Parents Company Financial Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating activities
Net income		$ 232,177	$ 199,759	$ 154,665
Adjustments to reconcile net income to net cash provided by operating activities
Share-based compensation		16,047	10,507	0
ESOP expense		7,129	9,923	9,408
Net cash provided by operating activities		261,692	229,942	174,490
Investing activities
Acquisitions, net of cash and cash equivalents acquired		0	0	(9,085)
Contributions to other equity investments		(720)	(788)	(2,519)
Net cash provided by (used in) investing activities		2,400,265	(1,076,655)	(1,985,744)
Financing activities
Payment of subordinated debentures assumed in business combination	[1]	0	0	(36,277)
Payments for shares repurchased under share repurchase plans		0	(201,618)	(23,224)
Net cash (used in) provided by financing activities		(2,138,386)	(215,574)	988,976
Net increase (decrease) in cash, cash equivalents, and restricted cash		523,571	(1,062,287)	(822,278)
Cash, cash equivalents, and restricted cash at beginning of period		169,505	1,231,792	2,054,070
Cash, cash equivalents, and restricted cash at end of period		693,076	169,505	1,231,792
Parent
Operating activities
Net income		232,177	199,759	154,665
Adjustments to reconcile net income to net cash provided by operating activities
Equity in undistributed income of subsidiaries		(238,917)	(203,982)	(150,936)
Share-based compensation		16,513	10,507	0
ESOP expense		7,129	9,923	9,408
Deferred income taxes, net		6,419	4,792	(7,157)
Other, net		(4,115)	(937)	(388)
Net cash provided by operating activities		19,206	20,062	5,592
Investing activities
Acquisitions, net of cash and cash equivalents acquired		0	0	(640,890)
Return of investments in subsidiary		40,000	240,000	140,000
Contributions to other equity investments		(720)	(788)	0
Net cash provided by (used in) investing activities		39,280	239,212	(500,890)
Financing activities
Payment of subordinated debentures assumed in business combination		0	0	(36,277)
Payments for shares repurchased under share repurchase plans		0	(201,618)	(23,224)
Dividends declared and paid to common shareholders		(66,671)	(65,886)	(51,564)
Net cash (used in) provided by financing activities		(66,671)	(267,504)	(111,065)
Net increase (decrease) in cash, cash equivalents, and restricted cash		(8,185)	(8,230)	(606,363)
Cash, cash equivalents, and restricted cash at beginning of period		126,441	134,671	741,034
Cash, cash equivalents, and restricted cash at end of period		$ 118,256	$ 126,441	$ 134,671

[1] (1)The Company deposited funds into escrow prior to the Century acquisition date to pay the balance of subordinated debentures assumed in the Century acquisition which was considered to be a defeasance of the debt. Accordingly, Century recorded a payable to the Company in the amount of the escrow deposit and the Company recorded a receivable from Century in the same amount. The payable was reclassified to other assets upon acquisition and is reflected as such balance in the summary of net assets acquired. Subsequent to the closing of the acquisition and prior to December 31, 2021, the amounts placed in escrow were disbursed to the holders of the subordinated debentures resulting in a full pay-off of the outstanding balance of the debt.