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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | $ 531,133 | $ 520,293 | $ 616,325
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Other gains, net | 26,162 | (846) | 67,446
Change in other assets | 89,930 | 13,205 | (12,568)
Change in other liabilities | (79,733) | 50,836 | 12,897
Net cash provided by operating activities | 66,183 | 5,122,270 | (3,692,577)
Cash Flows From Investing Activities: [Abstract] |  |  |
Sale of subsidiary | 32,601 | 0 | 0
Net cash provided by (used in) investing activities | (1,791,264) | (4,603,286) | 2,602,672
Cash Flows From Financing Activities: [Abstract] |  |  |
Repayment of subordinated debentures | 0 | 0 | 150,000
Issuance of common and treasury stock, net | (4,941) | (4,907) | (4,874)
Dividends paid | (143,398) | (143,800) | (144,105)
Repurchase of common stock | (176,819) | (154,887) | (117,938)
Net cash used in financing activities | 1,671,630 | (1,954,678) | 2,746,742
Net increase (decrease) in cash and cash equivalents | (53,451) | (1,435,694) | 1,656,837
Cash and cash equivalents at beginning of period | 1,401,716 | 2,837,410 | 1,180,573
Cash and cash equivalents at end of period | 1,348,265 | 1,401,716 | 2,837,410
Cash paid for interest | 1,044,950 | 176,081 | 68,775
Parent Company [Member] |  |  |
Cash Flows From Operating Activities: [Abstract] |  |  |
Net income | 530,746 | 520,273 | 618,121
Adjustments to reconcile net income to net cash provided by operating activities: [Abstract] |  |  |
Equity in undistributed income of bank subsidiaries | (181,487) | (300,330) | (126,380)
Equity in undistributed income of non-bank subsidiaries | 1,952 | 41,201 | (11,738)
Other gains, net | (32,656) | 4,279 | 3,415
Change in other assets | (1,986) | (1,317) | (1,160)
Change in other liabilities | 13,404 | 543 | 389
Net cash provided by operating activities | 333,945 | 267,283 | 484,967
Cash Flows From Investing Activities: [Abstract] |  |  |
Investment in subsidiaries | (2,975) | (31,552) | (25,665)
Sale of subsidiary | (32,601) | 0 | 0
Dissolution of subsidiaries | 0 | 2,611 | 4,457
Net cash provided by (used in) investing activities | 29,626 | (28,941) | (21,208)
Cash Flows From Financing Activities: [Abstract] |  |  |
Repayment of subordinated debentures | 0 | 0 | (150,000)
Issuance of common and treasury stock, net | (4,941) | (4,907) | (4,874)
Dividends paid | (143,398) | (143,800) | (144,105)
Repurchase of common stock | (176,819) | (154,887) | (117,938)
Net cash used in financing activities | (325,158) | (303,594) | (416,917)
Net increase (decrease) in cash and cash equivalents | 38,413 | (65,252) | 46,842
Cash and cash equivalents at beginning of period | 165,395 | 230,647 | 183,805
Cash and cash equivalents at end of period | 203,808 | 165,395 | 230,647
Cash paid for interest | $ 8,479 | $ 6,203 | $ 10,559

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