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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
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | $ 500,685 | $ 446,424 | $ 335,685
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Change in other assets | 18,955 | 27,507 | (5,506)
Change in other liabilities | 57,569 | (139,346) | 182,184
Net cash provided by operating activities | (473,679) | (552,006) | 214,931
Cash Flows From Investing Activities: [Abstract] |  |  |
Proceeds from sales of available for sale securities | 1,211,718 | 745,643 | 1,309,215
Acquisitions, net of cash acquired | 0 | (175,755) | 0
Net cash used in investing activities | (2,323,737) | (1,807,631) | 739,556
Cash Flows From Financing Activities: [Abstract] |  |  |
Net change in other borrowed funds | 1,110,970 | 1,295,484 | (10,909)
Issuance of common and treasury stock, net | (7) | (88) | 4,368
Dividends paid | (143,496) | (127,188) | (116,041)
Repurchase of common stock | (129,483) | (53,465) | (7,403)
Net cash used in financing activities | 2,912,813 | 1,186,007 | (1,174,930)
Net increase (decrease) in cash and cash equivalents | 115,397 | (1,173,630) | (220,443)
Cash and cash equivalents at beginning of period | 1,143,424 | 2,317,054 | 2,537,497
Cash and cash equivalents at end of period | 1,258,821 | 1,143,424 | 2,317,054
Cash paid for interest | 417,070 | 243,121 | 127,513
Parent Company [Member] |  |  |
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | 500,758 | 445,646 | 334,644
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Equity in undistributed income of bank subsidiaries | (166,797) | (37,515) | (181,552)
Equity in undistributed income of non-bank subsidiaries | (10,768) | (12,914) | (9,545)
Change in other assets | 5,075 | 1,072 | (12)
Change in other liabilities | 855 | (13,434) | 7,457
Net cash provided by operating activities | 340,509 | 406,539 | 170,106
Cash Flows From Investing Activities: [Abstract] |  |  |
Proceeds from sales of available for sale securities | 0 | 0 | 3,000
Investment in subsidiaries | (19,837) | (31,901) | (4,355)
Acquisitions, net of cash acquired | 0 | (232,680) | 0
Net cash used in investing activities | (19,837) | (264,581) | (1,355)
Cash Flows From Financing Activities: [Abstract] |  |  |
Net change in other borrowed funds | 0 | 0 | (7,217)
Issuance of common and treasury stock, net | (7) | (88) | 4,368
Dividends paid | 143,496 | 127,188 | 116,041
Repurchase of common stock | 129,483 | 53,465 | 7,403
Net cash used in financing activities | (272,986) | (180,741) | (126,293)
Net increase (decrease) in cash and cash equivalents | 47,686 | (38,783) | 42,458
Cash and cash equivalents at beginning of period | 167,093 | 205,876 | 163,418
Cash and cash equivalents at end of period | 214,779 | 167,093 | 205,876
Cash paid for interest | $ 15,099 | $ 11,457 | $ 6,211

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