Investment Securities, Equity Securities with Readily Determinable Fair Values and Other Investments - Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Available for sale:
Fair value, less than 12 months	$ 2,088,750	$ 134,922
Unrealized losses, less than 12 Months	(61,411)	(140)
Fair value, 12 months or more	2,642,555	3,108,044
Unrealized losses, 12 Months or More	(425,133)	(337,527)
Fair value, Total	4,731,305	3,242,966
Unrealized losses, Total	(486,544)	(337,667)
Residential mortgage-backed securities
Available for sale:
Fair value, less than 12 months	2,066,671	130,561
Unrealized losses, less than 12 Months	(59,920)	(81)
Fair value, 12 months or more	2,546,723	3,002,781
Unrealized losses, 12 Months or More	(407,418)	(332,103)
Fair value, Total	4,613,394	3,133,342
Unrealized losses, Total	(467,338)	(332,184)
Obligations of states and political subdivisions
Available for sale:
Fair value, less than 12 months	22,079	4,361
Unrealized losses, less than 12 Months	(1,491)	(59)
Fair value, 12 months or more	95,832	105,263
Unrealized losses, 12 Months or More	(17,715)	(5,424)
Fair value, Total	117,911	109,624
Unrealized losses, Total	$ (19,206)	$ (5,483)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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