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Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Reconciliation of income taxes computed at the United States federal statutory tax rates
Tax at U.S. statutory rate	$ 37,209	$ 44,375	$ 46,794
Increase (decrease) in taxes resulting from:
Tax-exempt interest income	(1,505)	(1,832)	(1,669)
BOLI income	(2,197)	(1,946)	(1,547)
Investment tax credits	(1,901)	(928)	(988)
Amortization of investment in low-income housing tax credits	1,741	683	817
State income tax expense, net of federal benefit	(1,929)	3,241	2,479
Other items, net	1,091	1,647	1,049
Total income tax expense	$ 32,509	$ 45,240	$ 46,935

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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