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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | $ 616,325 | $ 435,071 | $ 500,685
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Other gains, net | 67,446 | 15,949 | 583
Change in other assets | (12,568) | 1,739 | 18,955
Change in other liabilities | 12,897 | 8,895 | 92,463
Net cash provided by operating activities | (3,692,577) | (416,256) | (473,679)
Cash Flows From Investing Activities: [Abstract] |  |  |
Net cash used in investing activities | 2,602,672 | (2,458,835) | (2,323,737)
Cash Flows From Financing Activities: [Abstract] |  |  |
Repayment of subordinated debentures | 150,000 | 0 | 0
Issuance of common and treasury stock, net | (4,874) | (4,933) | (7)
Dividends paid | (144,105) | (144,437) | (143,496)
Repurchase of common stock | (117,938) | (75,830) | (129,483)
Net cash used in financing activities | 2,746,742 | 2,796,843 | 2,912,813
Net increase (decrease) in cash and cash equivalents | 1,656,837 | (78,248) | 115,397
Cash and cash equivalents at beginning of period | 1,180,573 | 1,258,821 | 1,143,424
Cash and cash equivalents at end of period | 2,837,410 | 1,180,573 | 1,258,821
Cash paid for interest | 68,775 | 160,288 | 417,070
Parent Company [Member] |  |  |
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | 618,121 | 435,030 | 500,758
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Equity in undistributed income of bank subsidiaries | (126,380) | (276,217) | (166,797)
Equity in undistributed income of non-bank subsidiaries | (11,738) | 35,610 | 10,768
Other gains, net | 3,415 | (1,465) | (3,310)
Change in other assets | (1,160) | (15,225) | 1,765
Change in other liabilities | 389 | 850 | 855
Net cash provided by operating activities | 484,967 | 209,033 | 340,509
Cash Flows From Investing Activities: [Abstract] |  |  |
Investment in subsidiaries | (25,665) | (14,807) | (19,837)
Dissolution of subsidiaries | 4,457 | 0 | 0
Net cash used in investing activities | (21,208) | (14,807) | (19,837)
Cash Flows From Financing Activities: [Abstract] |  |  |
Repayment of subordinated debentures | (150,000) | 0 | 0
Issuance of common and treasury stock, net | (4,874) | (4,933) | (7)
Dividends paid | (144,105) | (144,437) | (143,496)
Repurchase of common stock | (117,938) | (75,830) | (129,483)
Net cash used in financing activities | (416,917) | (225,200) | (272,986)
Net increase (decrease) in cash and cash equivalents | 46,842 | (30,974) | 47,686
Cash and cash equivalents at beginning of period | 183,805 | 214,779 | 167,093
Cash and cash equivalents at end of period | 230,647 | 183,805 | 214,779
Cash paid for interest | $ 10,559 | $ 14,064 | $ 15,099

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