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Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1,286 1,153
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,374,924 $ 6,173,710
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 8,416,005 3,829,168
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 11,790,929 10,002,878
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 84,298 376,598
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 960,251 517,616
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 1,044,549 $ 894,214
U.S. Treasury [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
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, Twelve Months or Longer, Fair Value 897 899
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 897 899
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 103 102
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 103 $ 102
Municipal securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 191 227
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 7,688 $ 146,634
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 480,582 428,248
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 488,270 574,882
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 606 5,301
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 57,065 58,395
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 57,671 $ 63,696
Residential agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 752 613
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,276,744 $ 3,879,582
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,879,833 863,732
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 6,156,577 4,743,314
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 55,455 256,973
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 414,354 102,974
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 469,809 $ 359,947
Residential non-agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 39 26
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 269,254 $ 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 431,379 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 700,633 499,716
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 7,317 50,623
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 60,781 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 68,098 $ 50,623
Commercial agency mortgage-backed securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 302 285
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 821,238 $ 1,647,778
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,622,841 2,535,816
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,444,079 4,183,594
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 20,920 63,701
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 427,921 356,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 448,841 $ 419,819
Other debt securities [Member]    
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
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, Twelve Months or Longer, Fair Value 473 473
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 473 473
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 0 0
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 27 27
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 27 $ 27