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Available for Sale Securities (Details)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 12,941,167   $ 12,941,167   $ 12,359,413
Available-for-sale Securities, Fair Value 11,906,647   11,906,647   11,493,860
Available-for-sale Securities, Gross Unrealized Gain 10,029   10,029   28,661
Available-for-sale Securities, Gross Unrealized Loss (1,044,549)   (1,044,549)   $ (894,214)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale Securities, Proceeds 0 $ 30,834 135,489 $ 242,135  
Available-for-sale Securities, Gross realized gains 0 1,116 703 4,510  
Available-for-sale Securities, Gross realized losses 0 (224) (3,713) (1,493)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) $ 0 $ 209 $ (708) $ 706  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1,286   1,286   1,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,374,924   $ 3,374,924   $ 6,173,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 84,298   84,298   376,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8,416,005   8,416,005   3,829,168
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 960,251   960,251   517,616
Debt Securities, Available-for-sale, Unrealized Loss Position 11,790,929   11,790,929   10,002,878
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 1,044,549   1,044,549   894,214
Asset Pledged as Collateral with Right          
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Pledged Securities 13,100,000   13,100,000   11,200,000
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 347,874   347,874    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 3,048,923   3,048,923    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,554,983   1,554,983    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 528,711   528,711    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 5,480,491   5,480,491    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 341,476   341,476    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 2,759,574   2,759,574    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,382,272   1,382,272    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 490,564   490,564    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 4,973,886   $ 4,973,886    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 5.58   5.58    
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 897   897   898
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss $ (103)   $ (103)   $ (102)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0   $ 0   $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 897   897   899
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 103   103   102
Debt Securities, Available-for-sale, Unrealized Loss Position 897   897   899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 103   103   102
Municipal securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 545,940   545,940   687,875
Available-for-sale Securities, Fair Value 488,269   488,269   624,500
Available-for-sale Securities, Gross Unrealized Gain 0   0   321
Available-for-sale Securities, Gross Unrealized Loss $ (57,671)   $ (57,671)   $ (63,696)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 191   191   227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 7,688   $ 7,688   $ 146,634
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 606   606   5,301
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 480,582   480,582   428,248
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 57,065   57,065   58,395
Debt Securities, Available-for-sale, Unrealized Loss Position 488,270   488,270   574,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 57,671   57,671   63,696
Commercial agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 4,933,051   4,933,051   4,892,257
Available-for-sale Securities, Fair Value 4,484,247   4,484,247   4,475,917
Available-for-sale Securities, Gross Unrealized Gain 37   37   3,479
Available-for-sale Securities, Gross Unrealized Loss $ (448,841)   $ (448,841)   $ (419,819)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 302   302   285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 821,238   $ 821,238   $ 1,647,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 20,920   20,920   63,701
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,622,841   3,622,841   2,535,816
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 427,921   427,921   356,118
Debt Securities, Available-for-sale, Unrealized Loss Position 4,444,079   4,444,079   4,183,594
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 448,841   448,841   419,819
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)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1   1   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0   $ 0   $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 473   473   473
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 27   27   27
Debt Securities, Available-for-sale, Unrealized Loss Position 473   473   473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated 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] 7,460,676   7,460,676    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 6,932,761   6,932,761    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 4 years 4 months 24 days        
Residential agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 6,686,602   6,686,602   6,161,358
Available-for-sale Securities, Fair Value 6,216,955   6,216,955   5,814,496
Available-for-sale Securities, Gross Unrealized Gain 162   162   13,085
Available-for-sale Securities, Gross Unrealized Loss $ (469,809)   $ (469,809)   $ (359,947)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 752   752   613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,276,744   $ 2,276,744   $ 3,879,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 55,455   55,455   256,973
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,879,833   3,879,833   863,732
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 414,354   414,354   102,974
Debt Securities, Available-for-sale, Unrealized Loss Position 6,156,577   6,156,577   4,743,314
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 469,809   469,809   359,947
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 774,074   774,074   616,423
Available-for-sale Securities, Fair Value 715,806   715,806   577,576
Available-for-sale Securities, Gross Unrealized Gain 9,830   9,830   11,776
Available-for-sale Securities, Gross Unrealized Loss $ (68,098)   $ (68,098)   $ (50,623)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 39   39   26
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 269,254   $ 269,254   $ 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7,317   7,317   50,623
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 431,379   431,379   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 60,781   60,781   0
Debt Securities, Available-for-sale, Unrealized Loss Position 700,633   700,633   499,716
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 68,098   $ 68,098   $ 50,623
[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 4.4 years based upon current prepayment assumptions.