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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 13,443,020   $ 13,443,020   $ 12,903,305
Available-for-sale Securities, Fair Value 12,793,784   12,793,784   12,286,681
Available-for-sale Securities, Gross Unrealized Gain 23,578   23,578   52,821
Available-for-sale Securities, Gross Unrealized Loss (672,814)   (672,814)   (669,445)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale Securities, Proceeds 1,836 $ 135,489 737,830 $ 135,489  
Available-for-sale Securities, Gross realized gains 222 703 455 703  
Available-for-sale Securities, Gross realized losses (188) (3,713) (45,592) (3,713)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 8 $ (708) (10,616) $ (708)  
Asset Pledged as Collateral with Right          
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Pledged Securities 12,600,000   12,600,000   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 415,221   415,221    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 2,459,948   2,459,948    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 852,408   852,408    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 443,805   443,805    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 4,171,382   4,171,382    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 411,548   411,548    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 2,242,456   2,242,456    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 780,072   780,072    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 423,092   423,092    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 3,857,168   $ 3,857,168    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 5.08   5.08    
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 923   923   925
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss (77)   (77)   (75)
Municipal securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 301,294   301,294   544,707
Available-for-sale Securities, Fair Value 278,043   278,043   502,833
Available-for-sale Securities, Gross Unrealized Gain 0   0   1
Available-for-sale Securities, Gross Unrealized Loss (23,251)   (23,251)   (41,875)
Commercial agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 3,868,588   3,868,588   4,456,918
Available-for-sale Securities, Fair Value 3,577,729   3,577,729   4,147,853
Available-for-sale Securities, Gross Unrealized Gain 816   816   2,972
Available-for-sale Securities, Gross Unrealized Loss (291,675)   (291,675)   (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] 9,271,637   9,271,637    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 8,936,615   8,936,615    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 3 months 18 days        
Residential agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 8,401,476   8,401,476   7,066,645
Available-for-sale Securities, Fair Value 8,108,567   8,108,567   6,834,720
Available-for-sale Securities, Gross Unrealized Gain 12,321   12,321   36,983
Available-for-sale Securities, Gross Unrealized Loss (305,230)   (305,230)   (268,908)
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 870,162   870,162   833,535
Available-for-sale Securities, Fair Value 828,049   828,049   799,877
Available-for-sale Securities, Gross Unrealized Gain 10,441   10,441   12,865
Available-for-sale Securities, Gross Unrealized Loss $ (52,554)   $ (52,554)   $ (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 4.3 years based upon current prepayment assumptions.