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Securities (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013
Available-for-Sale [Abstract]
Amortized Cost	$ 647,122,000		$ 647,122,000		$ 621,753,000
Gross Unrealized Gains	7,679,000		7,679,000		6,457,000
Gross Unrealized Losses	(7,265,000)		(7,265,000)		(18,805,000)
Fair Value	647,536,000		647,536,000		609,405,000
Available-for-sale Equity Securities [Abstract]
Amortized Cost	25,000,000		25,000,000		55,000,000
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	(249,000)		(249,000)		(2,218,000)
Fair Value	24,751,000		24,751,000		52,782,000
Available-for-sale Debt Securities [Abstract]
Amortized Cost	622,122,000		622,122,000		566,753,000
Gross Unrealized Gains	7,679,000		7,679,000		6,457,000
Gross Unrealized Losses	(7,016,000)		(7,016,000)		(16,587,000)
Fair Value	622,785,000		622,785,000		556,623,000
Held-to-Maturity [Abstract]
Amortized Cost	1,662,000		1,662,000		1,662,000
Gross Unrealized Gains	1,000		1,000		1,000
Gross Unrealized Losses	(31,000)		(31,000)		(62,000)
Fair Value	1,632,000		1,632,000		1,601,000
Available-for-Sale, Amortized Cost [Abstract]
Due in one year or less	3,443,000		3,443,000
Due after one through five years	106,802,000		106,802,000
Due after five through ten years	126,757,000		126,757,000
Due after ten years	37,330,000		37,330,000
U.S. government sponsored agency mortgage-backed securities	347,790,000		347,790,000
Amortized Cost	622,122,000		622,122,000		566,753,000
Marketable equity securities	25,000,000		25,000,000		55,000,000
Amortized Cost	647,122,000		647,122,000		621,753,000
Available-for-Sale, Fair Value [Abstract]
Due in one year or less	3,482,000		3,482,000
Due after one through five years	107,691,000		107,691,000
Due after five through ten years	126,150,000		126,150,000
Due after ten years	37,658,000		37,658,000
U.S. government sponsored agency mortgage-backed securities	347,804,000		347,804,000
Total debt securities	622,785,000		622,785,000
Marketable equity securities	24,751,000		24,751,000
Total securities	647,536,000		647,536,000
Held-to-Maturity, Amortized Cost [Abstract]
Due in one year or less	0		0
Due after one through five years	0		0
Due after five through ten years	1,182,000		1,182,000
Due after ten years	480,000		480,000
U.S. government sponsored agency mortgage-backed securities	0		0
Amortized Cost	1,662,000		1,662,000		1,662,000
Marketable equity securities	0		0
Total securities	1,662,000		1,662,000
Held-to-Maturity, Fair Value [Abstract]
Due in one year or less	0		0
Due after one through five years	0		0
Due after five through ten years	1,183,000		1,183,000
Due after ten years	449,000		449,000
U.S. government sponsored agency mortgage-backed securities	0		0
Total debt securities	1,632,000		1,632,000		1,601,000
Marketable equity securities	0		0
Total securities	1,632,000		1,632,000
Securities gains (loss), net	(51,000)	(8,000)	(111,000)	(8,000)
Realized pre-tax gain on sale of securities			1,800,000	0
Realized pre-tax loss on sale of securities			1,900,000	0
Securities pledged as collateral to secure public deposit and for other purposes	243,000,000		243,000,000		257,500,000
Amortized cost of securities sold under agreements to repurchase	260,100,000		260,100,000		255,400,000
Percentage of total investment with unrealized losses (in hundredths)	46.30%		46.30%		67.80%
CTBI fixed income mutual funds of total fair value			24,800,000
CTBI fixed income mutual funds of total unrealized losses			249,000
Percentage Severity of the impairment in fair value less than cost (in hundredths)	1.00%		1.00%
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	95,757,000		95,757,000		382,620,000
12 Months or More	211,323,000		211,323,000		49,968,000
Total	307,080,000		307,080,000		432,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months			(594,000)		(14,806,000)
12 Months or More			(6,671,000)		(3,999,000)
Total			(7,265,000)		(18,805,000)
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	95,163,000		95,163,000		367,814,000
12 Months or More	204,652,000		204,652,000		45,969,000
Total	299,815,000		299,815,000		413,783,000
Held-to-Maturity, Amortized Cost [Abstract]
12 Months or More	480,000		480,000		480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]
12 Months or More			(31,000)		(62,000)
Held-to-Maturity, Fair Value [Abstract]
12 Months or More	449,000		449,000		418,000
U.S. Treasury and government agencies [Member]
Available-for-sale Debt Securities [Abstract]
Amortized Cost	139,938,000		139,938,000		65,524,000
Gross Unrealized Gains	429,000		429,000		225,000
Gross Unrealized Losses	(2,490,000)		(2,490,000)		(5,139,000)
Fair Value	137,877,000		137,877,000		60,610,000
Held-to-Maturity [Abstract]
Amortized Cost	480,000		480,000		480,000
Gross Unrealized Gains	0		0		0
Gross Unrealized Losses	(31,000)		(31,000)		(62,000)
Fair Value	449,000		449,000		418,000
Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	139,938,000		139,938,000		65,524,000
Held-to-Maturity, Amortized Cost [Abstract]
Amortized Cost	480,000		480,000		480,000
Held-to-Maturity, Fair Value [Abstract]
Total debt securities	449,000		449,000		418,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	3,031,000		3,031,000		21,750,000
12 Months or More	55,519,000		55,519,000		35,750,000
Total	58,550,000		58,550,000		57,500,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months			(19,000)		(1,617,000)
12 Months or More			(2,471,000)		(3,522,000)
Total			(2,490,000)		(5,139,000)
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	3,012,000		3,012,000		20,133,000
12 Months or More	53,048,000		53,048,000		32,228,000
Total	56,060,000		56,060,000		52,361,000
Held-to-Maturity, Amortized Cost [Abstract]
12 Months or More	480,000		480,000		480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract]
12 Months or More			(31,000)		(62,000)
Held-to-Maturity, Fair Value [Abstract]
12 Months or More	449,000		449,000		418,000
State and political subdivisions [Member]
Available-for-sale Debt Securities [Abstract]
Amortized Cost	134,394,000		134,394,000		118,055,000
Gross Unrealized Gains	3,607,000		3,607,000		1,907,000
Gross Unrealized Losses	(897,000)		(897,000)		(3,259,000)
Fair Value	137,104,000		137,104,000		116,703,000
Held-to-Maturity [Abstract]
Amortized Cost	1,182,000		1,182,000		1,182,000
Gross Unrealized Gains	1,000		1,000		1,000
Gross Unrealized Losses	0		0		0
Fair Value	1,183,000		1,183,000		1,183,000
Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	134,394,000		134,394,000		118,055,000
Held-to-Maturity, Amortized Cost [Abstract]
Amortized Cost	1,182,000		1,182,000		1,182,000
Held-to-Maturity, Fair Value [Abstract]
Total debt securities	1,183,000		1,183,000		1,183,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	4,555,000		4,555,000		57,165,000
12 Months or More	31,336,000		31,336,000		7,639,000
Total	35,891,000		35,891,000		64,804,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months			(19,000)		(2,789,000)
12 Months or More			(878,000)		(470,000)
Total			(897,000)		(3,259,000)
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	4,536,000		4,536,000		54,376,000
12 Months or More	30,458,000		30,458,000		7,169,000
Total	34,994,000		34,994,000		61,545,000
U.S. government sponsored agency mortgage-backed securities [Member]
Available-for-sale Debt Securities [Abstract]
Amortized Cost	347,790,000		347,790,000		383,174,000
Gross Unrealized Gains	3,643,000		3,643,000		4,325,000
Gross Unrealized Losses	(3,629,000)		(3,629,000)		(8,189,000)
Fair Value	347,804,000		347,804,000		379,310,000
Available-for-Sale, Amortized Cost [Abstract]
Amortized Cost	347,790,000		347,790,000		383,174,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	88,171,000		88,171,000		248,705,000
12 Months or More	99,468,000		99,468,000		6,579,000
Total	187,639,000		187,639,000		255,284,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months			(556,000)		(8,182,000)
12 Months or More			(3,073,000)		(7,000)
Total			(3,629,000)		(8,189,000)
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	87,615,000		87,615,000		240,523,000
12 Months or More	96,395,000		96,395,000		6,572,000
Total	184,010,000		184,010,000		247,095,000
Debt securities [Member]
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	95,757,000		95,757,000		327,620,000
12 Months or More	186,323,000		186,323,000
Total	282,080,000		282,080,000		377,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months			(594,000)		(12,588,000)
12 Months or More			(6,422,000)
Total			(7,016,000)		(16,587,000)
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	95,163,000		95,163,000		315,032,000
12 Months or More	179,901,000		179,901,000
Total	275,064,000		275,064,000		361,001,000
Marketable equity securities [Member]
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	0		0		55,000,000
12 Months or More	25,000,000		25,000,000
Total	25,000,000		25,000,000		55,000,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months			0		(2,218,000)
12 Months or More			(249,000)
Total			(249,000)		(2,218,000)
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	0		0		52,782,000
12 Months or More	24,751,000		24,751,000
Total	$ 24,751,000		$ 24,751,000		$ 52,782,000

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