Condensed Parent Company Financial Statements - Schedule of Statements of Cash Flows (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Operating Activities:
Net income	$ 622,626	$ 509,682	$ 466,151
Adjustments to reconcile net income to net cash provided by operating activities
Losses (gains) on available-for-sale debt securities and equity securities with readily determinable fair value, net	(1,525)	20,427	1,059
Depreciation and amortization	84,764	82,070	101,797
Deferred income tax (benefit) expense	(19,707)	22,057	(2,861)
Stock-based compensation expense	33,495	31,748	16,177
(Increase) decrease in other assets	(205,428)	(91,585)	187,743
(Decrease) increase in other liabilities	164,606	377,396	78,475
Net Cash Provided by Operating Activities	744,376	1,375,000	1,130,872
Investing Activities:
Net Cash Used for Investing Activities	(3,237,816)	(3,490,769)	(5,928,859)
Financing Activities:
(Decrease) increase in subordinated notes, other borrowings and junior subordinated debentures, net	40,670	125,135	(27,784)
Proceeds from common stock offering, net	0	285,729	0
Issuance of common shares resulting from exercise of stock options and employee stock purchase plan	8,309	11,233	19,824
Dividends paid	(125,690)	(108,210)	(98,629)
Common stock repurchases under authorized program	0	0	(9,540)
Common stock repurchases for tax withholdings related to stock-based compensation	(1,913)	(304)	0
Net Cash Provided by Financing Activities	2,425,938	2,195,530	4,886,718
Net (Decrease) Increase in Cash and Cash Equivalents	(67,502)	79,761	88,731
Cash and Cash Equivalents at Beginning of Period	490,966	411,205	322,474
Cash and Cash Equivalents at End of Period	423,464	490,966	411,205
Reportable Legal Entities | Parent Company
Operating Activities:
Net income	622,626	509,682	466,151
Adjustments to reconcile net income to net cash provided by operating activities
Losses (gains) on available-for-sale debt securities and equity securities with readily determinable fair value, net	(442)	7,018	(1,794)
Depreciation and amortization	25,840	27,642	28,783
Deferred income tax (benefit) expense	(6,176)	(2,773)	(5,350)
Stock-based compensation expense	14,154	13,632	6,769
(Increase) decrease in other assets	(3,978)	(7,116)	6,598
(Decrease) increase in other liabilities	(6,059)	(6,107)	1,225
Equity in undistributed net income of subsidiaries	(473,735)	(662,742)	(482,336)
Net Cash Provided by Operating Activities	172,230	(120,764)	20,046
Investing Activities:
Capital contributions to subsidiaries, net	0	(69,000)	(27,000)
Other investing activity, net	(25,965)	(30,872)	(22,877)
Net Cash Used for Investing Activities	(25,965)	(99,872)	(49,877)
Financing Activities:
(Decrease) increase in subordinated notes, other borrowings and junior subordinated debentures, net	(30,641)	117,381	(23,274)
Proceeds from common stock offering, net	0	285,729	0
Issuance of common shares resulting from exercise of stock options and employee stock purchase plan	8,309	11,233	19,824
Dividends paid	(125,690)	(108,210)	(98,629)
Common stock repurchases under authorized program	0	0	(9,540)
Common stock repurchases for tax withholdings related to stock-based compensation	(1,913)	(304)	0
Net Cash Provided by Financing Activities	(149,935)	305,829	(111,619)
Net (Decrease) Increase in Cash and Cash Equivalents	(3,670)	85,193	(141,450)
Cash and Cash Equivalents at Beginning of Period	266,350	181,157	322,607
Cash and Cash Equivalents at End of Period	$ 262,680	$ 266,350	$ 181,157