Parent Company Only Financial Information, Statement of Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Income
Interest income on notes receivable from subsidiaries	$ 992,642	$ 693,729	$ 785,241
Total revenue	1,239,691	1,058,219	1,277,012
Expense
Income before income tax expense	459,630	436,307	326,972
Income tax expense	93,508	85,313	20,200
Net income	366,122	350,994	306,771
Preferred stock dividends	11,500	17,111	18,358
Net income available to common equity	354,622	333,883	288,413
Parent Company Only
Income
Income from subsidiaries	373,581	361,198	317,895
Interest income on notes receivable from subsidiaries	5,632	3,247	3,257
Other income	1,262	682	933
Total revenue	380,475	365,127	322,084
Expense
Interest expense on short and long-term funding	10,655	10,942	10,960
Other expense	6,118	7,330	6,422
Total expense	16,772	18,272	17,383
Income before income tax expense	363,702	346,856	304,702
Income tax expense	(2,420)	(4,138)	(2,070)
Net income	366,122	350,994	306,771
Preferred stock dividends	11,500	17,111	18,358
Net income available to common equity	$ 354,622	$ 333,883	$ 288,413