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Available for Sale Securities (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 12,679,349   $ 12,359,413
Available-for-sale Securities, Fair Value 11,937,841   11,493,860
Available-for-sale Securities, Gross Unrealized Gain 33,726   28,661
Available-for-sale Securities, Gross Unrealized Loss (775,234)   $ (894,214)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale Securities, Proceeds 0 $ 55,185  
Available-for-sale Securities, Gross realized gains 0 1,933  
Available-for-sale Securities, Gross realized losses 0 (996)  
Available-for-sale Securities, Related federal and state income tax expense (benefit) $ 0 $ 219  
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1,153   1,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,648,291   $ 6,173,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 60,748   376,598
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7,485,234   3,829,168
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 714,486   517,616
Debt Securities, Available-for-sale, Unrealized Loss Position 10,133,525   10,002,878
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 775,234   894,214
Asset Pledged as Collateral with Right      
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Pledged Securities 9,900,000   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 148,742    
Available-for-sale Securities, Debt Maturities, One to Five Years, Amortized Cost Basis 2,665,838    
Available-for-sale Securities, Debt Maturities, Six To Ten Years, Amortized Cost Basis 2,360,090    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Amortized Cost Basis 502,606    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Amortized Cost 5,677,276    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, Less than One Year, Fair Value 146,996    
Available-for-sale Securities, Debt Maturities, One to Five Years, Fair Value 2,510,112    
Available-for-sale Securities, Debt Maturities, Six to Ten Years, Fair Value 2,131,783    
Available-for-sale Securities, Debt Maturities, Over Ten Years, Fair Value 474,891    
Available-for-sale Securities, Debt Maturities, Allocated and Single Maturity Date, Fair Value $ 5,263,782    
Available-for-sale Securities, Debt Maturities, Weighted Average Maturity [1] 5.82    
U.S. Treasury [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost $ 1,000   1,000
Available-for-sale Securities, Fair Value 914   898
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (86)   $ (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
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 914   899
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 86   102
Debt Securities, Available-for-sale, Unrealized Loss Position 914   899
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 86   102
Municipal securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 685,963   687,875
Available-for-sale Securities, Fair Value 634,207   624,500
Available-for-sale Securities, Gross Unrealized Gain 1,338   321
Available-for-sale Securities, Gross Unrealized Loss $ (53,094)   $ (63,696)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 215   227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 61,983   $ 146,634
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 767   5,301
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 487,032   428,248
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 52,327   58,395
Debt Securities, Available-for-sale, Unrealized Loss Position 549,015   574,882
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 53,094   63,696
Commercial agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 4,989,813   4,892,257
Available-for-sale Securities, Fair Value 4,628,188   4,475,917
Available-for-sale Securities, Gross Unrealized Gain 5,738   3,479
Available-for-sale Securities, Gross Unrealized Loss $ (367,363)   $ (419,819)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 288   285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 824,751   $ 1,647,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 14,313   63,701
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,413,042   2,535,816
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 353,050   356,118
Debt Securities, Available-for-sale, Unrealized Loss Position 4,237,793   4,183,594
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 367,363   419,819
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 473   473
Available-for-sale Securities, Gross Unrealized Gain 0   0
Available-for-sale Securities, Gross Unrealized Loss $ (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
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 473   473
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 27   27
Debt Securities, Available-for-sale, Unrealized Loss Position 473   473
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 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] 7,002,073    
Debt Securities, Available-for-sale, Maturity, Fair Value, Rolling Maturity [Abstract]      
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value $ 6,674,059    
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 $ 6,311,728   6,161,358
Available-for-sale Securities, Fair Value 6,022,708   5,814,496
Available-for-sale Securities, Gross Unrealized Gain 15,379   13,085
Available-for-sale Securities, Gross Unrealized Loss $ (304,399)   $ (359,947)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 618   613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,531,016   $ 3,879,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 37,020   256,973
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,240,193   863,732
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 267,379   102,974
Debt Securities, Available-for-sale, Unrealized Loss Position 4,771,209   4,743,314
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss 304,399   359,947
Residential non-agency mortgage-backed securities [Member]      
Debt Securities, Available-for-sale [Line Items]      
Available-for-sale Securities, Amortized Cost 690,345   616,423
Available-for-sale Securities, Fair Value 651,351   577,576
Available-for-sale Securities, Gross Unrealized Gain 11,271   11,776
Available-for-sale Securities, Gross Unrealized Loss $ (50,265)   $ (50,623)
Debt Securities, Available-for-sale, Realized Gain (Loss) [Abstract]      
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 30   26
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 230,541   $ 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 8,648   50,623
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 343,580   0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 41,617   0
Debt Securities, Available-for-sale, Unrealized Loss Position 574,121   499,716
Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss $ 50,265   $ 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 years based upon current prepayment assumptions.