Parent Company Only Financial Information, Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income
Interest income on notes receivable from subsidiaries	$ 1,720,406	$ 992,642	$ 693,729
Total revenue	1,102,756	1,239,691	1,058,219
Expense
Income before income tax expense	206,052	459,630	436,307
Income tax expense	23,097	93,508	85,313
Net income	182,956	366,122	350,994
Preferred stock dividends	11,500	11,500	17,111
Net income available to common equity	171,456	354,622	333,883
Parent Company Only
Income
Income from subsidiaries	192,559	373,581	361,198
Interest income on notes receivable from subsidiaries	30,363	5,632	3,247
Other income	1,175	1,262	682
Total revenue	224,097	380,475	365,127
Expense
Interest expense on short and long-term funding	36,081	10,655	10,942
Other expense	7,352	6,118	7,330
Total expense	43,434	16,772	18,272
Income before income tax expense	180,663	363,702	346,856
Income tax expense	(2,292)	(2,420)	(4,138)
Net income	182,956	366,122	350,994
Preferred stock dividends	11,500	11,500	17,111
Net income available to common equity	$ 171,456	$ 354,622	$ 333,883