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Income Taxes - Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate (Detail) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Statutory rate	21.00%
Provision at statutory rate	$ 21,934	$ 5,372
Tax-exempt interest	(2,779)	(2,632)
Section 291/265 interest disallowance	33	73
Company-owned life insurance income	(544)	(647)
Tax-exempt income	(3,290)	(3,206)
State income taxes	2,974	(8)
Interim period effective rate adjustment	(1,775)	3,267
Tax credit investments - federal	(1,092)	(1,902)
Other, net	(1,121)	(584)
Income tax expense	$ 17,630	$ 2,939
Effective tax rate	16.90%	11.50%

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