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Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
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Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items] |  |
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions | 1,131 | 1,123
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,562,022 | $ 1,205,822
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 7,483,659 | 8,087,455
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 10,045,681 | 9,293,277
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 13,686 | 7,969
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 662,008 | 661,476
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 675,694 | $ 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 | 920 | 925
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 920 | 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 | 80 | 75
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 80 | $ 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 | 135 | 190
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 3,139 | $ 6,799
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 298,162 | 494,955
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 301,301 | 501,754
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 30 | 410
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 24,360 | 41,465
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 24,390 | $ 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 | 711 | 630
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,179,355 | $ 690,118
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,502,950 | 3,717,975
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 5,682,306 | 4,408,093
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 10,501 | 3,689
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 288,296 | 265,219
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 298,797 | $ 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 | 38 | 32
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 138,197 | $ 116,077
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 532,619 | 451,370
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 670,815 | 567,447
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 530 | 1,244
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 48,829 | 45,279
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 49,359 | $ 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 | 245 | 269
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 241,331 | $ 392,828
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 3,148,535 | 3,421,757
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 3,389,866 | 3,814,585
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 2,625 | 2,626
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 300,416 | 309,411
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 303,041 | $ 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

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