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.