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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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