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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, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Statutory rate			21.00%
Provision at statutory rate of 21%	$ 18,779	$ 18,920	$ 56,830	$ 37,200
Tax-exempt income:
Tax-exempt interest	(2,786)	(2,682)	(8,327)	(7,985)
Section 291/265 interest disallowance	28	36	92	153
Company-owned life insurance income	(483)	(386)	(1,582)	(1,657)
Tax-exempt income	(3,241)	(3,032)	(9,817)	(9,489)
State income taxes	2,282	656	7,455	2,367
Interim period effective rate adjustment	1,077	(2,501)	(1,360)	840
Tax credit investments - federal	(315)	(2,575)	(2,838)	(6,296)
Other, net	(902)	686	(1,000)	232
Income tax expense	$ 17,680	$ 12,154	$ 49,270	$ 24,854
Effective tax rate	19.80%	13.50%	18.20%	14.00%

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