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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 13,441,131   $ 13,064,436
Available-for-sale Securities, Fair Value 12,894,534   13,157,817
Available-for-sale Securities, Gross Unrealized Gain 30,959   207,361
Available-for-sale Securities, Gross Unrealized Loss (577,556)   $ (113,980)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale Securities, Proceeds 55,185 $ 56,037  
Available-for-sale Securities, Gross realized gains 1,933 473  
Available-for-sale Securities, Gross realized losses (996) (6)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) $ 219 $ 119  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 965   462
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 8,821,791   $ 4,911,358
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 400,881   80,372
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 2,297,660   1,476,208
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 176,675   33,608
Debt Securities, Available-for-sale, Unrealized Loss Position 11,119,451   6,387,566
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 577,556   113,980
Asset Pledged as Collateral with Right      
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Debt Securities 10,000,000   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 48,510    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,968,389    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 2,683,456    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 487,112    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 5,187,467    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 48,612    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,911,239    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 2,507,611    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 467,864    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 4,935,326    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 6.59    
U.S. Treasury [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 1,000   1,001
Available-for-sale Securities, Fair Value 947   1,000
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (53)   $ (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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 947   $ 1,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 53   1
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 947   1,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 53   1
Municipal securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 562,065   515,551
Available-for-sale Securities, Fair Value 526,322   508,365
Available-for-sale Securities, Gross Unrealized Gain 144   1,302
Available-for-sale Securities, Gross Unrealized Loss $ (35,887)   $ (8,488)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 202   175
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 400,690   $ 423,575
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 26,297   7,762
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 111,502   22,476
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 9,590   726
Debt Securities, Available-for-sale, Unrealized Loss Position 512,192   446,051
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 35,887   8,488
Commercial agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 4,623,902   4,628,172
Available-for-sale Securities, Fair Value 4,407,585   4,617,025
Available-for-sale Securities, Gross Unrealized Gain 2,809   36,868
Available-for-sale Securities, Gross Unrealized Loss $ (219,126)   $ (48,015)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 238   165
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,988,497   $ 2,104,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 177,409   35,488
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 773,363   703,216
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 41,717   12,527
Debt Securities, Available-for-sale, Unrealized Loss Position 3,761,860   2,807,905
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 219,126   48,015
Other debt securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 500   500
Available-for-sale Securities, Fair Value 472   472
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (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
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 0   $ 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0   0
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 472   472
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 28   28
Debt Securities, Available-for-sale, Unrealized Loss Position 472   472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 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] 8,253,664    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 7,959,208    
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 $ 7,913,760   7,908,587
Available-for-sale Securities, Fair Value 7,612,021   8,006,616
Available-for-sale Securities, Gross Unrealized Gain 14,727   155,477
Available-for-sale Securities, Gross Unrealized Loss $ (316,466)   $ (57,448)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 508   120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 5,127,508   $ 2,382,094
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 191,126   37,121
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 1,412,323   750,044
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 125,340   20,327
Debt Securities, Available-for-sale, Unrealized Loss Position 6,539,831   3,132,138
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 316,466   57,448
Residential non-agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 339,904   10,625
Available-for-sale Securities, Fair Value 347,187   24,339
Available-for-sale Securities, Gross Unrealized Gain 13,279   13,714
Available-for-sale Securities, Gross Unrealized Loss $ (5,996)   $ 0
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 15    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 304,149    
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 5,996    
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 0    
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 0    
Debt Securities, Available-for-sale, Unrealized Loss Position 304,149    
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 5,996    
[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.