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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 |  |

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