Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Reconciliation of provision for tax from the federal rate to the effective tax rate [Abstract]
Income tax computed at statutory tax rate	$ 36,837	$ 39,854	$ 36,497
Tax exempt interest	(3,935)	(4,284)	(4,951)
Nondeductible interest expense	106	247	564
State income taxes, net	1,673	7,457	5,645
Income tax credits, net	(10,479)	(9,375)	(13,473)
Death benefit gains	(175)	(91)	(123)
Other	4,021	(4,051)	(826)
Income tax provision	$ 28,048	$ 29,757	$ 23,333