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Regulatory Matters - Schedule of Capital Amounts and Ratios (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Tier 1 capital to average assets
Capital conservation buffer	0.0250	0.0250
Consolidated
Total capital to risk-weighted assets
Actual	$ 610,808	$ 622,444
Actual, ratio	0.1366	0.1422
Minimum for Adequately Capitalized Institutions	$ 357,706	$ 350,113
Minimum for adequately capitalized institutions, ratio	0.0800	0.0800
Tier 1 capital to risk-weighted assets
Actual	$ 554,774	$ 527,616
Actual, ratio	0.1241	0.1206
Minimum for Adequately Capitalized Institutions	$ 268,280	$ 262,585
Minimum for adequately capitalized institutions, ratio	0.0600	0.0600
Common equity tier 1 capital to risk-weighted assets
Actual	$ 516,151	$ 489,044
Actual, ratio	0.1154	0.1117
Minimum for Adequately Capitalized Institutions	$ 201,210	$ 196,939
Minimum for adequately capitalized institutions, ratio	0.0450	0.0450
Tier 1 capital to average assets
Actual	$ 554,774	$ 527,616
Actual, ratio	0.1007	0.0985
Minimum for Adequately Capitalized Institutions	$ 220,377	$ 214,332
Minimum for adequately capitalized institutions, ratio	0.0400	0.0400
Independent Bank
Total capital to risk-weighted assets
Actual	$ 561,840	$ 567,254
Actual, ratio	0.1258	0.1299
Minimum for Adequately Capitalized Institutions	$ 357,199	$ 349,335
Minimum for adequately capitalized institutions, ratio	0.0800	0.0800
Minimum for Well-Capitalized Institutions	$ 446,499	$ 436,668
Minimum for well-capitalized institutions, ratio	0.1000	0.1000
Tier 1 capital to risk-weighted assets
Actual	$ 505,884	$ 512,546
Actual, ratio	0.1133	0.1174
Minimum for Adequately Capitalized Institutions	$ 267,899	$ 262,001
Minimum for adequately capitalized institutions, ratio	0.0600	0.0600
Minimum for Well-Capitalized Institutions	$ 357,199	$ 349,335
Minimum for well capitalized institutions, ratio	0.0800	0.0800
Common equity tier 1 capital to risk-weighted assets
Actual	$ 505,884	$ 512,546
Actual, ratio	0.1133	0.1174
Minimum for Adequately Capitalized Institutions	$ 200,925	$ 196,501
Minimum for adequately capitalized institutions, ratio	0.0450	0.0450
Minimum for Well-Capitalized Institutions	$ 290,224	$ 283,834
Minimum for well-capitalized institutions, ratio	0.0650	0.0650
Tier 1 capital to average assets
Actual	$ 505,884	$ 512,546
Actual, ratio	0.0919	0.0958
Minimum for Adequately Capitalized Institutions	$ 220,083	$ 214,112
Minimum for adequately capitalized institutions, ratio	0.0400	0.0400
Minimum for Well-Capitalized Institutions	$ 275,104	$ 267,640
Minimum for well capitalized institutions, ratio	0.0500	0.0500

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Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework.

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