Parent Company Information - Components of Condensed Cash Flow The Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities:
Net income	$ 867,840	$ 644,283	$ 408,864
Adjustments to reconcile net income to net cash provided by operating activities:
Common stock contribution to charitable foundation	0	10,500	0
Net cash provided by operating activities	978,649	1,335,952	688,592
Investing activities:
Alternative investments (capital call), net of distributions	(27,430)	(24,887)	(11,361)
Net cash (used in) provided by investing activities	(2,595,752)	(7,186,338)	(2,405,089)
Financing activities:
Dividends paid to common stockholders	(278,155)	(247,767)	(144,807)
Dividends paid to preferred stockholders	(16,650)	(13,725)	(7,875)
Exercise of stock options	1,723	703	3,492
Common stock repurchase program	(107,984)	(322,103)	0
Common shares acquired related to stock compensation plan activity	16,278	23,655	4,384
Net cash (used in) financing activities	2,492,955	6,228,759	1,914,963
Net increase (decrease) in cash and cash equivalents	875,852	378,373	198,466
Cash and cash equivalents, beginning of period	839,943	461,570	263,104
Cash and cash equivalents, at end of period	1,715,795	839,943	461,570
Parent Company
Operating activities:
Net income	867,840	644,283	408,864
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(310,939)	(233,191)	(238,254)
Common stock contribution to charitable foundation	0	10,500	0
Other, net	(8,312)	(2,853)	3,562
Net cash provided by operating activities	548,589	418,739	174,172
Investing activities:
Alternative investments (capital call), net of distributions	(13,070)	(16,292)	(6,304)
Net cash received in business combination	0	193,238	0
Net cash (used in) provided by investing activities	(13,070)	176,946	(6,304)
Financing activities:
Repayment of long-term debt	(16,752)	0	0
Dividends paid to common stockholders	278,155	247,767	145,223
Dividends paid to preferred stockholders	16,650	13,725	7,875
Exercise of stock options	1,723	703	3,492
Common stock repurchase program	107,984	322,103	0
Common shares acquired related to stock compensation plan activity	(16,278)	(23,655)	(4,384)
Net cash (used in) financing activities	(434,096)	(606,547)	(153,990)
Net increase (decrease) in cash and cash equivalents	101,423	(10,862)	13,878
Cash and cash equivalents, beginning of period	305,331	316,193	302,315
Cash and cash equivalents, at end of period	$ 406,754	$ 305,331	$ 316,193