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Securities (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Securities Available-for-Sale [Abstract] |  |  |
Amortized Cost | $ 621,753,000 | $ 583,858,000 |
Gross Unrealized Gains | 6,457,000 | 19,970,000 |
Gross Unrealized Losses | (18,805,000) | (485,000) |
Fair Value | 609,405,000 | 603,343,000 |
Securities Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,662,000 | 1,662,000 |
Gross Unrealized Gains | 1,000 | 1,000 |
Gross Unrealized Losses | (62,000) | (4,000) |
Fair Value | 1,601,000 | 1,659,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Due in one year or less | 3,844,000 |  |
Due after one through five years | 29,673,000 |  |
Due after five through ten years | 117,690,000 |  |
Due after ten years | 32,372,000 |  |
U.S. government sponsored agency mortgage-backed securities | 383,174,000 |  |
Total debt securities | 566,753,000 |  |
Marketable equity securities | 55,000,000 |  |
Total securities | 621,753,000 |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Due in one year or less | 3,863,000 |  |
Due after one through five years | 30,137,000 |  |
Due after five through ten years | 112,175,000 |  |
Due after ten years | 31,138,000 |  |
U.S. government sponsored agency mortgage-backed securities | 379,310,000 |  |
Total debt securities | 556,623,000 |  |
Marketable equity securities | 52,782,000 |  |
Total securities | 609,405,000 |  |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Due in one year or less | 0 |  |
Due after one through five years | 0 |  |
Due after five through ten years | 1,182,000 |  |
Due after ten years | 480,000 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  |
Total debt securities | 1,662,000 |  |
Marketable equity securities | 0 |  |
Total securities | 1,662,000 |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Due in one year or less | 0 |  |
Due after one through five years | 0 |  |
Due after five through ten years | 1,183,000 |  |
Due after ten years | 418,000 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  |
Total debt securities | 1,601,000 |  |
Marketable equity securities | 0 |  |
Total securities | 1,601,000 |  |
Securities gains (loss), net | (45,000) | 1,155,000 | 218,000
Realized pre-tax gain on sale of securities | 612,000 | 2,400,000 | 218,000
Realized pre-tax loss on sale of securities | 657,000 | 1,200,000 |
Securities pledged as collateral to secure public deposit and for other purposes | 257,500,000 | 262,400,000 |
Amortized cost of securities sold under agreements to repurchase | 255,400,000 | 237,300,000 |
Percentage of total investment with unrealized losses (in hundredths) | 67.80% | 14.80% |
CTBI fixed income mutual funds of total fair value | 52,800,000 |  |
CTBI fixed income mutual funds of total unrealized losses | 2,200,000 |  |
Percentage included in total fair value in CTBI (in hundredths) | 54.00% |  |
Percentage included in total unrealized losses in CTBI (in hundredths) | 68.00% |  |
Percentage included in total fair value in CRA (in hundredths) | 46.00% |  |
Percentage included in total unrealized losses in CRA (in hundredths) | 32.00% |  |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 382,620,000 | 89,265,000 |
12 Months or More | 49,968,000 |  |
Total | 432,588,000 | 89,265,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (14,806,000) | (485,000) |
12 Months or More | (3,999,000) |  |
Total | (18,805,000) | (485,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 367,814,000 | 88,780,000 |
12 Months or More | 45,969,000 |  |
Total | 413,783,000 | 88,780,000 |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 480,000 | 480,000 |
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (62,000) | (4,000) |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Less Than 12 Months | 418,000 | 476,000 |
Maximum [Member] |  |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Percentage Severity of the impairment in fair value (in hundredths) | 5.00% |  |
Minimum [Member] |  |  |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Percentage Severity of the impairment in fair value (in hundredths) | 2.80% |  |
U.S. Treasury and government agencies [Member] |  |  |
Securities Available-for-Sale [Abstract] |  |  |
Amortized Cost | 65,524,000 | 60,625,000 |
Gross Unrealized Gains | 225,000 | 463,000 |
Gross Unrealized Losses | (5,139,000) | (173,000) |
Fair Value | 60,610,000 | 60,915,000 |
Securities Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 480,000 | 480,000 |
Gross Unrealized Gains | 0 | 0 |
Gross Unrealized Losses | (62,000) | (4,000) |
Fair Value | 418,000 | 476,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 21,750,000 | 47,576,000 |
12 Months or More | 35,750,000 |  |
Total | 57,500,000 | 47,576,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (1,617,000) | (173,000) |
12 Months or More | (3,522,000) |  |
Total | (5,139,000) | (173,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 20,133,000 | 47,403,000 |
12 Months or More | 32,228,000 |  |
Total | 52,361,000 | 47,403,000 |
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 480,000 | 480,000 |
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (62,000) | (4,000) |
Held-to-Maturity, Fair Value [Abstract] |  |  |
Less Than 12 Months | 418,000 | 476,000 |
State and political subdivisions [Member] |  |  |
Securities Available-for-Sale [Abstract] |  |  |
Amortized Cost | 118,055,000 | 107,987,000 |
Gross Unrealized Gains | 1,907,000 | 5,369,000 |
Gross Unrealized Losses | (3,259,000) | (135,000) |
Fair Value | 116,703,000 | 113,221,000 |
Securities Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,182,000 | 1,182,000 |
Gross Unrealized Gains | 1,000 | 1,000 |
Gross Unrealized Losses | 0 | 0 |
Fair Value | 1,183,000 | 1,183,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 57,165,000 | 11,126,000 |
12 Months or More | 7,639,000 |  |
Total | 64,804,000 | 11,126,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (2,789,000) | (135,000) |
12 Months or More | (470,000) |  |
Total | (3,259,000) | (135,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 54,376,000 | 10,991,000 |
12 Months or More | 7,169,000 |  |
Total | 61,545,000 | 10,991,000 |
U.S. government sponsored agency mortgage-backed securities [Member] |  |  |
Securities Available-for-Sale [Abstract] |  |  |
Amortized Cost | 383,174,000 | 370,246,000 |
Gross Unrealized Gains | 4,325,000 | 13,347,000 |
Gross Unrealized Losses | (8,189,000) | (12,000) |
Fair Value | 379,310,000 | 383,581,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 248,705,000 | 10,563,000 |
12 Months or More | 6,579,000 |  |
Total | 255,284,000 | 10,563,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (8,182,000) | (12,000) |
12 Months or More | (7,000) |  |
Total | (8,189,000) | (12,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 240,523,000 | 10,551,000 |
12 Months or More | 6,572,000 |  |
Total | 247,095,000 | 10,551,000 |
Debt securities [Member] |  |  |
Securities Available-for-Sale [Abstract] |  |  |
Amortized Cost | 566,753,000 | 538,858,000 |
Gross Unrealized Gains | 6,457,000 | 19,179,000 |
Gross Unrealized Losses | (16,587,000) | (320,000) |
Fair Value | 556,623,000 | 557,717,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 327,620,000 | 69,265,000 |
12 Months or More | 49,968,000 |  |
Total | 377,588,000 | 69,265,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (12,588,000) | (320,000) |
12 Months or More | (3,999,000) |  |
Total | (16,587,000) | (320,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 315,032,000 | 68,945,000 |
12 Months or More | 45,969,000 |  |
Total | 361,001,000 | 68,945,000 |
Marketable equity securities [Member] |  |  |
Securities Available-for-Sale [Abstract] |  |  |
Amortized Cost | 55,000,000 | 45,000,000 |
Gross Unrealized Gains | 0 | 791,000 |
Gross Unrealized Losses | (2,218,000) | (165,000) |
Fair Value | 52,782,000 | 45,626,000 |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 55,000,000 | 20,000,000 |
12 Months or More | 0 |  |
Total | 55,000,000 | 20,000,000 |
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (2,218,000) | (165,000) |
12 Months or More | 0 |  |
Total | (2,218,000) | (165,000) |
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 52,782,000 | 19,835,000 |
12 Months or More | 0 |  |
Total | $ 52,782,000 | $ 19,835,000 |
Agency Securities [Member] |  |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Number of security sold | 1 | 4 | 1
Municipal securities [Member] |  |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Number of securities called | 2 | 1 | 0
Mortgage Backed Securities [Member] |  |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Number of security sold | 7 | 1 | 0
Auction Rate Securities [Member] |  |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Number of security sold | 0 | 5 | 0

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