Securities Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-sale, Unrealized Loss Position [Line Items]
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	934	1,202
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 603,291	$ 3,846,190
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	6,167,256	6,381,398
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	6,770,547	10,227,588
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	2,248	53,117
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	318,279	514,129
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 320,527	$ 567,246
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	972	945
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	972	945
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	55
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 28	$ 55
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	89	113
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 1,035	$ 1,041
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	186,386	222,432
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	187,421	223,473
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1	13
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	8,015	14,949
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 8,016	$ 14,962
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	606	831
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 456,786	$ 3,561,318
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,919,538	2,880,641
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	3,376,324	6,441,959
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	1,936	50,102
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	137,331	224,345
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 139,267	$ 274,447
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	33	36
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 44,977	$ 93,113
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	442,525	457,701
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	487,502	550,814
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	84	1,124
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	30,354	43,456
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 30,438	$ 44,580
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	204	220
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than Twelve Months, Fair Value	$ 100,493	$ 190,718
Available-for-sale Securities, Continuous Unrealized Loss Position, Twelve Months or Longer, Fair Value	2,617,362	2,819,206
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	2,717,855	3,009,924
Available-for-sale Securities, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss	227	1,878
Available-for-sale Securities, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss	142,524	231,297
Available-for-sale Securities, Continuous Unrealized Loss Position, Accumulated Loss	$ 142,751	$ 233,175
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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