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Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details)
$ in Thousands
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 1,206 1,123
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,394,198 $ 1,205,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 7,577,536 8,087,455
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 10,971,734 9,293,277
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27,398 7,969
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 645,416 661,476
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 672,814 $ 669,445
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 923 925
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 923 925
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 77 75
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 77 $ 75
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 130 190
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 11,009 $ 6,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 257,764 494,955
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 268,773 501,754
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 58 410
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 23,193 41,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 23,251 $ 41,875
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 793 630
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,033,904 $ 690,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,650,900 3,717,975
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 6,684,804 4,408,093
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 24,223 3,689
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 281,007 265,219
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 305,230 $ 268,908
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 41 32
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 166,281 $ 116,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 515,977 451,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 682,258 567,447
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 1,108 1,244
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 51,446 45,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 52,554 $ 46,523
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 240 269
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 183,004 $ 392,828
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 3,151,499 3,421,757
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 3,334,503 3,814,585
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,009 2,626
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 289,666 309,411
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 291,675 $ 312,037
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