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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 10,675,475   $ 10,675,475   $ 13,064,436
Available-for-sale Securities, Fair Value 10,152,663   10,152,663   13,157,817
Available-for-sale Securities, Gross Unrealized Gain 15,193   15,193   207,361
Available-for-sale Securities, Gross Unrealized Loss (538,005)   (538,005)   $ (113,980)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale Securities, Proceeds 156,116 $ 338,109 211,301 $ 394,146  
Available-for-sale Securities, Gross realized gains 1,461 1,767 3,394 2,240  
Available-for-sale Securities, Gross realized losses (273) (337) (1,269) (343)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) $ 278 $ 336 $ 497 $ 455  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1,041   1,041   462
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 8,223,466   $ 8,223,466   $ 4,911,358
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 420,155   420,155   80,372
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,381,849   1,381,849   1,476,208
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 117,850   117,850   33,608
Debt Securities, Available-for-sale, Unrealized Loss Position 9,605,315   9,605,315   6,387,566
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 538,005   538,005   113,980
Asset Pledged as Collateral with Right          
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Pledged Securities 9,700,000   9,700,000   10,200,000
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 46,384   46,384    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,994,203   1,994,203    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 2,546,615   2,546,615    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 469,171   469,171    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 5,056,373   5,056,373    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 46,421   46,421    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,911,712   1,911,712    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 2,317,565   2,317,565    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 444,287   444,287    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 4,719,805   $ 4,719,805    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 6.42   6.42    
U.S. Treasury [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost $ 1,000   $ 1,000   1,001
Available-for-sale Securities, Fair Value 927   927   1,000
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss $ (73)   $ (73)   $ (1)
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 $ 927   $ 927   $ 1,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 73   73   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0   0   0
Debt Securities, Available-for-sale, Unrealized Loss Position 927   927   1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 73   73   1
Municipal securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 686,224   686,224   515,551
Available-for-sale Securities, Fair Value 638,305   638,305   508,365
Available-for-sale Securities, Gross Unrealized Gain 1,039   1,039   1,302
Available-for-sale Securities, Gross Unrealized Loss $ (48,958)   $ (48,958)   $ (8,488)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 207   207   175
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 403,086   $ 403,086   $ 423,575
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 35,397   35,397   7,762
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 116,482   116,482   22,476
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 13,561   13,561   726
Debt Securities, Available-for-sale, Unrealized Loss Position 519,568   519,568   446,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 48,958   48,958   8,488
Commercial agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 4,368,649   4,368,649   4,628,172
Available-for-sale Securities, Fair Value 4,080,101   4,080,101   4,617,025
Available-for-sale Securities, Gross Unrealized Gain 61   61   36,868
Available-for-sale Securities, Gross Unrealized Loss $ (288,609)   $ (288,609)   $ (48,015)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 280   280   165
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,822,610   $ 2,822,610   $ 2,104,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 189,150   189,150   35,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,188,817   1,188,817   703,216
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 99,459   99,459   12,527
Debt Securities, Available-for-sale, Unrealized Loss Position 4,011,427   4,011,427   2,807,905
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 288,609   288,609   48,015
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 472   472   472
Available-for-sale Securities, Gross Unrealized Gain 0   0   0
Available-for-sale Securities, Gross Unrealized Loss $ (28)   $ (28)   $ (28)
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 472   472   472
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 28   28   28
Debt Securities, Available-for-sale, Unrealized Loss Position 472   472   472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 28   28   28
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] 5,619,102   5,619,102    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]          
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 5,432,858   5,432,858    
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 $ 5,088,155   5,088,155   7,908,587
Available-for-sale Securities, Fair Value 4,913,245   4,913,245   8,006,616
Available-for-sale Securities, Gross Unrealized Gain 2,309   2,309   155,477
Available-for-sale Securities, Gross Unrealized Loss $ (177,219)   $ (177,219)   $ (57,448)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 529   529   120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 4,521,335   $ 4,521,335   $ 2,382,094
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 172,417   172,417   37,121
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 76,078   76,078   750,044
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 4,802   4,802   20,327
Debt Securities, Available-for-sale, Unrealized Loss Position 4,597,413   4,597,413   3,132,138
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 177,219   177,219   57,448
Residential non-agency mortgage-backed securities [Member]          
Debt Securities, Available-for-sale [Line Items]          
Available-for-sale Securities, Amortized Cost 530,947   530,947   10,625
Available-for-sale Securities, Fair Value 519,613   519,613   24,339
Available-for-sale Securities, Gross Unrealized Gain 11,784   11,784   13,714
Available-for-sale Securities, Gross Unrealized Loss $ (23,118)   $ (23,118)   $ 0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]          
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 23   23    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 475,508   $ 475,508    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 23,118   23,118    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0   0    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0   0    
Debt Securities, Available-for-sale, Unrealized Loss Position 475,508   475,508    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 23,118   $ 23,118    
[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.