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Allowance for loan losses and allowance for unfunded lending commitments included in total risk-based capital.

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Components of regulatory capital [Abstract]

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Trust preferred securities qualifying as Tier 1 capital.

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Amount, after tax, of accumulated increase (decrease) in equity from transaction and other event and circumstance from nonowner source.

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Amount of total capital as defined by regulatory framework.

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Amount of Common Equity Tier 1 risk-based capital as defined by regulatory framework.

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Amount, after impairment and amortization, of goodwill, indefinite-lived, and finite-lived intangible assets.

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Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.

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Regulatory Matters - Components of Regulatory Capital (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023
Components of regulatory capital [Abstract]
Total shareholders' equity	$ 469,250	$ 467,277	$ 454,686	$ 430,459	$ 415,570	$ 404,449
Add (deduct)
Accumulated other comprehensive loss	(69,887)		(69,944)
Subordinated debt	39,624		39,586
Consolidated
Components of regulatory capital [Abstract]
Total shareholders' equity	469,250		454,686
Add (deduct)
Accumulated other comprehensive loss	64,089		64,146
Goodwill and other intangibles	(29,544)		(29,788)
Common equity tier 1 capital	503,795		489,044
Qualifying trust preferred securities	38,606		38,572
Tier 1 capital	542,401		527,616
Subordinated debt	32,000		40,000
Allowance for credit losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	55,571		54,828
Total risk-based capital	629,972		622,444
Independent Bank
Components of regulatory capital [Abstract]
Total shareholders' equity	492,417		478,188
Add (deduct)
Accumulated other comprehensive loss	64,089		64,146
Goodwill and other intangibles	(29,544)		(29,788)
Common equity tier 1 capital	526,962		512,546
Qualifying trust preferred securities	0		0
Tier 1 capital	526,962		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	55,479		54,708
Total risk-based capital	$ 582,441		$ 567,254