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Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]    
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions 260 77
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 3,816,148 $ 1,143,562
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 535,041 438,846
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 4,351,189 1,582,408
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 40,020 8,197
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,789 642
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 41,809 $ 8,839
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 91 1
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 260,980 $ 6,166
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 260,980 6,166
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 2,546 5
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 $ 2,546 $ 5
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 88 38
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 2,508,370 $ 786,890
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 190,052 160,747
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 2,698,422 947,637
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 27,595 6,605
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 1,372 120
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 28,967 $ 6,725
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 80 37
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value $ 1,046,798 $ 350,506
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value 344,518 277,627
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 1,391,316 628,133
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss 9,879 1,587
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss 388 494
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 10,267 $ 2,081
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 471 472
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value 471 472
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 29 28
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss $ 29 $ 28