Income Taxes (Tables)

3 Months Ended

Mar. 31, 2023

Income Tax Disclosure [Abstract]

Summary of Differences in Taxes from Continuing Operations Computed at Statutory Rate

Following is a summary of the major items comprising the differences in taxes from continuing operations computed at the federal statutory rate and as recorded in the consolidated statements of income:

	Three Months Ended March 31,
(dollars in thousands)	2023			2022
Provision at statutory rate of 21%	$	39,484		$	(7,623)
Tax-exempt income:
Tax-exempt interest	(4,486)			(2,992)
Section 291/265 interest disallowance	386			28
Company-owned life insurance income	(627)			(718)
Tax-exempt income	(4,727)			(3,682)
State income taxes	8,142			(3,327)
Interim period effective rate adjustment	(1,717)			7,040
Tax credit investments - federal	(2,526)			(1,270)
Officer compensation limitation	1,040			—
Other, net	1,725			148
Income tax expense (benefit)	$	41,421		$	(8,714)
Effective tax rate	22.0		%	24.0		%