Parent Company Information - Schedule of Condensed Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net Income	$ 568,851	$ 473,840	$ 390,606
Adjustments to reconcile net income to net cash provided by operating activities:
Stock-based compensation	28,788	20,887	16,154
Net amortization of premiums and accretion of discounts on borrowings	10,653	30,251	38,315
Net change in:
Other assets	(259,690)	122,241	(311,760)
Accrued expenses and other liabilities	874,880	(63,653)	58,234
Net cash provided by operating activities	1,428,479	837,142	163,561
Cash flows from investing activities:
Purchases of equity securities	(11,209)	(4,051)	(8,337)
Cash and cash equivalents acquired in acquisitions, net	321,540	321,618	0
Net cash used in investing activities	(6,787,781)	(1,080,781)	(2,037,662)
Cash flows from financing activities:
Proceeds from issuance of long-term borrowings, net	147,508	295,922	838,388
Repayment of long-term borrowings	0	(1,168,465)	(679,775)
Dividends paid to preferred shareholders	(13,146)	(12,688)	(12,688)
Dividends paid to common shareholders	(205,999)	(179,667)	(177,965)
Purchase of common shares to treasury	(24,123)	(23,907)	(5,374)
Common stock issued, net	120	11,245	2,202
Net cash (used in) provided by financing activities	4,257,329	964,354	2,768,619
Net change in cash and cash equivalents	(1,101,973)	720,715	894,518
Cash and cash equivalents at beginning of year	2,049,920	1,329,205	434,687
Cash and cash equivalents at end of year	947,947	2,049,920	1,329,205
Parent Company
Cash flows from operating activities:
Net Income	568,851	473,840	390,606
Adjustments to reconcile net income to net cash provided by operating activities:
Equity in undistributed earnings of subsidiaries	(184,911)	(341,365)	(219,687)
Stock-based compensation	28,788	20,887	16,154
Net amortization of premiums and accretion of discounts on borrowings	1,741	1,152	230
Net change in:
Other assets	(8,070)	2,134	121
Accrued expenses and other liabilities	5,851	(7,079)	17,905
Net cash provided by operating activities	412,250	149,569	205,329
Cash flows from investing activities:
Purchases of equity securities	(10,424)	(1,644)	(2,500)
Cash and cash equivalents acquired in acquisitions, net	(113,244)	(3,983)	0
Repayment of subordinated debt by subsidiary	0	0	100,000
Capital contributions to subsidiary	(125,055)	(227,000)	(210,000)
Other, net	0	0	(1,200)
Net cash used in investing activities	(248,723)	(232,627)	(113,700)
Cash flows from financing activities:
Proceeds from issuance of long-term borrowings, net	147,508	295,922	113,146
Repayment of long-term borrowings	0	(60,000)	0
Dividends paid to preferred shareholders	(13,146)	(12,688)	(12,688)
Dividends paid to common shareholders	(205,999)	(179,667)	(177,965)
Purchase of common shares to treasury	(24,123)	(23,907)	(5,374)
Common stock issued, net	120	11,245	2,202
Net cash (used in) provided by financing activities	(95,640)	30,905	(80,679)
Net change in cash and cash equivalents	67,887	(52,153)	10,950
Cash and cash equivalents at beginning of year	78,010	130,163	119,213
Cash and cash equivalents at end of year	$ 145,897	$ 78,010	$ 130,163