securities, Fair Value |  | 9,102,658 |  | 9,102,658 |  | 8,639,389
Available-for-sale Securities, Gross Unrealized Gain |  | 76,933 |  | 76,933 |  | 17,936
Available-for-sale Securities, Gross Unrealized Loss |  | (161,962) |  | (161,962) |  | (274,447)
Residential non-agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 765,088 |  | 765,088 |  | 814,542
Available-for-sale Securities, Fair Value |  | 743,519 |  | 743,519 |  | 781,209
Available-for-sale Securities, Gross Unrealized Gain |  | 12,070 |  | 12,070 |  | 11,247
Available-for-sale Securities, Gross Unrealized Loss |  | $ (33,639) |  | $ (33,639) |  | $ (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 4.2 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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