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Securities Securities - Amortized Cost, Allowance for Credit Losses and Estimated Fair Value of Securities Available for Sale (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	$ 18,267,359	$ 16,602,158
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	26,288	4,845
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	1,429,175	1,563,378
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Securities available for sale, at estimated fair value	16,864,472	15,043,625
US Treasury Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	3,695,654	3,692,215
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	204,459	249,895
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Securities available for sale, at estimated fair value	3,491,195	3,442,320
Residential Mortgage Backed Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	9,577,323	8,024,704
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	25,377	2,352
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	911,753	1,029,154
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Securities available for sale, at estimated fair value	8,690,947	6,997,902
US States and Political Subdivisions Debt Securities [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	4,951,109	4,842,060
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	911	2,493
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	312,963	284,329
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Securities available for sale, at estimated fair value	4,639,057	4,560,224
Other Investments [Member]
Schedule of Investments [Line Items]
Debt Securities, Available-for-sale, Amortized Cost	43,273	43,179
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax	0	0
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax	0	0
Debt Securities, Available-for-sale, Allowance for Credit Loss	0	0
Securities available for sale, at estimated fair value	$ 43,273	$ 43,179

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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