Parent Company Information - Components of Condensed Cash Flow The Parent Company (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Operating activities:
Net income	$ 644,283	$ 408,864	$ 220,621
Adjustments to reconcile net income to net cash provided by operating activities:
Common stock contribution to charitable foundation	10,500	0	0
Net cash provided by operating activities	1,335,952	688,592	380,549
Investing activities:
Alternative investments (capital call), net of distributions	(24,887)	(11,361)	(12,244)
Net cash provided by (used in) investing activities	(7,186,338)	(2,405,089)	(2,288,609)
Financing activities:
Dividends paid to common stockholders	(247,767)	(144,807)	(144,965)
Dividends paid to preferred stockholders	(13,725)	(7,875)	(7,875)
Exercise of stock options	703	3,492	240
Common stock repurchase program	(322,103)	0	(76,556)
Common shares acquired related to stock compensation plan activity	23,655	4,384	3,506
Net cash (used in) by financing activities	6,228,759	1,914,963	1,913,269
Net (decrease) increase in cash and cash equivalents	378,373	198,466	5,209
Cash and cash equivalents at beginning of year	461,570	263,104	257,895
Cash and cash equivalents at end of year	839,943	461,570	263,104
Parent Company
Operating activities:
Net income	644,283	408,864	220,621
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(233,191)	(238,254)	(222,528)
Common stock contribution to charitable foundation	10,500	0	0
Other, net	(2,853)	3,562	29,697
Net cash provided by operating activities	418,739	174,172	27,790
Investing activities:
Alternative investments (capital call), net of distributions	(16,292)	(6,304)	(3,751)
Net cash received in business combination	193,238	0	0
Net cash provided by (used in) investing activities	176,946	(6,304)	(3,751)
Financing activities:
Dividends paid to common stockholders	247,767	145,223	144,967
Dividends paid to preferred stockholders	13,725	7,875	7,875
Exercise of stock options	703	3,492	240
Common stock repurchase program	322,103	0	76,556
Common shares acquired related to stock compensation plan activity	(23,655)	(4,384)	(3,506)
Net cash (used in) by financing activities	(606,547)	(153,990)	(232,664)
Net (decrease) increase in cash and cash equivalents	(10,862)	13,878	(208,625)
Cash and cash equivalents at beginning of year	316,193	302,315	510,940
Cash and cash equivalents at end of year	$ 305,331	$ 316,193	$ 302,315