Regulatory Matters (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Jun. 30, 2014 Consolidated [Member]	Dec. 31, 2013 Consolidated [Member]	Jun. 30, 2014 Independent Bank [Member]	Dec. 31, 2013 Independent Bank [Member]	Apr. 09, 2014 Subsequent Event [Member]
Regulatory Matters [Abstract]
Undivided profits		$ (40,300,000)
Maximum percentage of allowance for loan losses and allowance for unfunded lending commitments (in hundredths)		1.25%
Subsequent Event [Line Items]
Request for approval to transfer capital from bank to parent entity	15,000,000
Transfer of capital from bank to the parent company											15,000,000
Total capital to risk-weighted assets [Abstract]
Total risk-based capital							259,196,000	245,284,000	234,562,000	234,078,000
Minimum for Adequately Capitalized Institutions, Amount							115,195,000	113,086,000	114,910,000	113,013,000
Minimum for Well Capitalized Institutions, Amount									143,638,000	141,267,000
Actual, Ratio (in hundredths)							18.00%	17.35%	16.33%	16.57%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)							8.00%	8.00%	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							240,978,000	227,338,000	216,394,000	216,146,000
Minimum for Adequately Capitalized Institutions, Amount							57,597,000	56,543,000	57,455,000	56,507,000
Minimum for Well-Capitalized Institutions, Amount									86,183,000	84,760,000
Actual, Ratio (in hundredths)							16.74%	16.08%	15.07%	15.30%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)							4.00%	4.00%	4.00%	4.00%
Minimum for Well Capitalized Institutions, Ratio (in hundredths)									6.00%	6.00%
Tier 1 capital to average assets [Abstract]
Tier 1 capital							240,978,000	227,338,000	216,394,000	216,146,000
Minimum for Adequately Capitalized Institutions, Amount							87,643,000	85,729,000	87,384,000	85,681,000
Minimum for Well-Capitalized Institutions, Amount									109,230,000	107,101,000
Actual, Ratio (in hundredths)							11.00%	10.61%	9.91%	10.09%
Minimum for Adequately Capitalized Institutions, Ratio (in hundredths)							4.00%	4.00%	4.00%	4.00%
Minimum for Well-Capitalized Institutions, Ratio (in hundredths)									5.00%	5.00%
Components of regulatory capital [Abstract]
Total shareholders' equity		242,961,000	231,581,000	208,835,000		134,975,000	242,961,000	231,581,000	247,995,000	250,306,000
Add (deduct) [Abstract]
Qualifying trust preferred securities							39,500,000	39,500,000	0	0
Accumulated other comprehensive loss	(7,644,000)	(6,298,000)	(9,245,000)	(7,270,000)	(6,953,000)	(8,058,000)	6,298,000	9,245,000	6,298,000	9,245,000
Intangible assets		(2,895,000)	(3,163,000)				(2,895,000)	(3,163,000)	(2,895,000)	(3,163,000)
Disallowed deferred tax assets							(44,200,000)	(49,609,000)	(34,318,000)	(40,026,000)
Disallowed capitalized mortgage loan servicing rights							(686,000)	(216,000)	(686,000)	(216,000)
Tier 1 capital							240,978,000	227,338,000	216,394,000	216,146,000
Allowance for loan losses and allowance for unfunded lending commitments limited to 1.25% of total risk-weighted assets							18,218,000	17,946,000	18,168,000	17,932,000
Total risk-based capital							$ 259,196,000	$ 245,284,000	$ 234,562,000	$ 234,078,000