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Parent Company Only Financial Statements Parent Company Only Financial Statements, Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | $ 435,071 | $ 500,685 | $ 446,424
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Change in other assets | 1,739 | 18,955 | 27,507
Change in other liabilities | 8,895 | 92,463 | (144,537)
Net cash provided by operating activities | (416,256) | (473,679) | (552,006)
Cash Flows From Investing Activities: [Abstract] |  |  |
Acquisitions, net of cash acquired | 0 | 0 | (175,755)
Net cash used in investing activities | (2,458,835) | (2,323,737) | (1,807,631)
Cash Flows From Financing Activities: [Abstract] |  |  |
Issuance of common and treasury stock, net | (4,933) | (7) | (88)
Dividends paid | (144,437) | (143,496) | (127,188)
Repurchase of common stock | (75,830) | (129,483) | (53,465)
Net cash used in financing activities | 2,796,843 | 2,912,813 | 1,186,007
Net increase (decrease) in cash and cash equivalents | (78,248) | 115,397 | (1,173,630)
Cash and cash equivalents at beginning of period | 1,258,821 | 1,143,424 | 2,317,054
Cash and cash equivalents at end of period | 1,180,573 | 1,258,821 | 1,143,424
Cash paid for interest | 160,288 | 417,070 | 243,121
Parent Company [Member] |  |  |
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | 435,030 | 500,758 | 445,646
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Equity in undistributed income of bank subsidiaries | (276,217) | (166,797) | (37,515)
Equity in undistributed income of non-bank subsidiaries | 35,610 | 10,768 | 12,914
Change in other assets | (13,760) | 5,075 | 1,072
Change in other liabilities | 850 | 855 | (13,434)
Net cash provided by operating activities | 209,033 | 340,509 | 406,539
Cash Flows From Investing Activities: [Abstract] |  |  |
Investment in subsidiaries | (14,807) | (19,837) | (31,901)
Acquisitions, net of cash acquired | 0 | 0 | (232,680)
Net cash used in investing activities | (14,807) | (19,837) | (264,581)
Cash Flows From Financing Activities: [Abstract] |  |  |
Issuance of common and treasury stock, net | (4,933) | (7) | (88)
Dividends paid | 144,437 | 143,496 | 127,188
Repurchase of common stock | 75,830 | 129,483 | 53,465
Net cash used in financing activities | (225,200) | (272,986) | (180,741)
Net increase (decrease) in cash and cash equivalents | (30,974) | 47,686 | (38,783)
Cash and cash equivalents at beginning of period | 214,779 | 167,093 | 205,876
Cash and cash equivalents at end of period | 183,805 | 214,779 | 167,093
Cash paid for interest | $ 14,064 | $ 15,099 | $ 11,457

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