Parent Company Condensed Financial Statements (Condensed Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
ASSETS
Cash and cash equivalents due from subsidiary bank	$ 3,912,935	$ 4,017,971
Other assets	1,382,253	1,324,262
TOTAL	60,870,701	52,156,913	$ 44,196,096
LIABILITIES
Total liabilities	55,033,483	46,887,738
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 167,790,645 and 167,240,600 shares issued in 2021 and 2020, respectively	168	167
Additional paid-in capital	1,893,557	1,858,352
Retained earnings	4,683,659	4,000,414
Treasury stock, at cost 25,882,691 shares in 2021 and 25,675,371 shares in 2020	(649,785)	(634,083)
AOCI, net of tax	(90,381)	44,325
Total stockholders’ equity	5,837,218	5,269,175	$ 5,017,617	$ 4,423,974
TOTAL	60,870,701	52,156,913
Parent Company
ASSETS
Cash and cash equivalents due from subsidiary bank	345,018	439,065
Investments in tax credit and other investments, net	4,082	6,586
Other assets	9,407	3,072
TOTAL	5,994,618	5,504,357
LIABILITIES
Long-term debt	147,658	147,376
Accrued income tax payable	0	81,741
Other liabilities	9,742	6,065
Total liabilities	157,400	235,182
STOCKHOLDERS’ EQUITY
Common stock, $0.001 par value, 200,000,000 shares authorized; 167,790,645 and 167,240,600 shares issued in 2021 and 2020, respectively	168	167
Additional paid-in capital	1,893,557	1,858,352
Retained earnings	4,683,659	4,000,414
Treasury stock, at cost 25,882,691 shares in 2021 and 25,675,371 shares in 2020	(649,785)	(634,083)
AOCI, net of tax	(90,381)	44,325
Total stockholders’ equity	5,837,218	5,269,175
TOTAL	5,994,618	5,504,357
Parent Company | Bank
ASSETS
Investments in Subsidiaries	5,626,975	5,048,896
Parent Company | Nonbank
ASSETS
Investments in Subsidiaries	$ 9,136	$ 6,738