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Securities (Details) (USD $) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Available-for-Sale [Abstract] |  |  |
Amortized Cost | $ 656,335,000 |  | $ 621,753,000
Gross Unrealized Gains | 5,795,000 |  | 6,457,000
Gross Unrealized Losses | (12,003,000) |  | (18,805,000)
Fair Value | 650,127,000 |  | 609,405,000
Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 1,662,000 |  | 1,662,000
Gross Unrealized Gains | 1,000 |  | 1,000
Gross Unrealized Losses | (44,000) |  | (62,000)
Fair Value | 1,619,000 |  | 1,601,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Due in one year or less | 2,366,000 |  |
Due after one through five years | 104,520,000 |  |
Due after five through ten years | 123,723,000 |  |
Due after ten years | 39,399,000 |  |
U.S. government sponsored agency mortgage-backed securities | 361,327,000 |  |
Total debt securities | 631,335,000 |  |
Marketable equity securities | 25,000,000 |  |
Total securities | 656,335,000 |  |
Available-for-Sale, Fair Value [Abstract] |  |  |
Due in one year or less | 2,377,000 |  |
Due after one through five years | 104,901,000 |  |
Due after five through ten years | 120,778,000 |  |
Due after ten years | 38,993,000 |  |
U.S. government sponsored agency mortgage-backed securities | 358,651,000 |  |
Total debt securities | 625,700,000 |  |
Marketable equity securities | 24,427,000 |  |
Total securities | 650,127,000 |  |
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 | 436,000 |  |
U.S. government sponsored agency mortgage-backed securities | 0 |  |
Total debt securities | 1,619,000 |  |
Marketable equity securities | 0 |  |
Total securities | 1,619,000 |  |
Securities gains (loss), net | (60,000) | 0 |
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 | 236,000,000 |  | 257,500,000
Amortized cost of securities sold under agreements to repurchase | 254,600,000 |  | 255,400,000
Percentage of total investment with unrealized losses (in hundredths) | 65.70% |  | 67.80%
CTBI fixed income mutual funds of total fair value | 24,400,000 |  |
CTBI fixed income mutual funds of total unrealized losses | 573,000 |  |
Percentage Severity of the impairment in fair value less than cost (in hundredths) | 2.30% |  |
Duration of the impairment maximum | 12 months |  |
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 394,809,000 |  | 382,620,000
12 Months or More | 45,042,000 |  | 49,968,000
Total | 439,851,000 |  | 432,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (9,217,000) |  | (14,806,000)
12 Months or More | (2,786,000) |  | (3,999,000)
Total | (12,003,000) |  | (18,805,000)
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 385,592,000 |  | 367,814,000
12 Months or More | 42,256,000 |  | 45,969,000
Total | 427,848,000 |  | 413,783,000
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
12 Months or More | 480,000 |  | 480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
12 Months or More | (44,000) |  | (62,000)
Held-to-Maturity, Fair Value [Abstract] |  |  |
12 Months or More | 436,000 |  | 418,000
U.S. Treasury and government agencies [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 140,033,000 |  | 65,524,000
Gross Unrealized Gains | 229,000 |  | 225,000
Gross Unrealized Losses | (3,783,000) |  | (5,139,000)
Fair Value | 136,479,000 |  | 60,610,000
Held-to-Maturity [Abstract] |  |  |
Amortized Cost | 480,000 |  | 480,000
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | (44,000) |  | (62,000)
Fair Value | 436,000 |  | 418,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 66,121,000 |  | 21,750,000
12 Months or More | 35,750,000 |  | 35,750,000
Total | 101,871,000 |  | 57,500,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (1,364,000) |  | (1,617,000)
12 Months or More | (2,419,000) |  | (3,522,000)
Total | (3,783,000) |  | (5,139,000)
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 64,757,000 |  | 20,133,000
12 Months or More | 33,331,000 |  | 32,228,000
Total | 98,088,000 |  | 52,361,000
Held-to-Maturity, Amortized Cost [Abstract] |  |  |
12 Months or More | 480,000 |  | 480,000
Held-to-Maturity, Gross Unrealized Losses [Abstract] |  |  |
12 Months or More | (44,000) |  | (62,000)
Held-to-Maturity, Fair Value [Abstract] |  |  |
12 Months or More | 436,000 |  | 418,000
State and political subdivisions [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 129,975,000 |  | 118,055,000
Gross Unrealized Gains | 2,480,000 |  | 1,907,000
Gross Unrealized Losses | (1,885,000) |  | (3,259,000)
Fair Value | 130,570,000 |  | 116,703,000
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 | 46,229,000 |  | 57,165,000
12 Months or More | 9,292,000 |  | 7,639,000
Total | 55,521,000 |  | 64,804,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (1,518,000) |  | (2,789,000)
12 Months or More | (367,000) |  | (470,000)
Total | (1,885,000) |  | (3,259,000)
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 44,711,000 |  | 54,376,000
12 Months or More | 8,925,000 |  | 7,169,000
Total | 53,636,000 |  | 61,545,000
U.S. government sponsored agency mortgage-backed securities [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 361,327,000 |  | 383,174,000
Gross Unrealized Gains | 3,086,000 |  | 4,325,000
Gross Unrealized Losses | (5,762,000) |  | (8,189,000)
Fair Value | 358,651,000 |  | 379,310,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 257,459,000 |  | 248,705,000
12 Months or More |  |  | 6,579,000
Total | 257,459,000 |  | 255,284,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (5,762,000) |  | (8,182,000)
12 Months or More |  |  | (7,000)
Total | (5,762,000) |  | (8,189,000)
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 251,697,000 |  | 240,523,000
12 Months or More |  |  | 6,572,000
Total | 251,697,000 |  | 247,095,000
Debt securities [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 631,335,000 |  | 566,753,000
Gross Unrealized Gains | 5,795,000 |  | 6,457,000
Gross Unrealized Losses | (11,430,000) |  | (16,587,000)
Fair Value | 625,700,000 |  | 556,623,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 369,809,000 |  | 327,620,000
Total | 414,851,000 |  | 377,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (8,644,000) |  | (12,588,000)
Total | (11,430,000) |  | (16,587,000)
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 361,165,000 |  | 315,032,000
Total | 403,421,000 |  | 361,001,000
Marketable equity securities [Member] |  |  |
Available-for-Sale [Abstract] |  |  |
Amortized Cost | 25,000,000 |  | 55,000,000
Gross Unrealized Gains | 0 |  | 0
Gross Unrealized Losses | (573,000) |  | (2,218,000)
Fair Value | 24,427,000 |  | 52,782,000
Available-for-Sale, Amortized Cost [Abstract] |  |  |
Less Than 12 Months | 25,000,000 |  | 55,000,000
Total | 25,000,000 |  | 55,000,000
Available-for-Sale, Gross Unrealized Losses [Abstract] |  |  |
Less Than 12 Months | (573,000) |  | (2,218,000)
Total | (573,000) |  | (2,218,000)
Available-for-Sale, Fair Value [Abstract] |  |  |
Less Than 12 Months | 24,427,000 |  | 52,782,000
Total | $ 24,427,000 |  | $ 52,782,000

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