Parent Company Financial Statements - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Goodwill and other intangibles, net	$ 566,205	$ 568,009
Deferred income taxes, net	266,185	331,963
Other assets	536,267	426,863
Total assets	21,133,278	22,646,858
Liabilities [Abstract]
Other liabilities	513,990	424,951
Total liabilities	18,158,423	20,175,068
Equity, Attributable to Parent [Abstract]
Total shareholders’ equity	2,974,855	2,471,790	$ 3,406,352	$ 3,428,052
Total liabilities and shareholders’ equity	21,133,278	22,646,858
Parent Company
Assets
Cash and cash equivalents	118,256	126,441
Goodwill and other intangibles, net	744	744
Deferred income taxes, net	6,763	13,182
Investment in subsidiaries	2,842,099	2,327,521
Other assets	8,202	4,557
Total assets	2,976,064	2,472,445
Liabilities [Abstract]
Other liabilities	1,209	655
Total liabilities	1,209	655
Equity, Attributable to Parent [Abstract]
Total shareholders’ equity	2,974,855	2,471,790
Total liabilities and shareholders’ equity	2,976,064	2,472,445
Other/Eliminations
Assets
Cash and cash equivalents	$ 116,700	$ 125,000