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Condensed Financial Statements of Parent Company (Tables) | 12 Months Ended
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Dec. 31, 2023
Condensed Financial Information Disclosure [Abstract] |
Schedule of Condensed Balance Sheets | Condensed Balance Sheets
| December 31,
| 2023 |  | 2022
Assets: |  |  |
Cash | $ | 350,525 |  |  | $ | 311,944 |
Total cash and cash equivalents | 350,525 |  |  | 311,944 |
Investment in subsidiaries | 3,625,951 |  |  | 3,065,114 |
Accrued interest receivable and other assets | 1,233 |  |  | 1,142 |
Total assets | $ | 3,977,709 |  |  | $ | 3,378,200 |
Liabilities: |  |  |
Junior subordinated deferrable interest debentures, net of unamortized issuance costs | $ | 123,127 |  |  | $ | 123,069 |
Subordinated notes, net of unamortized issuance costs | 99,491 |  |  | 99,335 |
Accrued interest payable and other liabilities | 38,644 |  |  | 18,568 |
Total liabilities | 261,262 |  |  | 240,972 |
Shareholders’ Equity | 3,716,447 |  |  | 3,137,228 |
Total liabilities and shareholders’ equity | $ | 3,977,709 |  |  | $ | 3,378,200 |
Schedule of Condensed Statements of Income | Condensed Statements of Income
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Income: |  |  |  |  |
Dividend income paid by Frost Bank | $ | 279,679 |  |  | $ | 51,711 |  |  | $ | 219,386 |
Dividend income paid by non-banks | 255 |  |  | 109 |  |  | 473 |
Interest and other income | 1,929 |  |  | — |  |  | 101 |
Total income | 281,863 |  |  | 51,820 |  |  | 219,960 |
Expenses: |  |  |  |  |
Interest expense | 13,304 |  |  | 8,829 |  |  | 7,141 |
Salaries and employee benefits | 1,668 |  |  | 1,605 |  |  | 1,499 |
Other | 6,653 |  |  | 6,316 |  |  | 5,867 |
Total expenses | 21,625 |  |  | 16,750 |  |  | 14,507 |
Income before income taxes and equity in undistributed earnings of subsidiaries | 260,238 |  |  | 35,070 |  |  | 205,453 |
Income tax benefit | 5,974 |  |  | 5,641 |  |  | 4,899 |
Equity in undistributed earnings of subsidiaries | 331,761 |  |  | 538,439 |  |  | 232,727 |
Net income | 597,973 |  |  | 579,150 |  |  | 443,079 |
Preferred stock dividends | 6,675 |  |  | 6,675 |  |  | 7,157 |
Net income available to common shareholders | $ | 591,298 |  |  | $ | 572,475 |  |  | $ | 435,922 |
Schedule of Condensed Statements of Cash Flows | Condensed Statements of Cash Flows
| Year Ended December 31,
| 2023 |  | 2022 |  | 2021
Operating Activities: |  |  |  |  |
Net income | $ | 597,973 |  |  | $ | 579,150 |  |  | $ | 443,079 |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |  |  |
Equity in undistributed earnings of subsidiaries | (331,761) |  |  | (538,439) |  |  | (232,727) |
Stock-based compensation | 880 |  |  | 720 |  |  | 700 |
Net tax benefit from stock-based compensation | 331 |  |  | 472 |  |  | 278 |
Net change in other assets and other liabilities | 19,867 |  |  | (15,249) |  |  | 23,890 |
Net cash from operating activities | 287,290 |  |  | 26,654 |  |  | 235,220 |
Investing Activities: |  |  |  |  |
Redemption of investment in non-bank subsidiary | — |  |  | — |  |  | 406 |
Net cash from investing activities | — |  |  | — |  |  | 406 |
Financing Activities: |  |  |  |  |
Principal payments on long-term borrowings | — |  |  | — |  |  | (13,403) |
Proceeds from stock option exercises | 9,299 |  |  | 16,659 |  |  | 54,417 |
Proceeds from stock-based compensation activities of subsidiaries | 23,710 |  |  | 17,602 |  |  | 12,053 |
Purchase of treasury stock | (42,720) |  |  | (4,391) |  |  | (3,864) |
Treasury stock issued to 401(k) stock purchase plan | — |  |  | — |  |  | 1,749 |
Cash dividends paid on preferred stock | (6,675) |  |  | (6,675) |  |  | (7,157) |
Cash dividends paid on common stock | (232,323) |  |  | (209,780) |  |  | (188,786) |
Net cash from financing activities | (248,709) |  |  | (186,585) |  |  | (144,991) |
Net change in cash and cash equivalents | 38,581 |  |  | (159,931) |  |  | 90,635 |
Cash and cash equivalents at beginning of year | 311,944 |  |  | 471,875 |  |  | 381,240 |
Cash and cash equivalents at end of year | $ | 350,525 |  |  | $ | 311,944 |  |  | $ | 471,875 |

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