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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, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Provision at statutory rate of 21%	$ 37,598	$ 18,779	$ 59,365	$ 56,830
Tax-exempt income:
Tax-exempt interest	(3,929)	(2,786)	(10,335)	(8,327)
Section 291/265 interest disallowance	85	28	150	92
Company-owned life insurance income	(684)	(483)	(2,340)	(1,582)
Tax-exempt income	(4,528)	(3,241)	(12,525)	(9,817)
State income taxes	7,050	2,282	7,808	7,455
Interim period effective rate adjustment	(31)	1,077	3,042	(1,360)
Tax credit investments - federal	(2,407)	(315)	(4,968)	(2,838)
Other, net	1,205	(902)	2,415	(1,000)
Income tax expense (benefit)	$ 38,887	$ 17,680	$ 55,137	$ 49,270
Effective tax rate	21.70%	19.80%	19.50%	18.20%

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