Income Taxes (Tables)

6 Months Ended

Jun. 30, 2025

Income Tax Disclosure [Abstract]

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

The 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 June 30,						Six Months Ended June 30,
(dollars in thousands)	2025			2024			2025			2024
Provision at statutory rate of 21%	$	32,698		$	32,861		$	70,826		$	64,943
Tax-exempt income:
Tax-exempt interest	(5,599)			(5,027)			(9,851)			(9,985)
Section 291/265 interest disallowance	1,364			957			2,033			1,841
Company-owned life insurance income	(1,397)			(1,178)			(2,532)			(1,872)
Tax-exempt income	(5,632)			(5,248)			(10,350)			(10,016)
State income taxes	5,094			6,333			11,995			11,480
Interim period effective rate adjustment	(159)			(70)			(306)			873
Tax credit investments - federal	(5,156)			(3,106)			(9,258)			(6,160)
Officer compensation limitation	1,436			1,491			1,808			2,256
Non-deductible FDIC premiums	2,816			2,032			4,853			3,779
Other, net	(799)			957			(2,366)			583
Income tax expense	$	30,298		$	35,250		$	67,202		$	67,738
Effective tax rate	19.5		%	22.5		%	19.9		%	21.9		%