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Regulatory Matters - Schedule of Capital Amounts and Ratios (Details) $ in Thousands	Mar. 31, 2026 USD ($)	Dec. 31, 2025 USD ($)
Tier 1 capital to average assets
Capital conservation buffer	0.0250	0.0250
Consolidated
Total capital to risk-weighted assets
Actual	$ 632,742	$ 621,506
Actual, ratio	0.1379	0.1359
Minimum for Adequately Capitalized Institutions	$ 367,024	$ 365,958
Minimum for adequately capitalized institutions, ratio	0.0800	0.0800
Tier 1 capital to risk-weighted assets
Actual	$ 575,250	$ 564,180
Actual, ratio	0.1254	0.1233
Minimum for Adequately Capitalized Institutions	$ 275,268	$ 274,468
Minimum for adequately capitalized institutions, ratio	0.0600	0.0600
Common equity tier 1 capital to risk-weighted assets
Actual	$ 536,593	$ 525,540
Actual, ratio	0.1170	0.1149
Minimum for Adequately Capitalized Institutions	$ 206,451	$ 205,851
Minimum for adequately capitalized institutions, ratio	0.0450	0.0450
Tier 1 capital to average assets
Actual	$ 575,250	$ 564,180
Actual, ratio	0.1034	0.1027
Minimum for Adequately Capitalized Institutions	$ 222,477	$ 219,663
Minimum for adequately capitalized institutions, ratio	0.0400	0.0400
Independent Bank
Total capital to risk-weighted assets
Actual	$ 581,090	$ 570,750
Actual, ratio	0.1268	0.1249
Minimum for Adequately Capitalized Institutions	$ 366,515	$ 365,463
Minimum for adequately capitalized institutions, ratio	0.0800	0.0800
Minimum for Well-Capitalized Institutions	$ 458,144	$ 456,829
Minimum for well-capitalized institutions, ratio	0.1000	0.1000
Tier 1 capital to risk-weighted assets
Actual	$ 523,676	$ 513,500
Actual, ratio	0.1143	0.1124
Minimum for Adequately Capitalized Institutions	$ 274,886	$ 274,098
Minimum for adequately capitalized institutions, ratio	0.0600	0.0600
Minimum for Well-Capitalized Institutions	$ 366,515	$ 365,463
Minimum for well capitalized institutions, ratio	0.0800	0.0800
Common equity tier 1 capital to risk-weighted assets
Actual	$ 523,676	$ 513,500
Actual, ratio	0.1143	0.1124
Minimum for Adequately Capitalized Institutions	$ 206,165	$ 205,573
Minimum for adequately capitalized institutions, ratio	0.0450	0.0450
Minimum for Well-Capitalized Institutions	$ 297,793	$ 296,939
Minimum for well-capitalized institutions, ratio	0.0650	0.0650
Tier 1 capital to average assets
Actual	$ 523,676	$ 513,500
Actual, ratio	0.0943	0.0936
Minimum for Adequately Capitalized Institutions	$ 222,243	$ 219,422
Minimum for adequately capitalized institutions, ratio	0.0400	0.0400
Minimum for Well-Capitalized Institutions	$ 277,803	$ 274,278
Minimum for well capitalized institutions, ratio	0.0500	0.0500

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