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Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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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 | 1,041 | 462
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 8,223,466 | $ 4,911,358
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,381,849 | 1,476,208
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 9,605,315 | 6,387,566
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 420,155 | 80,372
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 117,850 | 33,608
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 538,005 | $ 113,980
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 | $ 927 | $ 1,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 927 | 1,000
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 73 | 1
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 | 0
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 73 | $ 1
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 | 207 | 175
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 403,086 | $ 423,575
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 116,482 | 22,476
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 519,568 | 446,051
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 35,397 | 7,762
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 13,561 | 726
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 48,958 | $ 8,488
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 | 529 | 120
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 4,521,335 | $ 2,382,094
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 76,078 | 750,044
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4,597,413 | 3,132,138
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 172,417 | 37,121
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 4,802 | 20,327
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 177,219 | $ 57,448
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 | 23 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 475,508 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 475,508 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 23,118 |
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 0 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 23,118 |
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 | 280 | 165
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value | $ 2,822,610 | $ 2,104,689
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value | 1,188,817 | 703,216
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 4,011,427 | 2,807,905
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 189,150 | 35,488
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 99,459 | 12,527
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 288,609 | $ 48,015
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 | 472 | 472
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value | 472 | 472
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 | 28 | 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss | $ 28 | $ 28

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