Regulatory Matters (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Regulatory Matters [Abstract]
Undivided profits		$ 11,200
Request for approval to transfer capital from bank to parent entity	$ 18,000
Components of regulatory capital [Abstract]
Total shareholders' equity	$ 239,545	255,475	$ 248,980	$ 251,092
Add (deduct) [Abstract]
Accumulated other comprehensive loss for regulatory purposes		(6,536)	(9,108)
Intangible assets		(1,845)	(1,932)
Consolidated [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital		291,505	286,289
Minimum for Adequately Capitalized Institutions, Amount		$ 148,484	$ 144,413
Actual, Ratio		15.71%	15.86%
Minimum for Adequately Capitalized Institutions, Ratio		8.00%	8.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount		$ 270,707	$ 265,405
Minimum for Adequately Capitalized Institutions, Amount		$ 111,363	$ 108,309
Actual, Ratio		14.59%	14.70%
Minimum for Adequately Capitalized Institutions, Ratio		6.00%	6.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount		$ 239,913	$ 238,996
Minimum for Adequately Capitalized Institutions, Amount		$ 83,522	$ 81,232
Actual, Ratio		12.93%	13.24%
Minimum for Adequately Capitalized Institutions, Ratio		4.50%	4.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital		$ 270,707	$ 265,405
Minimum for Adequately Capitalized Institutions, Amount		$ 101,693	$ 101,112
Actual, Ratio		10.65%	10.50%
Minimum for Adequately Capitalized Institutions, Ratio		4.00%	4.00%
Components of regulatory capital [Abstract]
Total shareholders' equity		$ 255,475	$ 248,980
Add (deduct) [Abstract]
Accumulated other comprehensive loss for regulatory purposes		738	3,310
Intangible assets		(1,476)	(1,159)
Disallowed deferred tax assets		(14,824)	(12,135)
Common equity tier 1 capital		239,913	238,996
Qualifying trust preferred securities		34,500	34,500
Disallowed deferred tax assets		(3,706)	(8,091)
Tier 1 capital		270,707	265,405
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets		20,798	20,884
Total risk-based capital		291,505	286,289
Independent Bank [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital		273,822	270,855
Minimum for Adequately Capitalized Institutions, Amount		148,308	144,223
Minimum for Well Capitalized Institutions, Amount		$ 185,384	$ 180,279
Actual, Ratio		14.77%	15.02%
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		$ 253,024	$ 249,971
Minimum for Adequately Capitalized Institutions, Amount		111,231	108,167
Minimum for Well-Capitalized Institutions, Amount		$ 148,308	$ 144,223
Actual, Ratio		13.65%	13.87%
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		$ 253,024	$ 249,971
Minimum for Adequately Capitalized Institutions, Amount		83,423	81,126
Minimum for Well-Capitalized Institutions, Amount		$ 120,500	$ 117,181
Actual, Ratio		13.65%	13.87%
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		$ 253,024	$ 249,971
Minimum for Adequately Capitalized Institutions, Amount		101,609	101,019
Minimum for Well-Capitalized Institutions, Amount		$ 127,011	$ 126,274
Actual, Ratio		9.96%	9.90%
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		$ 262,716	$ 258,814
Add (deduct) [Abstract]
Accumulated other comprehensive loss for regulatory purposes		738	3,310
Intangible assets		(1,476)	(1,159)
Disallowed deferred tax assets		(8,954)	(10,994)
Common equity tier 1 capital		253,024	249,971
Qualifying trust preferred securities		0	0
Disallowed deferred tax assets		0	0
Tier 1 capital		253,024	249,971
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets		20,798	20,884
Total risk-based capital		$ 273,822	$ 270,855