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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 13,119,840   $ 12,609,850
Available-for-sale Securities, Fair Value 13,410,057   13,050,665
Available-for-sale Securities, Gross Unrealized Gain 358,610   449,654
Available-for-sale Securities, Gross Unrealized Loss (68,393)   (8,839)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale Securities, Proceeds 56,037 $ 26,894  
Available-for-sale Securities, Gross realized gains 473 3  
Available-for-sale Securities, Gross realized losses (6) 0  
Available-for-sale Securities, Related federal and state income tax expense (benefit) 119 $ 1  
Pledged Assets Separately Reported, Securities Pledged as Collateral, at Fair Value $ 11,200,000   $ 11,600,000
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 232   77
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,903,355   $ 1,143,562
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 67,232   8,197
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 445,591   438,846
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,161   642
Debt Securities, Available-for-sale, Unrealized Loss Position 4,348,946   1,582,408
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 68,393   8,839
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 71,119    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 1,562,072    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 1,379,950    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 607,208    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 3,620,349    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 71,223    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 1,610,227    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 1,373,270    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 618,641    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 3,673,361    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 7.76    
U.S. Treasury [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 500   500
Available-for-sale Securities, Fair Value 506   508
Available-for-sale Securities, Gross Unrealized Gain 6   8
Available-for-sale Securities, Gross Unrealized Loss 0   0
Municipal securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 248,016   165,318
Available-for-sale Securities, Fair Value 245,657   167,979
Available-for-sale Securities, Gross Unrealized Gain 1,422   2,666
Available-for-sale Securities, Gross Unrealized Loss $ (3,781)   $ (5)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 81   1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 186,267   $ 6,166
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 3,781   5
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 186,267   6,166
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 3,781   5
Commercial agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 3,371,333   3,406,956
Available-for-sale Securities, Fair Value 3,426,727   3,508,465
Available-for-sale Securities, Gross Unrealized Gain 74,722   103,590
Available-for-sale Securities, Gross Unrealized Loss $ (19,328)   $ (2,081)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 60   37
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 711,113   $ 350,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 18,623   1,587
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 305,406   277,627
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 705   494
Debt Securities, Available-for-sale, Unrealized Loss Position 1,016,519   628,133
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 19,328   2,081
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 471   472
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (29)   $ (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 471   472
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 29   28
Debt Securities, Available-for-sale, Unrealized Loss Position 471   472
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 29   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] 9,499,491    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 9,736,696    
Available-for-sale Securities, Debt Maturities, Average Expected Life of Mortgage-backed Securities 3.9 years    
Residential agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 9,483,601   9,019,013
Available-for-sale Securities, Fair Value 9,705,314   9,340,471
Available-for-sale Securities, Gross Unrealized Gain 266,968   328,183
Available-for-sale Securities, Gross Unrealized Loss $ (45,255)   $ (6,725)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 90   38
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,005,975   $ 786,890
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 44,828   6,605
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 139,714   160,747
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 427   120
Debt Securities, Available-for-sale, Unrealized Loss Position 3,145,689   947,637
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 45,255   6,725
Residential non-agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 15,890   17,563
Available-for-sale Securities, Fair Value 31,382   32,770
Available-for-sale Securities, Gross Unrealized Gain 15,492   15,207
Available-for-sale Securities, Gross Unrealized Loss $ 0   $ 0
[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 3.9 years based upon current prepayment assumptions.