Parent Company Information - Schedule of Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Cash flows from operating activities:
Net Income	$ 380,271	$ 498,511	$ 568,851
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	28,988	33,102	28,788
Net amortization of premiums and accretion of discounts on borrowings	(3,399)	(2,145)	10,653
Debt and Equity Securities, Gain (Loss)	(100)	(1,104)	1,230
Net change in:
Other assets	(263,375)	(173,512)	(229,107)
Accrued expenses and other liabilities	(11,094)	(5,834)	874,880
Net cash provided by operating activities	548,540	378,192	1,428,479
Cash flows from investing activities:
Purchases of equity securities	(9,950)	(14,011)	(11,209)
Cash and cash equivalents acquired in acquisitions, net	0	0	321,540
Net cash used in investing activities	(709,284)	(3,349,502)	(6,787,781)
Cash flows from financing activities:
Proceeds from issuance of long-term borrowings, net	1,001,800	1,251,804	147,508
Repayment of long-term borrowings	(165,000)	(475,000)	0
Proceeds from issuance of preferred stock, net	144,654	0	0
Dividends paid to preferred shareholders	(21,369)	(14,338)	(13,146)
Dividends paid to common shareholders	(228,228)	(225,411)	(205,999)
Purchase of common shares to treasury	(8,867)	(11,475)	(24,123)
Common stock issued, net	451,164	4,006	120
Net cash provided by (used in) financing activities	1,159,644	2,914,588	4,257,329
Net change in cash and cash equivalents	998,900	(56,722)	(1,101,973)
Cash and cash equivalents at beginning of year	891,225	947,947	2,049,920
Cash and cash equivalents at end of year	1,890,125	891,225	947,947
Parent Company
Cash flows from operating activities:
Net Income	380,271	498,511	568,851
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(73,622)	(111,856)	(184,911)
Stock-based compensation	28,988	33,104	28,788
Net amortization of premiums and accretion of discounts on borrowings	1,947	2,058	1,741
Debt and Equity Securities, Gain (Loss)	1,581	(1,036)	1,136
Net change in:
Other assets	4,167	13,472	(9,206)
Accrued expenses and other liabilities	(37,661)	(8,501)	5,851
Net cash provided by operating activities	305,671	425,752	412,250
Cash flows from investing activities:
Purchases of equity securities	(9,253)	(11,261)	(10,424)
Cash and cash equivalents acquired in acquisitions, net	0	0	(113,244)
Capital contributions to subsidiary	(550,000)	(20)	(125,055)
Other, net	52	5,098	0
Net cash used in investing activities	(559,201)	(6,183)	(248,723)
Cash flows from financing activities:
Proceeds from issuance of long-term borrowings, net	0	0	147,508
Repayment of long-term borrowings	0	(125,000)	0
Proceeds from issuance of preferred stock, net	144,654	0	0
Dividends paid to preferred shareholders	(21,369)	(14,338)	(13,146)
Dividends paid to common shareholders	(228,228)	(225,411)	(205,999)
Purchase of common shares to treasury	(8,867)	(11,475)	(24,123)
Common stock issued, net	451,164	4,006	120
Net cash provided by (used in) financing activities	337,354	(372,218)	(95,640)
Net change in cash and cash equivalents	83,824	47,351	67,887
Cash and cash equivalents at beginning of year	193,248	145,897	78,010
Cash and cash equivalents at end of year	$ 277,072	$ 193,248	$ 145,897