Regulatory Matters (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Regulatory Matters [Abstract]
Undivided profits	$ (5,700)
Request for approval to transfer capital from bank to parent entity	18,000	$ 18,500
Components of regulatory capital [Abstract]
Total shareholders' equity	239,545	$ 253,625	$ 251,092	$ 250,371
Add (deduct) [Abstract]
Accumulated other comprehensive (income) loss for regulatory purposes	(4,799)		(6,036)
Intangible assets	(2,193)		(2,280)
Consolidated [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital	268,031		278,170
Minimum for Adequately Capitalized Institutions, Amount	$ 135,651		$ 133,668
Actual, Ratio	15.81%		16.65%
Minimum for Adequately Capitalized Institutions, Ratio	8.00%		8.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount	$ 246,688		$ 257,050
Minimum for Adequately Capitalized Institutions, Amount	$ 101,738		$ 100,251
Actual, Ratio	14.55%		15.38%
Minimum for Adequately Capitalized Institutions, Ratio	6.00%		6.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount	$ 222,205		$ 239,271
Minimum for Adequately Capitalized Institutions, Amount	$ 76,304		$ 75,188
Actual, Ratio	13.10%		14.32%
Minimum for Adequately Capitalized Institutions, Ratio	4.50%		4.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital	$ 246,688		$ 257,050
Minimum for Adequately Capitalized Institutions, Amount	$ 95,713		$ 94,217
Actual, Ratio	10.31%		10.91%
Minimum for Adequately Capitalized Institutions, Ratio	4.00%		4.00%
Components of regulatory capital [Abstract]
Total shareholders' equity	$ 239,545		$ 251,092
Add (deduct) [Abstract]
Accumulated other comprehensive (income) loss for regulatory purposes	(999)		238
Intangible assets	(1,316)		(912)
Disallowed deferred tax assets	(15,025)		(11,147)
Common equity tier 1 capital	222,205		239,271
Qualifying trust preferred securities	34,500		34,500
Disallowed deferred tax assets	(10,017)		(16,721)
Tier 1 capital	246,688		257,050
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	21,343		21,120
Total risk-based capital	268,031		278,170
Independent Bank [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital	251,157		261,894
Minimum for Adequately Capitalized Institutions, Amount	135,503		133,514
Minimum for Well Capitalized Institutions, Amount	$ 169,379		$ 166,893
Actual, Ratio	14.83%		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	$ 229,884		$ 240,867
Minimum for Adequately Capitalized Institutions, Amount	101,628		100,136
Minimum for Well-Capitalized Institutions, Amount	$ 135,503		$ 133,514
Actual, Ratio	13.57%		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	$ 229,884		$ 240,867
Minimum for Adequately Capitalized Institutions, Amount	76,221		75,102
Minimum for Well-Capitalized Institutions, Amount	$ 110,097		$ 108,480
Actual, Ratio	13.57%		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	$ 229,884		$ 240,867
Minimum for Adequately Capitalized Institutions, Amount	95,647		94,145
Minimum for Well-Capitalized Institutions, Amount	$ 119,559		$ 117,682
Actual, Ratio	9.61%		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	$ 247,567		$ 259,947
Add (deduct) [Abstract]
Accumulated other comprehensive (income) loss for regulatory purposes	(999)		238
Intangible assets	(1,316)		(912)
Disallowed deferred tax assets	(15,368)		(18,406)
Common equity tier 1 capital	229,884		240,867
Qualifying trust preferred securities	0		0
Disallowed deferred tax assets	0		0
Tier 1 capital	229,884		240,867
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets	21,273		21,027
Total risk-based capital	$ 251,157		$ 261,894