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Securities | 12 Months Ended
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Dec. 31, 2011
Securities [Abstract] |
Securities | 4. Securities Securities are classified into held-to-maturity and available-for-sale categories. Held-to-maturity (HTM) securities are those that CTBI has the positive intent and ability to hold to maturity and are reported at amortized cost. Available-for-sale (AFS) securities are those that CTBI may decide to sell if needed for liquidity, asset-liability management or other reasons. Available-for-sale securities are reported at fair value, with unrealized gains or losses included as a separate component of equity, net of tax. The amortized cost and fair value of securities at December 31, 2011 are summarized as follows: Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 32,077 |  |  | $ | 1,171 |  |  | $ | 0 |  |  | $ | 33,248 |
State and political subdivisions |  |  | 68,358 |  |  |  | 3,816 |  |  |  | (30 | ) |  |  | 72,144 |
U.S. government sponsored agency mortgage-backed securities |  |  | 390,213 |  |  |  | 10,180 |  |  |  | (57 | ) |  |  | 400,336 |
Collateralized mortgage obligations |  |  | 501 |  |  |  | 6 |  |  |  | 0 |  |  |  | 507 |
Total debt securities |  |  | 491,149 |  |  |  | 15,173 |  |  |  | (87 | ) |  |  | 506,235 |
Marketable equity securities |  |  | 20,582 |  |  |  | 718 |  |  |  | (137 | ) |  |  | 21,163 |
Total available-for-sale securities |  | $ | 511,731 |  |  | $ | 15,891 |  |  | $ | (224 | ) |  | $ | 527,398 |
Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
State and political subdivisions |  | $ | 1,182 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 1,182 |
Other debt securities |  |  | 480 |  |  |  | 0 |  |  |  | (1 | ) |  |  | 479 |
Total held-to-maturity securities |  | $ | 1,662 |  |  | $ | 0 |  |  | $ | (1 | ) |  | $ | 1,661 |
The amortized cost and fair value of securities at December 31, 2010 are summarized as follows: Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
U.S. Treasury and government agencies |  | $ | 29,154 |  |  | $ | 330 |  |  | $ | (230 | ) |  | $ | 29,254 |
State and political subdivisions |  |  | 52,017 |  |  |  | 690 |  |  |  | (842 | ) |  |  | 51,865 |
U.S. government sponsored agency mortgage-backed securities |  |  | 230,905 |  |  |  | 6,690 |  |  |  | (352 | ) |  |  | 237,243 |
Total debt securities |  |  | 312,076 |  |  |  | 7,710 |  |  |  | (1,424 | ) |  |  | 318,362 |
Marketable equity securities |  |  | 20,582 |  |  |  | 41 |  |  |  | (310 | ) |  |  | 20,313 |
Total available-for-sale securities |  | $ | 332,658 |  |  | $ | 7,751 |  |  | $ | (1,734 | ) |  | $ | 338,675 |
Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
State and political subdivisions |  | $ | 1,182 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 1,182 |
Other debt securities |  |  | 480 |  |  |  | 0 |  |  |  | 0 |  |  |  | 480 |
Total held-to-maturity securities |  | $ | 1,662 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 1,662 |
The amortized cost and fair value of securities at December 31, 2011 by contractual maturity are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.
|  | Available-for-Sale |  |  | Held-to-Maturity |
(in thousands) |  | Amortized Cost |  |  | Fair Value |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  | $ | 5,642 |  |  | $ | 5,698 |  |  | $ | 0 |  |  | $ | 0 |
Due after one through five years |  |  | 20,943 |  |  |  | 21,565 |  |  |  | 0 |  |  |  | 0 |
Due after five through ten years |  |  | 41,496 |  |  |  | 43,362 |  |  |  | 1,182 |  |  |  | 1,182 |
Due after ten years |  |  | 32,354 |  |  |  | 34,767 |  |  |  | 0 |  |  |  | 0 |
U.S. government sponsored agency mortgage-backed securities |  |  | 390,213 |  |  |  | 400,336 |  |  |  | 0 |  |  |  | 0 |
Collateralized mortgage obligations |  |  | 501 |  |  |  | 507 |  |  |  | 0 |  |  |  | 0 |
Other securities |  |  | 0 |  |  |  | 0 |  |  |  | 480 |  |  |  | 479 |
Total debt securities |  |  | 491,149 |  |  |  | 506,235 |  |  |  | 1,662 |  |  |  | 1,661 |
Marketable equity securities |  |  | 20,582 |  |  |  | 21,163 |  |  |  | 0 |  |  |  | 0 |
Total securities |  | $ | 511,731 |  |  | $ | 527,398 |  |  | $ | 1,662 |  |  | $ | 1,661 |
There was a pre-tax gain of $218 thousand realized in 2011 due to the sale of an agency security. There were no pre-tax gains or losses as of December 31, 2010. There was a combined gain of $658 thousand realized in 2009 due to sales of six securities and a loss of $4 thousand realized due to sales of two securities. The amortized cost of securities pledged as collateral, to secure public deposits and for other purposes, was $198.6 million at December 31, 2011 and $106.2 million at December 31, 2010. The amortized cost of securities sold under agreements to repurchase amounted to $217.2 million at December 31, 2011 and $188.3 million at December 31, 2010. Certain investments in debt and marketable equity securities are reported in the financial statements at amounts less than their historical costs. CTBI evaluates its investment portfolio on a quarterly basis for impairment. The analysis performed as of December 31, 2011 indicates that all impairment is considered temporary, market driven, and not credit-related. The percentage of total investments with unrealized losses as of December 31, 2011 was 4.8% compared to 18.9% as of December 31, 2010. The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2011 that are not deemed to be other-than-temporarily impaired. Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
State and political subdivisions |  | $ | 6,173 |  |  | $ | (25 | ) |  | $ | 6,148 |
U.S. government sponsored agency mortgage-backed securities |  |  | 17,900 |  |  |  | (57 | ) |  |  | 17,843 |
Total debt securities |  |  | 24,073 |  |  |  | (82 | ) |  |  | 23,991 |
Marketable equity securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  |  | 24,073 |  |  |  | (82 | ) |  |  | 23,991 |
12 Months or More |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  |  | 613 |  |  |  | (5 | ) |  |  | 608 |
U.S. government sponsored agency mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Total debt securities |  |  | 613 |  |  |  | (5 | ) |  |  | 608 |
Marketable equity securities |  |  | 329 |  |  |  | (137 | ) |  |  | 192 |
|  |  | 942 |  |  |  | (142 | ) |  |  | 800 |
Total |  |  |  |  |  |  |  |  |  |  |  |
State and political subdivisions |  |  | 6,786 |  |  |  | (30 | ) |  |  | 6,756 |
U.S. government sponsored agency mortgage-backed securities |  |  | 17,900 |  |  |  | (57 | ) |  |  | 17,843 |
Total debt securities |  |  | 24,686 |  |  |  | (87 | ) |  |  | 24,599 |
Marketable equity securities |  |  | 329 |  |  |  | (137 | ) |  |  | 192 |
Total temporarily impaired AFS securities |  | $ | 25,015 |  |  | $ | (224 | ) |  | $ | 24,791 |
Held-to-Maturity
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
State and political subdivisions |  | $ | 0 |  |  | $ | 0 |  |  | $ | 0 |
Other debt securities |  |  | 480 |  |  |  | (1 | ) |  |  | 479 |
Total temporarily impaired HTM securities |  | $ | 480 |  |  | $ | (1 | ) |  | $ | 479 |
The analysis performed as of December 31, 2010 indicated that all impairment was considered temporary, market driven, and not credit-related. The following tables provide the amortized cost, gross unrealized losses, and fair market value, aggregated by investment category and length of time the individual securities have been in a continuous unrealized loss position as of December 31, 2010 that are not deemed to be other-than-temporarily impaired. Available-for-Sale
(in thousands) |  | Amortized Cost |  |  | Gross Unrealized Losses |  |  | Fair Value |
Less Than 12 Months |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  | $ | 10,384 |  |  | $ | (230 | ) |  | $ | 10,154 |
State and political subdivisions |  |  | 24,624 |  |  |  | (826 | ) |  |  | 23,798 |
U.S. government sponsored agency mortgage-backed securities |  |  | 30,016 |  |  |  | (352 | ) |  |  | 29,664 |
Total debt securities |  |  | 65,024 |  |  |  | (1,408 | ) |  |  | 63,616 |
Marketable equity securities |  |  | 42 |  |  |  | (17 | ) |  |  | 25 |
|  |  | 65,066 |  |  |  | (1,425 | ) |  |  | 63,641 |
12 Months or More |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
State and political subdivisions |  |  | 590 |  |  |  | (16 | ) |  |  | 574 |
U.S. government sponsored agency mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Total debt securities |  |  | 590 |  |  |  | (16 | ) |  |  | 574 |
Marketable equity securities |  |  | 329 |  |  |  | (293 | ) |  |  | 36 |
|  |  | 919 |  |  |  | (309 | ) |  |  | 610 |
Total |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasury and government agencies |  |  | 10,384 |  |  |  | (230 | ) |  |  | 10,154 |
State and political subdivisions |  |  | 25,214 |  |  |  | (842 | ) |  |  | 24,372 |
U.S. government sponsored agency mortgage-backed securities |  |  | 30,016 |  |  |  | (352 | ) |  |  | 29,664 |
Total debt securities |  |  | 65,614 |  |  |  | (1,424 | ) |  |  | 64,190 |
Marketable equity securities |  |  | 371 |  |  |  | (310 | ) |  |  | 61 |
Total temporarily impaired securities |  | $ | 65,985 |  |  | $ | (1,734 | ) |  | $ | 64,251 |
As of December 31, 2010, there were no held-to-maturity securities with unrealized losses.

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- Definition Tabular disclosure of marketable securities. This may consist of investments in certain debt and equity securities, short-term investments and other assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26626-111562 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2,12) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27161-111563 + Details
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