Regulatory Matters (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015	Dec. 31, 2014
Regulatory Matters [Abstract]
Undivided profits			$ 8,700
Request for approval to transfer capital from bank to parent entity	$ 18,000	$ 18,500
Components of regulatory capital [Abstract]
Total shareholders' equity			250,902	$ 251,092	$ 252,980	$ 250,371
Add (deduct) [Abstract]
Accumulated other comprehensive (income) loss for regulatory purposes			(3,015)	(6,036)
Intangible assets			(2,019)	(2,280)
Consolidated [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital			281,310	278,170
Minimum for Adequately Capitalized Institutions, Amount			$ 140,243	$ 133,668
Actual, Ratio			16.05%	16.65%
Minimum for Adequately Capitalized Institutions, Ratio			8.00%	8.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			$ 259,279	$ 257,050
Minimum for Adequately Capitalized Institutions, Amount			$ 105,182	$ 100,251
Actual, Ratio			14.79%	15.38%
Minimum for Adequately Capitalized Institutions, Ratio			6.00%	6.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			$ 233,631	$ 239,271
Minimum for Adequately Capitalized Institutions, Amount			$ 78,886	$ 75,188
Actual, Ratio			13.33%	14.32%
Minimum for Adequately Capitalized Institutions, Ratio			4.50%	4.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital			$ 259,279	$ 257,050
Minimum for Adequately Capitalized Institutions, Amount			$ 98,174	$ 94,217
Actual, Ratio			10.56%	10.91%
Minimum for Adequately Capitalized Institutions, Ratio			4.00%	4.00%
Components of regulatory capital [Abstract]
Total shareholders' equity			$ 250,902	$ 251,092
Add (deduct) [Abstract]
Accumulated other comprehensive (income) loss for regulatory purposes			(2,783)	238
Intangible assets			(1,211)	(912)
Disallowed deferred tax assets			(13,277)	(11,147)
Common equity tier 1 capital			233,631	239,271
Qualifying trust preferred securities			34,500	34,500
Disallowed deferred tax assets			(8,852)	(16,721)
Tier 1 capital			259,279	257,050
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets			22,031	21,120
Total risk-based capital			281,310	278,170
Independent Bank [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital			269,578	261,894
Minimum for Adequately Capitalized Institutions, Amount			140,116	133,514
Minimum for Well Capitalized Institutions, Amount			$ 175,145	$ 166,893
Actual, Ratio			15.39%	15.69%
Minimum for Adequately Capitalized Institutions, Ratio			8.00%	8.00%
Minimum for Well-Capitalized Institutions, Ratio			10.00%	10.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			$ 247,615	$ 240,867
Minimum for Adequately Capitalized Institutions, Amount			105,087	100,136
Minimum for Well-Capitalized Institutions, Amount			$ 140,116	$ 133,514
Actual, Ratio			14.14%	14.43%
Minimum for Adequately Capitalized Institutions, Ratio			6.00%	6.00%
Minimum for Well Capitalized Institutions, Ratio			8.00%	8.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			$ 247,615	$ 240,867
Minimum for Adequately Capitalized Institutions, Amount			78,815	75,102
Minimum for Well-Capitalized Institutions, Amount			$ 113,844	$ 108,480
Actual, Ratio			14.14%	14.43%
Minimum for Adequately Capitalized Institutions, Ratio			4.50%	4.50%
Minimum for Well Capitalized Institutions, Ratio			6.50%	6.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital			$ 247,615	$ 240,867
Minimum for Adequately Capitalized Institutions, Amount			98,116	94,145
Minimum for Well-Capitalized Institutions, Amount			$ 122,645	$ 117,682
Actual, Ratio			10.09%	10.23%
Minimum for Adequately Capitalized Institutions, Ratio			4.00%	4.00%
Minimum for Well-Capitalized Institutions, Ratio			5.00%	5.00%
Components of regulatory capital [Abstract]
Total shareholders' equity			$ 263,762	$ 259,947
Add (deduct) [Abstract]
Accumulated other comprehensive (income) loss for regulatory purposes			(2,782)	238
Intangible assets			(1,211)	(912)
Disallowed deferred tax assets			(12,154)	(18,406)
Common equity tier 1 capital			247,615	240,867
Qualifying trust preferred securities			0	0
Disallowed deferred tax assets			0	0
Tier 1 capital			247,615	240,867
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets			21,963	21,027
Total risk-based capital			$ 269,578	$ 261,894