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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, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | $ 520,293 | $ 616,325 | $ 435,071
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Other gains, net | (846) | 67,446 | 15,949
Change in other assets | 13,205 | (12,568) | 1,739
Change in other liabilities | 50,836 | 12,897 | 8,895
Net cash provided by operating activities | 5,122,270 | (3,692,577) | (416,256)
Cash Flows From Investing Activities: [Abstract] |  |  |
Net cash used in investing activities | (4,603,286) | 2,602,672 | (2,458,835)
Cash Flows From Financing Activities: [Abstract] |  |  |
Repayment of subordinated debentures | 0 | 150,000 | 0
Issuance of common and treasury stock, net | (4,907) | (4,874) | (4,933)
Dividends paid | (143,800) | (144,105) | (144,437)
Repurchase of common stock | (154,887) | (117,938) | (75,830)
Net cash used in financing activities | (1,954,678) | 2,746,742 | 2,796,843
Net increase (decrease) in cash and cash equivalents | (1,435,694) | 1,656,837 | (78,248)
Cash and cash equivalents at beginning of period | 2,837,410 | 1,180,573 | 1,258,821
Cash and cash equivalents at end of period | 1,401,716 | 2,837,410 | 1,180,573
Cash paid for interest | 176,081 | 68,775 | 160,288
Parent Company [Member] |  |  |
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | 520,273 | 618,121 | 435,030
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Equity in undistributed income of bank subsidiaries | (300,330) | (126,380) | (276,217)
Equity in undistributed income of non-bank subsidiaries | 41,201 | (11,738) | 35,610
Other gains, net | 4,279 | 3,415 | (1,465)
Change in other assets | (1,317) | (1,160) | (15,225)
Change in other liabilities | 543 | 389 | 850
Net cash provided by operating activities | 267,283 | 484,967 | 209,033
Cash Flows From Investing Activities: [Abstract] |  |  |
Investment in subsidiaries | (31,552) | (25,665) | (14,807)
Dissolution of subsidiaries | 2,611 | 4,457 | 0
Net cash used in investing activities | (28,941) | (21,208) | (14,807)
Cash Flows From Financing Activities: [Abstract] |  |  |
Repayment of subordinated debentures | 0 | (150,000) | 0
Issuance of common and treasury stock, net | (4,907) | (4,874) | (4,933)
Dividends paid | (143,800) | (144,105) | (144,437)
Repurchase of common stock | (154,887) | (117,938) | (75,830)
Net cash used in financing activities | (303,594) | (416,917) | (225,200)
Net increase (decrease) in cash and cash equivalents | (65,252) | 46,842 | (30,974)
Cash and cash equivalents at beginning of period | 230,647 | 183,805 | 214,779
Cash and cash equivalents at end of period | 165,395 | 230,647 | 183,805
Cash paid for interest | $ 6,203 | $ 10,559 | $ 14,064

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