Regulatory Matters (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Dec. 31, 2016
Regulatory Matters [Abstract]
Undivided profits	$ 27,200
Components of regulatory capital [Abstract]
Total shareholders' equity	345,204	$ 264,933	$ 267,710	$ 248,980
Add (deduct) [Abstract]
Accumulated other comprehensive loss for regulatory purposes	(9,889)	(5,999)
Consolidated [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital	$ 373,748	$ 312,163
Actual, Ratio	14.57%	15.16%
Minimum for Adequately Capitalized Institutions, Amount	$ 205,173	$ 164,782
Minimum for Adequately Capitalized Institutions, Ratio	8.00%	8.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount	$ 348,228	$ 288,451
Actual, Ratio	13.58%	14.00%
Minimum for Adequately Capitalized Institutions, Amount	$ 153,880	$ 123,586
Minimum for Adequately Capitalized Institutions, Ratio	6.00%	6.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount	$ 310,081	$ 255,934
Actual, Ratio	12.09%	12.43%
Minimum for Adequately Capitalized Institutions, Amount	$ 115,410	$ 92,690
Minimum for Adequately Capitalized Institutions, Ratio	4.50%	4.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital	$ 348,228	$ 288,451
Actual, Ratio	10.84%	10.57%
Minimum for Adequately Capitalized Institutions, Amount	$ 128,543	$ 109,209
Minimum for Adequately Capitalized Institutions, Ratio	4.00%	4.00%
Components of regulatory capital [Abstract]
Total shareholders' equity	$ 345,204	$ 264,933
Add (deduct) [Abstract]
Accumulated other comprehensive loss for regulatory purposes	4,092	201
Goodwill and other intangibles	(35,009)	(1,269)
Disallowed deferred tax assets	(4,206)	(7,931)
Common equity tier 1 capital	310,081	255,934
Qualifying trust preferred securities	38,147	34,500
Disallowed deferred tax assets	0	(1,983)
Tier 1 capital	348,228	288,451
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	25,520	23,712
Total risk-based capital	373,748	312,163
Independent Bank [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital	$ 337,905	$ 290,188
Actual, Ratio	13.18%	14.10%
Minimum for Adequately Capitalized Institutions, Amount	$ 205,044	$ 164,675
Minimum for Adequately Capitalized Institutions, Ratio	8.00%	8.00%
Minimum for Well Capitalized Institutions, Amount	$ 256,305	$ 205,843
Minimum for Well-Capitalized Institutions, Ratio	10.00%	10.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount	$ 312,385	$ 266,476
Actual, Ratio	12.19%	12.95%
Minimum for Adequately Capitalized Institutions, Amount	$ 153,783	$ 123,506
Minimum for Adequately Capitalized Institutions, Ratio	6.00%	6.00%
Minimum for Well-Capitalized Institutions, Amount	$ 205,044	$ 164,675
Minimum for Well Capitalized Institutions, Ratio	8.00%	8.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount	$ 312,385	$ 266,476
Actual, Ratio	12.19%	12.95%
Minimum for Adequately Capitalized Institutions, Amount	$ 115,337	$ 92,630
Minimum for Adequately Capitalized Institutions, Ratio	4.50%	4.50%
Minimum for Well-Capitalized Institutions, Amount	$ 166,598	$ 133,798
Minimum for Well Capitalized Institutions, Ratio	6.50%	6.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital	$ 312,385	$ 266,476
Actual, Ratio	9.73%	9.78%
Minimum for Adequately Capitalized Institutions, Amount	$ 128,376	$ 109,041
Minimum for Adequately Capitalized Institutions, Ratio	4.00%	4.00%
Minimum for Well-Capitalized Institutions, Amount	$ 160,469	$ 136,301
Minimum for Well-Capitalized Institutions, Ratio	5.00%	5.00%
Components of regulatory capital [Abstract]
Total shareholders' equity	$ 343,351	$ 269,481
Add (deduct) [Abstract]
Accumulated other comprehensive loss for regulatory purposes	4,092	201
Goodwill and other intangibles	(35,009)	(1,269)
Disallowed deferred tax assets	(49)	(1,937)
Common equity tier 1 capital	312,385	266,476
Qualifying trust preferred securities	0	0
Disallowed deferred tax assets	0	0
Tier 1 capital	312,385	266,476
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	25,520	23,712
Total risk-based capital	$ 337,905	$ 290,188

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