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Regulatory Matters - Schedule of Regulatory Capital (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | --- | --- | --- | --- | ---
Components of regulatory capital [Abstract] |  |  |  |  |  |
Total shareholders' equity | $ 490,742 | $ 469,250 | $ 454,686 | $ 452,369 | $ 430,459 | $ 404,449
Add (deduct) |  |  |  |  |  |
Accumulated other comprehensive loss for regulatory purposes | (60,630) |  | (69,944) |  |  |
Subordinated debt | 0 |  | 39,586 |  |  |
Consolidated |  |  |  |  |  |
Components of regulatory capital [Abstract] |  |  |  |  |  |
Total shareholders' equity | 490,742 |  | 454,686 |  |  |
Add (deduct) |  |  |  |  |  |
Accumulated other comprehensive loss for regulatory purposes | 54,832 |  | 64,146 |  |  |
Goodwill and other intangibles | (29,423) |  | (29,788) |  |  |
Common equity tier 1 capital | 516,151 |  | 489,044 |  |  |
Qualifying trust preferred securities | 38,623 |  | 38,572 |  |  |
Tier 1 capital | 554,774 |  | 527,616 |  |  |
Subordinated debt | 0 |  | 40,000 |  |  |
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets | 56,034 |  | 54,828 |  |  |
Total risk-based capital | 610,808 |  | 622,444 |  |  |
Independent Bank |  |  |  |  |  |
Components of regulatory capital [Abstract] |  |  |  |  |  |
Total shareholders' equity | 480,475 |  | 478,188 |  |  |
Add (deduct) |  |  |  |  |  |
Accumulated other comprehensive loss for regulatory purposes | 54,832 |  | 64,146 |  |  |
Goodwill and other intangibles | (29,423) |  | (29,788) |  |  |
Common equity tier 1 capital | 505,884 |  | 512,546 |  |  |
Qualifying trust preferred securities | 0 |  | 0 |  |  |
Tier 1 capital | 505,884 |  | 512,546 |  |  |
Subordinated debt | 0 |  | 0 |  |  |
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets | 55,956 |  | 54,708 |  |  |
Total risk-based capital | $ 561,840 |  | $ 567,254 |  |  |

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