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Loans and Allowance for Credit Losses, Loans by Portfolio Type (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	$ 6,741,407	$ 6,739,706
Loans, variable rate of interest	16,865,561	17,328,293
Nonaccrual	83,520	46,725
Loans	23,690,488	24,114,724
Credit Commitments [Abstract]
Outstanding commitments to extend credit	14,500,000
Outstanding standby letters of credit	698,000
Commercial [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	3,410,759	3,450,238
Loans, variable rate of interest	10,949,605	11,565,251
Nonaccrual	43,067	14,647
Loans	14,403,431	15,030,136
Commercial real estate [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	668,160	668,532
Loans, variable rate of interest	4,482,251	4,380,015
Nonaccrual	13,125	9,905
Loans	5,163,536	5,058,452
Loans to individuals [Member]
Loan receivables disclosure [Abstract]
Loans, fixed rate of interest	2,662,488	2,620,936
Loans, variable rate of interest	1,433,705	1,383,027
Nonaccrual	27,328	22,173
Loans	$ 4,123,521	$ 4,026,136

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Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease.

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