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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income Tax Disclosure [Abstract]
Provision at statutory rate	$ 38,867	$ 40,358	$ 103,810	$ 122,352
Tax-exempt income:
Tax-exempt interest	(4,871)	(4,625)	(14,856)	(13,716)
Section 291/265 interest disallowance	927	675	2,768	1,593
Company-owned life insurance income	(1,089)	(743)	(2,961)	(2,315)
Tax-exempt income	(5,033)	(4,693)	(15,049)	(14,438)
State income taxes	7,485	8,163	18,965	24,856
Interim period effective rate adjustment	1,096	116	1,969	(607)
Tax credit investments - federal	(3,619)	(2,071)	(9,780)	(7,122)
Officer compensation limitation	765	1,040	3,021	3,120
Non-deductible FDIC premiums	2,462	1,949	6,241	6,096
Other, net	(743)	(558)	(159)	(1,139)
Income tax expense	$ 41,280	$ 44,304	$ 109,018	$ 133,118
Effective tax rate	22.30%	23.10%	22.10%	22.90%

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