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v3.24.3

Available for Sale Securities (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 13,323,346 |  | $ 13,323,346 |  | $ 12,903,305
Available-for-sale Securities, Fair Value |  | 13,015,986 |  | 13,015,986 |  | 12,286,681
Available-for-sale Securities, Gross Unrealized Gain |  | 117,579 |  | 117,579 |  | 52,821
Available-for-sale Securities, Gross Unrealized Loss |  | (424,939) |  | (424,939) |  | (669,445)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Proceeds |  | 101,522 | $ 0 | 839,352 | $ 135,489 |
Available-for-sale Securities, Gross realized gains |  | 1,802 | 0 | 2,257 | 703 |
Available-for-sale Securities, Gross realized losses |  | (2,493) | 0 | (48,085) | (3,713) |
Available-for-sale Securities, Related federal and state income tax expense (benefit) |  | (163) | $ 0 | (10,779) | $ (708) |
Asset Pledged as Collateral with Right |  |  |  |  |  |
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract] |  |  |  |  |  |
Pledged Securities |  | 10,500,000 |  | 10,500,000 |  | 13,900,000
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 |  | 317,443 |  | 317,443 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis |  | 2,432,178 |  | 2,432,178 |  |
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis |  | 631,714 |  | 631,714 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis |  | 436,923 |  | 436,923 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost |  | 3,818,258 |  | 3,818,258 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value |  | 314,948 |  | 314,948 |  |
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value |  | 2,274,047 |  | 2,274,047 |  |
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value |  | 585,305 |  | 585,305 |  |
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value |  | 424,975 |  | 424,975 |  |
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value |  | $ 3,599,275 |  | $ 3,599,275 |  |
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity | [1] | 5.10 |  | 5.10 |  |
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 |  | 951 |  | 951 |  | 925
Available-for-sale Securities, Gross Unrealized Gain |  | 0 |  | 0 |  | 0
Available-for-sale Securities, Gross Unrealized Loss |  | (49) |  | (49) |  | (75)
Municipal securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 241,447 |  | 241,447 |  | 544,707
Available-for-sale Securities, Fair Value |  | 228,171 |  | 228,171 |  | 502,833
Available-for-sale Securities, Gross Unrealized Gain |  | 7 |  | 7 |  | 1
Available-for-sale Securities, Gross Unrealized Loss |  | (13,283) |  | (13,283) |  | (41,875)
Commercial agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 3,575,311 |  | 3,575,311 |  | 4,456,918
Available-for-sale Securities, Fair Value |  | 3,369,680 |  | 3,369,680 |  | 4,147,853
Available-for-sale Securities, Gross Unrealized Gain |  | 3,857 |  | 3,857 |  | 2,972
Available-for-sale Securities, Gross Unrealized Loss |  | (209,488) |  | (209,488) |  | (312,037)
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] | 9,505,088 |  | 9,505,088 |  |
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract] |  |  |  |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value |  | $ 9,416,711 |  | 9,416,711 |  |
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities |  | 3 years 10 months 24 days |  |  |  |
Residential agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | $ 8,649,078 |  | 8,649,078 |  | 7,066,645
Available-for-sale Securities, Fair Value |  | 8,577,928 |  | 8,577,928 |  | 6,834,720
Available-for-sale Securities, Gross Unrealized Gain |  | 98,405 |  | 98,405 |  | 36,983
Available-for-sale Securities, Gross Unrealized Loss |  | (169,555) |  | (169,555) |  | (268,908)
Residential non-agency mortgage-backed securities [Member] |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost |  | 856,010 |  | 856,010 |  | 833,535
Available-for-sale Securities, Fair Value |  | 838,783 |  | 838,783 |  | 799,877
Available-for-sale Securities, Gross Unrealized Gain |  | 15,310 |  | 15,310 |  | 12,865
Available-for-sale Securities, Gross Unrealized Loss |  | $ (32,537) |  | $ (32,537) |  | $ (46,523)
[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 3.9 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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