Regulatory Matters (Details) (USD $)	0 Months Ended	3 Months Ended
	Jan. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Feb. 17, 2015	Dec. 31, 2014	Apr. 09, 2014	Dec. 31, 2013	Jul. 02, 2013
Regulatory Matters [Abstract]
Undivided profits			$ (27,100,000)
Common Equity Tier One Risk Based Capital To Risk Weighted Assets Required (in hundredths)								4.50%
Common Equity Tier One Risk Based Capital To Risk Weighted Assets Conservation Buffer Required (in hundredths)								2.50%
Minimum leverage ratio (in hundredths)								4.00%
Subsequent Event [Line Items]
Request for approval to transfer capital from bank to parent entity	18,500,000	15,000,000
Transfer of capital from bank to the parent company				18,500,000		15,000,000
Components of regulatory capital [Abstract]
Total shareholders' equity		236,586,000	253,625,000		250,371,000		231,581,000
Add (deduct) [Abstract]
Accumulated other comprehensive loss		(7,644,000)	(4,202,000)		(5,636,000)		(9,245,000)
Intangible assets			(2,540,000)		(2,627,000)
Minimum [Member]
Tier 1 capital to risk-weighted assets [Abstract]
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)								4.00%
Add (deduct) [Abstract]
Minimum ratio of tier 1 capital to risk weighted assets (in hundredths)								4.00%
Maximum [Member]
Tier 1 capital to risk-weighted assets [Abstract]
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)								6.00%
Add (deduct) [Abstract]
Minimum ratio of tier 1 capital to risk weighted assets (in hundredths)								6.00%
Consolidated [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital			271,391,000		265,163,000
Minimum for Adequately Capitalized Institutions, Amount			125,611,000		117,427,000
Actual, Ratio (in hundredths)			17.28%		18.06%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			8.00%		8.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			251,443,000		246,628,000
Minimum for Adequately Capitalized Institutions, Amount			94,208,000		58,714,000
Actual, Ratio (in hundredths)			16.01%		16.80%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			6.00%		4.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			237,386,000		212,128,000
Minimum for Adequately Capitalized Institutions, Amount			62,806,000
Actual, Ratio (in hundredths)			15.12%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			4.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital			251,443,000		246,628,000
Minimum for Adequately Capitalized Institutions, Amount			89,647,000		88,206,000
Actual, Ratio (in hundredths)			11.22%		11.18%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			4.00%		4.00%
Components of regulatory capital [Abstract]
Total shareholders' equity			253,625,000		250,371,000
Add (deduct) [Abstract]
Accumulated other comprehensive loss			(1,596,000)		5,636,000
Intangible assets			(1,016,000)		(2,627,000)
Disallowed deferred tax assets			(13,627,000)		(40,500,000)
Disallowed capitalized mortgage loan servicing rights			0		(752,000)
Common equity tier 1 capital			237,386,000		212,128,000
Qualifying trust preferred securities			34,500,000		34,500,000
Disallowed deferred tax assets			(20,443,000)		0
Tier 1 capital			251,443,000		246,628,000
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets			19,948,000		18,535,000
Total risk-based capital			271,391,000		265,163,000
Minimum ratio of tier 1 capital to risk weighted assets (in hundredths)			6.00%		4.00%
Independent Bank [Member]
Total capital to risk-weighted assets [Abstract]
Total risk-based capital			237,073,000		247,883,000
Minimum for Adequately Capitalized Institutions, Amount			125,456,000		117,374,000
Minimum for Well Capitalized Institutions, Amount			156,820,000		146,718,000
Actual, Ratio (in hundredths)			15.12%		16.90%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			8.00%		8.00%
Minimum for Well-Capitalized Institutions, Ratio (in hundredths)			10.00%		10.00%
Tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			217,216,000		229,361,000
Minimum for Adequately Capitalized Institutions, Amount			94,092,000		58,687,000
Minimum for Well-Capitalized Institutions, Amount			125,456,000		88,031,000
Actual, Ratio (in hundredths)			13.85%		15.63%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			6.00%		4.00%
Minimum for Well Capitalized Institutions, Ratio (in hundredths)			8.00%		6.00%
Common equity tier 1 capital to risk-weighted assets [Abstract]
Actual, Amount			217,216,000		229,361,000
Minimum for Adequately Capitalized Institutions, Amount			70,569,000
Minimum for Well-Capitalized Institutions, Amount			101,933,000
Actual, Ratio (in hundredths)			13.85%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			4.50%
Minimum for Well Capitalized Institutions, Ratio (in hundredths)			6.50%
Tier 1 capital to average assets [Abstract]
Tier 1 capital			217,216,000		229,361,000
Minimum for Adequately Capitalized Institutions, Amount			89,576,000		87,687,000
Minimum for Well-Capitalized Institutions, Amount			111,970,000		109,609,000
Actual, Ratio (in hundredths)			9.70%		10.46%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)			4.00%		4.00%
Minimum for Well-Capitalized Institutions, Ratio (in hundredths)			5.00%		5.00%
Components of regulatory capital [Abstract]
Total shareholders' equity			244,807,000		257,832,000
Add (deduct) [Abstract]
Accumulated other comprehensive loss			(1,596,000)		5,636,000
Intangible assets			(1,016,000)		(2,627,000)
Disallowed deferred tax assets			(24,979,000)		(30,728,000)
Disallowed capitalized mortgage loan servicing rights			0		(752,000)
Common equity tier 1 capital			217,216,000		229,361,000
Qualifying trust preferred securities			0		0
Disallowed deferred tax assets			0		0
Tier 1 capital			217,216,000		229,361,000
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets			19,857,000		18,522,000
Total risk-based capital			$ 237,073,000		$ 247,883,000
Minimum ratio of tier 1 capital to risk weighted assets (in hundredths)			6.00%		4.00%