Condensed Consolidated Statements of Cash Flows (unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 10,938us-gaap_NetIncomeLoss	$ 10,140us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,016	1,121
Deferred taxes	385us-gaap_DeferredIncomeTaxExpenseBenefit	(443)us-gaap_DeferredIncomeTaxExpenseBenefit
Stock-based compensation	197us-gaap_ShareBasedCompensation	191us-gaap_ShareBasedCompensation
Excess tax benefits of stock-based compensation	153	6
Provision for loan losses	1,901us-gaap_ProvisionForLoanAndLeaseLosses	1,345us-gaap_ProvisionForLoanAndLeaseLosses
Write-downs of other real estate owned and other repossessed assets	64	874
Gains on sale of mortgage loans held for sale	(290)us-gaap_GainLossOnSaleOfMortgageLoans	(190)us-gaap_GainLossOnSaleOfMortgageLoans
Securities (gains) losses	(144)us-gaap_GainLossOnSaleOfSecuritiesNet	60us-gaap_GainLossOnSaleOfSecuritiesNet
Losses on sale of assets, net	24	14
Proceeds from sale of mortgage loans held for sale	13,032	8,583
Funding of mortgage loans held for sale	(11,983)	(9,176)
Amortization of securities premiums and discounts, net	690	664
Change in cash surrender value of bank owned life insurance	(395)	(356)
Mortgage servicing rights:
Fair value adjustments	255	229
New servicing assets created	(84)	(63)
Changes in:
Other assets	(2,052)	927
Other liabilities	8,277	699
Net cash provided by operating activities	21,984	14,625
Certificates of deposit in other banks:
Maturity of certificates of deposit	1,532ctbi_MaturityOfCertificatesOfDeposit	0ctbi_MaturityOfCertificatesOfDeposit
Securities available-for-sale (AFS):
Purchase of AFS securities	(5,755)	(168,168)
Proceeds from the sales of AFS securities	11,483	112,949
Proceeds from prepayments and maturities of AFS securities	12,879	19,911
Securities held-to-maturity (HTM):
Proceeds from maturities of HTM securities	1	0
Change in loans, net	(18,444)	28,250
Purchase of premises and equipment	(346)	(250)
Proceeds from sale of premises and equipment	0	18
Redemption of stock by Federal Home Loan Bank	0	7,746
Additional investment in Federal Reserve Bank stock	(18)	(1)
Proceeds from sale of other real estate and other repossessed assets	1,973	1,837
Additional investment in other real estate and other repossessed assets	(85)	0
Net cash provided by investing activities	3,220	2,292
Cash flows from financing activities:
Change in deposits, net	65,283us-gaap_IncreaseDecreaseInDeposits	69,115us-gaap_IncreaseDecreaseInDeposits
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	10,384	5,847
Advances from Federal Home Loan Bank	20,000	0
Payments on advances from Federal Home Loan Bank	(80,029)	(29)
Issuance of common stock	270	290
Netting of restricted stock	(189)	0
Excess tax benefits of stock-based compensation	(153)	(6)
Dividends paid	(5,238)us-gaap_PaymentsOfDividends	(5,086)us-gaap_PaymentsOfDividends
Net cash provided by financing activities	10,328	70,131
Net increase in cash and cash equivalents	35,532	87,048
Cash and cash equivalents at beginning of period	105,517	106,641
Cash and cash equivalents at end of period	141,049	193,689
Supplemental disclosures:
Income taxes paid	3,000us-gaap_IncomeTaxesPaid	4,100us-gaap_IncomeTaxesPaid
Interest paid	2,706us-gaap_InterestPaid	2,794us-gaap_InterestPaid
Non-cash activities:
Loans to facilitate the sale of other real estate and repossessed assets	1,722	1,415
Common stock dividends accrued, paid in subsequent quarter	221	201
Real estate acquired in settlement of loans	$ 5,570	$ 1,273

The cash outflow for payments to improve other real estate owned in preparation for sale.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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The gains (losses) included in earnings that represent the difference between the sale price and the carrying value of loans made to finance real estate acquisitions. This element refers to the gain (loss) and not to the cash proceeds of the sale. This element is a noncash adjustment to net income when calculating net cash generated by operating activities using the indirect method.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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The net gain (loss) realized from the sale, exchange, redemption, or retirement of securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity.

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Amount of expense related to estimated loss from loan and lease transactions.

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The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

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