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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, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Provision at statutory rate of 21%	$ 40,358	$ 37,598	$ 122,352	$ 59,365
Tax-exempt income:
Tax-exempt interest	(4,625)	(3,929)	(13,716)	(10,335)
Section 291/265 interest disallowance	675	85	1,593	150
Company-owned life insurance income	(743)	(684)	(2,315)	(2,340)
Tax-exempt income	(4,693)	(4,528)	(14,438)	(12,525)
State income taxes	8,163	7,050	24,856	7,808
Interim period effective rate adjustment	116	(31)	(607)	3,042
Tax credit investments - federal	(2,071)	(2,407)	(7,122)	(4,968)
Officer compensation limitation	1,040	401	3,120	1,053
Non-deductible FDIC premiums	1,949	1,178	6,096	2,549
Other, net	(558)	(374)	(1,139)	(1,187)
Income tax expense (benefit)	$ 44,304	$ 38,887	$ 133,118	$ 55,137
Effective tax rate	23.10%	21.70%	22.90%	19.50%

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