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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Tax Disclosure [Abstract]
Statutory rate	21.00%
Provision at statutory rate	$ 71,161	$ 53,667	$ 60,975
Tax-exempt income:
Tax-exempt interest	(11,066)	(10,776)	(10,243)
Section 291/265 interest disallowance	114	189	435
Company-owned life insurance income	(2,138)	(2,290)	(2,423)
Tax-exempt income	(13,090)	(12,877)	(12,231)
State income taxes	9,308	4,840	6,720
Tax credit investments - federal	(5,212)	(15,159)	(4,411)
Other, net	(843)	(1,324)	1,097
Income tax expense	$ 61,324	$ 29,147	$ 52,150
Effective tax rate	18.10%	11.40%	18.00%

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