Community Trust Bancorp (CTBI) 10-K 13 Mar 15 2014 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
In Millions, except Share data, unless otherwise specified	Dec. 31, 2014	Feb. 27, 2015	Jun. 30, 2014
Document and Entity Information [Abstract]
Entity Registrant Name	COMMUNITY TRUST BANCORP INC /KY/
Entity Central Index Key	350852
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$567
Entity Common Stock, Shares Outstanding		17,479,236
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Assets:
Cash and due from banks	$56,299	$64,828
Interest bearing deposits	44,285	33,200
Federal funds sold	4,933	8,613
Cash and cash equivalents	105,517	106,641
Certificates of deposit in other banks	8,197	9,568
Securities available-for-sale at fair value (amortized cost of $638,395 and $621,753, respectively)	640,186	609,405
Securities held-to-maturity at amortized cost (fair value of $1,644 and $1,601, respectively)	1,662	1,662
Loans held for sale	2,264	828
Loans	2,733,824	2,615,354
Allowance for loan and lease losses	-34,447	-34,008
Net loans	2,699,377	2,581,346
Premises and equipment, net	49,980	52,000
Federal Home Loan Bank stock	17,927	25,673
Federal Reserve Bank stock	4,869	4,886
Goodwill	65,490	65,490
Core deposit intangible (net of accumulated amortization of $8,138 and $7,925, respectively)	477	690
Bank owned life insurance	60,697	53,687
Mortgage servicing rights	2,968	3,424
Other real estate owned	36,776	39,188
Other assets	27,378	27,228
Total assets	3,723,765	3,581,716
Deposits
Noninterest bearing	677,626	621,321
Interest bearing	2,196,631	2,233,753
Total deposits	2,874,257	2,855,074
Repurchase agreements	235,186	208,067
Federal funds purchased and other short-term borrowings	11,041	12,465
Advances from Federal Home Loan Bank	61,170	1,286
Long-term debt	61,341	61,341
Other liabilities	32,893	30,991
Total liabilities	3,275,888	3,169,224
Commitments and contingencies (note 19)
Shareholders' equity:
Preferred stock, 300,000 shares authorized and unissued	0	0
Common stock, $5 par value, shares authorized 25,000,000; shares outstanding 2014 - 17,466,375; 2013 - 17,403,441	87,332	79,107
Capital surplus	214,684	167,122
Retained earnings	144,697	174,289
Accumulated other comprehensive income (loss), net of tax	1,164	-8,026
Total shareholders' equity	447,877	412,492
Total liabilities and shareholders' equity	$3,723,765	$3,581,716

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Assets:
Securities available-for-sale at amortized cost	$638,395	$621,753
Securities held-to-maturity at fair value	1,644	1,601
Core deposit intangible, accumulated amortization	$8,138	$7,925
Shareholders' equity:
Preferred stock, shares authorized (in shares)	300,000	300,000
Common stock, par value (in dollars per share)	$5	$5
Common stock, shares authorized (in shares)	25,000,000	25,000,000
Common stock, shares outstanding (in shares)	17,466,375	17,403,441

Consolidated_Statements_of_Inc

Consolidated Statements of Income and Comprehensive Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Interest income:
Interest and fees on loans, including loans held for sale	$128,457	$131,725	$137,653
Interest and dividends on securities:
Taxable	11,314	12,425	12,009
Tax exempt	2,576	2,249	2,074
Interest and dividends on Federal Reserve Bank and Federal Home Loan Bank stock	1,136	1,367	1,433
Other, including interest on federal funds sold	384	361	553
Total interest income	143,867	148,127	153,722
Interest expense:
Interest on deposits	9,798	11,313	17,911
Interest on repurchase agreements and other short-term borrowings	841	940	1,240
Interest on advances from Federal Home Loan Bank	27	26	34
Interest on long-term debt	1,131	1,161	2,403
Total interest expense	11,797	13,440	21,588
Net interest income	132,070	134,687	132,134
Provision for loan losses	8,755	8,568	9,450
Net interest income after provision for loan losses	123,315	126,119	122,684
Noninterest income:
Service charges on deposit accounts	23,892	24,650	23,996
Gains on sales of loans, net	1,468	3,098	2,562
Trust and wealth management income	9,011	8,199	6,918
Loan related fees	3,531	4,697	4,042
Bank owned life insurance	1,996	2,747	1,760
Brokerage revenue	2,454	2,245	2,209
Securities gains (losses)	-211	-45	1,155
Other noninterest income	2,940	3,713	3,315
Total noninterest income	45,081	49,304	45,957
Noninterest expense:
Officer salaries and employee benefits	11,076	10,432	10,561
Other salaries and employee benefits	43,417	42,411	41,327
Occupancy, net	8,017	7,804	7,546
Equipment	3,414	3,865	3,876
Data processing	7,877	7,308	6,394
Bank franchise tax	4,857	4,493	4,571
Legal fees	2,444	2,392	2,154
Professional fees	1,832	1,790	1,545
FDIC insurance	2,400	2,442	2,553
Other real estate owned provision and expense	3,897	5,154	5,267
Repossession expense	1,508	1,522	1,707
Other noninterest expense	15,260	20,638	16,053
Total noninterest expense	105,999	110,251	103,554
Income before income taxes	62,397	65,172	65,087
Income taxes	19,146	20,000	20,225
Net income	43,251	45,172	44,862
Unrealized holding gains (losses) on securities available-for-sale:
Unrealized holding gains (losses) arising during the period	13,928	-31,878	4,973
Less: Reclassification adjustments for realized (gains) losses included in net income	211	45	-1,155
Tax (benefit) expense	4,949	-11,142	1,336
Other comprehensive income (loss), net of tax	9,190	-20,691	2,482
Comprehensive income	$52,441	$24,481	$47,344
Basic earnings per share (in dollars per share)	$2.50	$2.63	$2.64
Diluted earnings per share (in dollars per share)	$2.49	$2.62	$2.63
Weighted average shares outstanding-basic (in shares)	17,326	17,158	17,013
Weighted average shares outstanding-diluted (in shares)	17,397	17,240	17,073
Dividends declared per share (in dollars per share)	$1.18	$1.15	$1.14

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Shareholders' Equity (USD $)	Common Stock [Member]	Capital Surplus [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss), Net of Tax	Total
In Thousands, except Share data, unless otherwise specified
Balance at Dec. 31, 2011	$77,151	$156,101	$123,431	$10,183	$366,866
Balance (in shares) at Dec. 31, 2011	16,972,994
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			44,862		44,862
Other comprehensive income (loss), net of tax				2,482	2,482
Cash dividends declared			-19,349		-19,349
Issuance of common stock	912	3,483			4,395
Issuance of common stock (in shares)	200,873
Issuance of restricted stock	2	-2			0
Issuance of restricted stock (shares)	364
Stock-based compensation and related excess tax benefits		1,088			1,088
Balance at Dec. 31, 2012	78,065	160,670	148,944	12,665	400,344
Balance (in shares) at Dec. 31, 2012	17,174,231
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			45,172		45,172
Other comprehensive income (loss), net of tax				-20,691	-20,691
Cash dividends declared			-19,827		-19,827
Issuance of common stock	1,038	5,310			6,348
Issuance of common stock (in shares)	228,260
Issuance of restricted stock	4	-4			0
Issuance of restricted stock (shares)	950
Stock-based compensation and related excess tax benefits		1,146			1,146
Balance at Dec. 31, 2013	79,107	167,122	174,289	-8,026	412,492
Balance (in shares) at Dec. 31, 2013	17,403,441				17,403,441
Increase (Decrease) in Stockholders' Equity [Roll forward]
Net income			43,251		43,251
Other comprehensive income (loss), net of tax				9,190	9,190
Cash dividends declared			-20,539		-20,539
Issuance of 10% stock dividend	7,910	44,394	-52,304		0
Issuance of common stock	346	1,646			1,992
Issuance of common stock (in shares)	69,138
Vesting of restricted stock	-45	45			0
Vesting of restricted stock (shares)	-8,945
Issuance of restricted stock	23	-23			0
Issuance of restricted stock (shares)	4,576
Forfeiture of restricted stock	-9	9			0
Forfeiture of restricted stock (shares)	-1,835
Stock-based compensation and related excess tax benefits		1,491			1,491
Balance at Dec. 31, 2014	$87,332	$214,684	$144,697	$1,164	$447,877
Balance (in shares) at Dec. 31, 2014	17,466,375				17,466,375

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Shareholders' Equity (Parenthetical) (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Increase (Decrease) in Stockholders' Equity [Roll forward]
Other comprehensive income (loss), tax	($4,949)	$11,142	($1,336)
Cash dividends declared (in dollars per share)	$1.18	$1.15	$1.14
Stock dividend rate (in hundredths)	10.00%

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income	$43,251	$45,172	$44,862
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	4,314	4,562	4,324
Deferred taxes	-1,048	582	5,441
Stock-based compensation	852	698	592
Excess tax benefits of stock-based compensation	760	572	496
Provision for loan losses	8,755	8,568	9,450
Write-downs of other real estate owned and other repossessed assets	1,730	2,480	2,704
Gains on sale of mortgage loans held for sale	-1,468	-3,098	-2,562
Securities (gains) losses	211	45	-1,155
(Gains)/losses on sale of assets, net	-73	-19	328
Proceeds from sale of mortgage loans held for sale	51,181	134,695	113,632
Funding of mortgage loans held for sale	-51,149	-109,939	-133,021
Amortization of securities premiums and discounts, net	2,661	3,976	5,375
Change in cash surrender value of bank owned life insurance	-1,506	-1,488	-1,410
Mortgage servicing rights:
Fair value adjustments	830	-206	559
New servicing assets created	-374	-854	-641
Changes in:
Other assets	-60	4,647	1,792
Other liabilities	-1,339	323	7,130
Net cash provided by operating activities	57,528	90,716	57,896
Certificates of deposit in other banks:
Purchase of certificates of deposit	-245	-4,472	0
Maturity of certificates of deposit	1,616	240	6,539
Securities available-for-sale (AFS):
Purchase of AFS securities	-217,949	-197,264	-285,795
Proceeds from sales of AFS securities	135,411	42,936	39,856
Proceeds from prepayments and maturities of AFS securities	63,023	112,412	169,592
Change in loans, net	-132,906	-76,442	-7,664
Purchase of premises and equipment	-2,081	-2,105	-4,301
Proceeds from sale of premises and equipment	82	48	108
Asset retirement	0	0	167
Redemption of stock by FHLB	7,746	0	0
Additional investment in Federal Reserve Bank stock	-1	-1	-2
Cancellation of Federal Reserve Bank stock	18	0	0
Proceeds from sale of other real estate owned and repossessed assets	6,714	9,914	11,082
Additional investment in other real estate owned and repossessed assets	0	-6	-545
Additional investment in bank owned life insurance	-5,504	-7,306	0
Net cash used in investing activities	-144,076	-122,046	-70,963
Cash flows from financing activities:
Change in deposits, net	19,183	-48,774	25,489
Change in repurchase agreements, federal funds purchased, and other short-term borrowings, net	25,695	-1,902	-7,847
Advances from Federal Home Loan Bank	60,000	30,000	0
Payments on advances from Federal Home Loan Bank	-116	-30,143	-20,180
Issuance of common stock	1,992	6,348	4,395
Excess tax benefits of stock-based compensation	-760	-572	-496
Dividends paid	-20,570	-24,546	-19,215
Net cash provided by (used in) financing activities	85,424	-69,589	-17,854
Net decrease in cash and cash equivalents	-1,124	-100,919	-30,921
Cash and cash equivalents at beginning of year	106,641	207,560	238,481
Cash and cash equivalents at end of year	105,517	106,641	207,560
Supplemental disclosures:
Income taxes paid	15,818	20,827	11,752
Interest paid	11,922	13,717	22,451
Non-cash activities:
Loans to facilitate the sale of other real estate owned and repossessed assets	6,168	3,528	7,768
Common stock dividends accrued, paid in subsequent quarter	216	167	4,887
Real estate acquired in settlement of loans	$12,199	$7,384	$12,031

Accounting_Policies

Accounting Policies	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Accounting Policies	1.  Accounting Policies
	Basis of Presentation – The consolidated financial statements include Community Trust Bancorp, Inc. ("CTBI") and its subsidiaries, including its principal subsidiary, Community Trust Bank, Inc. ("CTB").  Intercompany transactions and accounts have been eliminated in consolidation.
	Nature of Operations – Substantially all assets, liabilities, revenues, and expenses are related to banking operations, including lending, investing of funds, obtaining of deposits, trust and wealth management operations, full service brokerage operations, and other financing activities.  All of our business offices and the majority of our business are located in eastern, northeastern, central, and south central Kentucky, southern West Virginia, and northeastern Tennessee.
	Use of Estimates – In preparing the consolidated financial statements, management must make certain estimates and assumptions.  These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses, as well as affecting the disclosures provided.  Future results could differ from the current estimates.  Such estimates include, but are not limited to, the allowance for loan and lease losses, valuation of other real estate owned, fair value of securities and mortgage servicing rights, goodwill, and valuation of deferred tax assets.
	The accompanying financial statements have been prepared using values and information currently available to CTBI.
	Given the volatility of current economic conditions, the values of assets and liabilities recorded in the financial statements could change rapidly, resulting in material future adjustments in asset values, the allowance for loan and lease losses, and capital.
	Cash and Cash Equivalents – CTBI considers all liquid investments with original maturities of three months or less to be cash equivalents.  Cash and cash equivalents include cash on hand, amounts due from banks, interest bearing deposits in other financial institutions, and federal funds sold.  Generally, federal funds are sold for one-day periods.
	Certificates of Deposit in Other Banks – Certificates of deposit in other banks generally mature within 18 months and are carried at cost.
	Investments – Management determines the classification of securities at purchase.  We classify securities into held-to-maturity, trading, or available-for-sale categories.  Held-to-maturity securities are those which we have the positive intent and ability to hold to maturity and are reported at amortized cost.  In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 320, Investment Securities, investments in debt securities that are not classified as held-to-maturity and equity securities that have readily determinable fair values shall be classified in one of the following categories and measured at fair value in the statement of financial position:
	a. Trading securities. Securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) shall be classified as trading securities. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price.
	b. Available-for-sale securities. Investments not classified as trading securities (nor as held-to-maturity securities) shall be classified as available-for-sale securities.
	We do not have any securities that are classified as trading securities.  Available-for-sale securities are reported at fair value, with unrealized gains and losses included as a separate component of shareholders' equity, net of tax.  If declines in fair value are other than temporary, the carrying value of the securities is written down to fair value as a realized loss with a charge to income for the portion attributable to credit losses and a charge to other comprehensive income for the portion that is not credit related.
	Gains or losses on disposition of securities are computed by specific identification for all securities except for shares in mutual funds, which are computed by average cost.  Interest and dividend income, adjusted by amortization of purchase premium or discount, is included in earnings.
	When the fair value of a security is below its amortized cost, and depending on the length of time the condition exists and the extent the fair market value is below amortized cost, additional analysis is performed to determine whether an other than temporary impairment condition exists.  Available-for-sale and held-to-maturity securities are analyzed quarterly for possible other than temporary impairment.  The analysis considers (i) whether we have the intent to sell our securities prior to recovery and/or maturity and (ii) whether it is more likely than not that we will not have to sell our securities prior to recovery and/or maturity.  Often, the information available to conduct these assessments is limited and rapidly changing, making estimates of fair value subject to judgment.  If actual information or conditions are different than estimated, the extent of the impairment of the security may be different than previously estimated, which could have a material effect on the CTBI's results of operations and financial condition.
	Loans – Loans with the ability and the intent to be held until maturity and/or payoff are reported at the carrying value of unpaid principal reduced by unearned interest, an allowance for loan and lease losses, and unamortized deferred fees or costs.  Income is recorded on the level yield basis.  Interest accrual is discontinued when management believes, after considering economic and business conditions, collateral value, and collection efforts, that the borrower's financial condition is such that collection of interest is doubtful.  Any loan greater than 90 days past due must be well secured and in the process of collection to continue accruing interest.  Cash payments received on nonaccrual loans generally are applied against principal, and interest income is only recorded once principal recovery is reasonably assured.  Loans are not reclassified as accruing until principal and interest payments remain current for a period of time, generally six months, and future payments appear reasonably certain.  Included in certain loan categories of impaired loans are troubled debt restructurings that were classified as impaired.  A restructuring of a debt constitutes a troubled debt restructuring if the creditor for economic or legal reasons related to the debtor's financial difficulties grants a concession to the debtor that it would not otherwise consider.
	Loan origination and commitment fees and certain direct loan origination costs are deferred and the net amount amortized over the estimated life of the related loans, leases, or commitments as a yield adjustment.
	Allowance for Loan and Lease Losses – We maintain an allowance for loan and lease losses ("ALLL") at a level that is appropriate to cover estimated credit losses on individually evaluated loans determined to be impaired, as well as estimated credit losses inherent in the remainder of the loan and lease portfolio.  Since arriving at an appropriate ALLL involves a high degree of management judgment, we use an ongoing quarterly analysis to develop a range of estimated losses.  In accordance with accounting principles generally accepted in the United States, we use our best estimate within the range of potential credit loss to determine the appropriate ALLL.  Credit losses are charged and recoveries are credited to the ALLL.
	We utilize an internal risk grading system for commercial credits.  Those larger commercial credits that exhibit probable or observed credit weaknesses are subject to individual review.  The borrower's cash flow, adequacy of collateral coverage, and other options available to CTBI, including legal remedies, are evaluated.  The review of individual loans includes those loans that are impaired as defined by ASC 310-35, Impairment of a Loan.  We evaluate the collectability of both principal and interest when assessing the need for loss provision.  Historical loss rates are analyzed and applied to other commercial loans not subject to specific allocations.  The ALLL allocation for this pool of commercial loans is established based on the historical average, maximum, minimum, and median loss ratios.
	A loan is considered impaired when, based on current information and events, it is probable that CTBI will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement.  Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due.  Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired.  Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower's prior payment record, and the amount of the shortfall in relation to the principal and interest owed.  Impairment is measured on a loan-by-loan basis for commercial and construction loans by either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's obtainable market price, or the fair value of the collateral if the loan is collateral dependent.
	Homogenous loans, such as consumer installment, residential mortgages, and home equity lines are not individually risk graded.  The associated ALLL for these loans is measured under ASC 450, Contingencies.
	When any secured commercial loan is considered uncollectable, whether past due or not, a current assessment of the value of the underlying collateral is made.  If the balance of the loan exceeds the fair value of the collateral, the loan is placed on non-accrual and the loan is charged down to the value of the collateral less estimated cost to sell or a specific reserve equal to the difference between book value of the loan and the fair value assigned to the collateral is created until such time as the loan is foreclosed.  When the foreclosed collateral has been legally assigned to CTBI, a charge off is taken, if necessary, in order that the remaining balance reflects the fair value estimated less costs to sell of the collateral then transferred to other real estate owned or other repossessed assets.  When any unsecured commercial loan is considered uncollectable the loan is charged off no later than at 90 days past due.
	All closed-end consumer loans (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) are charged off no later than 120 days (5 monthly payments) delinquent.  If a loan is considered uncollectable, it is charged off earlier than 120 days delinquent.  For conventional 1-4 family residential loans and installment and revolving loans secured by real estate, when a loan is 90 days past due, a current assessment of the value of the real estate is made.  If the balance of the loan exceeds the fair value of the property, the loan is placed on nonaccrual.  Foreclosure proceedings are normally initiated after 120 days.  When the foreclosed property has been legally assigned to CTBI, the fair value less estimated costs to sell is transferred to other real estate owned and the remaining balance is taken as a charge-off.
	Historical loss rates for loans are adjusted for significant factors that, in management's judgment, reflect the impact of any current conditions on loss recognition.  We continue to use twelve rolling quarters for our historical loss rate analysis.  Factors that we consider include delinquency trends, current economic conditions and trends, strength of supervision and administration of the loan portfolio, levels of underperforming loans, level of recoveries to prior year's charge-offs, trends in loan losses, industry concentrations and their relative strengths, amount of unsecured loans, and underwriting exceptions.  Based upon management's judgment, "best case," "worst case," and "most likely" scenarios are determined.  The total of each of these weighted factors is then applied against the applicable portion of the portfolio and the ALLL is adjusted accordingly to approximate the most likely scenario.  Management continually reevaluates the other subjective factors included in its ALLL analysis.
	Loans Held for Sale – Mortgage loans originated and intended for sale in the secondary market are carried at the lower of cost or estimated market value in the aggregate.  Net unrealized losses, if any, are recognized by charges to income.  Gains and losses on loan sales are recorded in noninterest income.
	Premises and Equipment – Premises and equipment are stated at cost less accumulated depreciation and amortization.  Capital leases are included in premises and equipment at the capitalized amount less accumulated amortization.  Premises and equipment are evaluated for impairment on a quarterly basis.
	Depreciation and amortization are computed primarily using the straight-line method.  Estimated useful lives range up to 40 years for buildings, 2 to 10 years for furniture, fixtures, and equipment, and up to the lease term for leasehold improvements.  Capitalized leased assets are amortized on a straight-line basis over the lives of the respective leases.
	Federal Home Loan Bank and Federal Reserve Stock – CTB is a member of the Federal Home Loan Bank ("FHLB") system.  Members are required to own a certain amount of stock based on the level of borrowings and other factors and may invest on additional amounts.  FHLB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on the ultimate recovery par value.  Both cash and stock dividends are reported as income.
	CTB is also a member of its regional Federal Reserve Bank.  Federal Reserve Bank stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on the ultimate recovery par value.  Both cash and stock dividends are reported as income.
	Other Real Estate Owned – When foreclosed properties are acquired, appraisals are obtained and the properties are booked at the current market value less expected sales costs.  Additionally, periodic updated appraisals are obtained on unsold foreclosed properties.  When an updated appraisal reflects a market value below the current book value, a charge is booked to current earnings to reduce the property to its new market value less expected sales costs.  Our policy for determining the frequency of periodic reviews is based upon consideration of the specific properties and the known or perceived market fluctuations in a particular market and is typically between 12 and 18 months but generally not more than 24 months.  All revenues and expenses related to the carrying of other real estate owned are recognized by a charge to income.
	Goodwill and Core Deposit Intangible – We evaluate total goodwill and core deposit intangible for impairment, based upon ASC 350, Intangibles-Goodwill and Other, using fair value techniques including multiples of price/equity.  Goodwill and core deposit intangible are evaluated for impairment on an annual basis or as other events may warrant.
	The balance of goodwill, at $65.5 million, has not changed since January 1, 2012.  The activity to core deposit intangible for the years ended December 31, 2014, 2013, and 2012 is shown below.
	Core Deposit Intangible:
	(in thousands)	2014			2013			2012
	Beginning balance, January 1	$	690		$	904		$	1,117
	Amortization		(213	)		(214	)		(213	)
	Ending balance, December 31	$	477		$	690		$	904
	Amortization of core deposit intangible is estimated at approximately $0.2 million annually for years one and two and $0.1 million for year three, at which time core deposit intangible will be fully amortized.
	Transfers of Financial Assets -- Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered.  Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from CTBI—put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) CTBI does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
	Income Taxes – Income tax expense is based on the taxes due on the consolidated tax return plus deferred taxes based on the expected future tax benefits and consequences of temporary differences between carrying amounts and tax bases of assets and liabilities, using enacted tax rates.  Any interest and penalties incurred in connection with income taxes are recorded as a component of income tax expense in the consolidated financial statements.  During the years ended December 31, 2014, 2013, and 2012, CTBI has not recognized a significant amount of interest expense or penalties in connection with income taxes.
	Earnings Per Share ("EPS") – Basic EPS is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding, excluding restricted shares.
	Diluted EPS adjusts the number of weighted average shares of common stock outstanding by the dilutive effect of stock options, including restricted shares, as prescribed in ASC 718, Share-Based Payment.
	Segments – Management analyzes the operation of CTBI assuming one operating segment, community banking services.  CTBI, through its operating subsidiaries, offers a wide range of consumer and commercial community banking services.  These services include: (i) residential and commercial real estate loans; (ii) checking accounts; (iii) regular and term savings accounts and savings certificates; (iv) full service securities brokerage services; (v) consumer loans; (vi) debit cards; (vii) annuity and life insurance products; (viii) Individual Retirement Accounts and Keogh plans; (ix) commercial loans; (x) trust and wealth management services; and (xi) commercial demand deposit accounts.
	Bank Owned Life Insurance – CTBI's bank owned life insurance policies are carried at their cash surrender value.  We recognize tax-free income from the periodic increases in cash surrender value of these policies and from death benefits.
	Mortgage Servicing Rights – Mortgage servicing rights ("MSRs") are carried at fair market value following the accounting guidance in ASC 860-50, Servicing Assets and Liabilities.  MSRs are valued using Level 3 inputs as defined in ASC 820, Fair Value Measurements.  The fair value is determined quarterly based on an independent third-party valuation using a discounted cash flow analysis and calculated using a computer pricing model.  The system used in this evaluation, Compass Point, attempts to quantify loan level idiosyncratic risk by calculating a risk derived value.  As a result, each loan's unique characteristics determine the valuation assumptions ascribed to that loan.  Additionally, the computer valuation is based on key economic assumptions including the prepayment speeds of the underlying loans generated using the Andrew Davidson Prepayment Model, FHLMC/FNMA guidelines, the weighted-average life of the loan, the discount rate, the weighted-average coupon, and the weighted-average default rate, as applicable.  Along with the gains received from the sale of loans, fees are received for servicing loans.  These fees include late fees, which are recorded in interest income, and ancillary fees and monthly servicing fees, which are recorded in noninterest income.  Costs of servicing loans are charged to expense as incurred.  Changes in fair market value of the MSRs are reported as an increase or decrease to mortgage banking income.
	Share-Based Compensation – CTBI has a share-based employee compensation plan, which is described more fully in note 14 to the consolidated financial statements.  CTBI accounts for this plan under the recognition and measurement principles of ASC 718, Share-Based Payment.
	Comprehensive Income – Comprehensive income consists of net income and other comprehensive income, net of applicable income taxes.  Other comprehensive income includes unrealized appreciation (depreciation) on available-for-sale securities and unrealized appreciation (depreciation) on available-for-sale securities for which a portion of an other than temporary impairment has been recognized in income.
	Transfers between Fair Value Hierarchy Levels – Transfers in and out of Level 1 (quoted market prices), Level 2 (other significant observable inputs), and Level 3 (significant unobservable inputs) are recognized on the period ending date.
	Reclassifications – Certain reclassifications considered to be immaterial have been made in the prior year consolidated financial statements to conform to current year classifications.  These reclassifications had no effect on net income.
	On June 2, 2014, CTBI issued a 10% stock dividend to shareholders of record on May 15, 2014.  Based on the number of common shares outstanding on the record date, CTBI issued 1,582,137 new shares.  The fair market value of the additional shares issued, aggregating $52.3 million, was charged to retained earings, and common stock and additional paid-in capital were increased by $7.9 million and $44.4 million, respectively.  All references in the consolidated financial statements and accompanying footnotes to the number of common shares and per share amounts are based on the increased number of shares giving restrospective effect to the stock dividend.
	New Accounting Standards –
	Ø            Accounting for Investments in Qualified Affordable Housing Projects – In January 2014, the FASB issued ASU No. 2014-01, Investments—Equity Method and Joint Ventures (Topic 323):  Accounting for Investments in Qualified Affordable Housing Projects, which enables companies that invest in affordable housing projects that qualify for the low-income housing tax credit (LIHTC) to elect to use the proportional amortization method if certain conditions are met.  Under the proportional amortization method, the initial investment cost of the project is amortized in proportion to the amount of tax credits and benefits received, with the results of the investment presented on a net basis as a component of income tax expense (benefit).  ASU 2014-01 is effective for interim and annual periods beginning after December 15, 2014.  The adoption of this ASU is not expected to have a material impact on CTBI's consolidated financial statements.
	Ø            Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure – In January 2014, the FASB also issued ASU No. 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40):  Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate.  According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement.  ASU 2014-04 also clarifies that a creditor should not delay reclassification when a borrower has a legal right of redemption.  ASU 2014-04 is effective for interim and annual periods beginning after December 15, 2014.  The adoption of this ASU is not expected to have a material impact on CTBI's consolidated financial statements as our practice is already consistent with the new guidance.
	Ø            Elimination of Extraordinary Reporting – In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.  The FASB issued this ASU as part of its initiative to reduce complexity in accounting standards.  The objective of the simplification initiative is to identify, evaluate, and improve areas of U.S. GAAP for which cost and complexity can be reduced while maintaining or improving the usefulness of the information provided to the users of financial statements.  The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015.  A reporting entity may apply the amendments prospectively.  A reporting entity also may apply the amendments retrospectively to all prior periods presented in the financial statements.  Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption.  The effective date is the same for both public business entities and all other entities.  For an entity that prospectively applies the guidance, the only required transition disclosure will be to disclose, if applicable, both the nature and the amount of an item included in income from continuing operations after adoption that adjusts an extraordinary item previously classified and presented before the date of adoption.  An entity retrospectively applying the guidance should provide the disclosures in paragraphs 250-10-50-1 through 50-2.

Cash_and_Due_from_Banks_and_In

Cash and Due from Banks and Interest Bearing Deposits	12 Months Ended
	Dec. 31, 2014
Cash and Due from Banks and Interest Bearing Deposits [Abstract]
Cash and Due from Banks and Interest Bearing Deposits	2.  Cash and Due from Banks and Interest Bearing Deposits
	Included in cash and due from banks and interest bearing deposits are amounts required to be held at the Federal Reserve or maintained in vault cash in accordance with regulatory reserve requirements.  The balance requirements were $64.5 million and $60.0 million at December 31, 2014 and 2013, respectively.
	At December 31, 2014, CTBI had cash accounts which exceeded federally insured limits, and therefore are not subject to FDIC insurance, with $40.9 million in deposits with the Federal Reserve, $22.1 million in deposits with Fifth Third Bank, and $3.4 million in deposits with the Federal Home Loan Bank.

Securities

Securities	12 Months Ended
	Dec. 31, 2014
Securities [Abstract]
Securities	3.  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, 2014 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	$	190,563	$	509		$	(2,140	)	$	188,932
	State and political subdivisions		133,951		3,973			(466	)		137,458
	U.S. government sponsored agency mortgage-backed securities		288,881		2,876			(2,850	)		288,907
	Total debt securities		613,395		7,358			(5,456	)		615,297
	Marketable equity securities		25,000		0			(111	)		24,889
	Total available-for-sale securities	$	638,395	$	7,358		$	(5,567	)	$	640,186
	Held-to-Maturity
	(in thousands)	Amortized Cost		Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury and government agencies	$	480	$	0		$	(19	)	$	461
	State and political subdivisions		1,182		1			0			1,183
	Total held-to-maturity securities	$	1,662	$	1		$	(19	)	$	1,644
	The amortized cost and fair value of securities at December 31, 2013 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	$	77,838	$	277		$	(5,492	)	$	72,623
	State and political subdivisions		118,055		1,907			(3,259	)		116,703
	U.S. government sponsored agency mortgage-backed securities		370,860		4,273			(7,836	)		367,297
	Total debt securities		566,753		6,457			(16,587	)		556,623
	Marketable equity securities		55,000		0			(2,218	)		52,782
	Total available-for-sale securities	$	621,753	$	6,457		$	(18,805	)	$	609,405
	Held-to-Maturity
	(in thousands)	Amortized Cost		Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury and government agencies	$	480	$	0		$	(62	)	$	418
	State and political subdivisions		1,182		1			0			1,183
	Total held-to-maturity securities	$	1,662	$	1		$	(62	)	$	1,601
	The amortized cost and fair value of securities at December 31, 2014 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	$	9,153	$	9,193		$	0		$	0
	Due after one through five years		124,725		125,444			0			0
	Due after five through ten years		141,407		141,625			1,662			1,644
	Due after ten years		49,229		50,128			0			0
	U.S. government sponsored agency mortgage-backed securities		288,881		288,907			0			0
	Total debt securities		613,395		615,297			1,662			1,644
	Marketable equity securities		25,000		24,889			0			0
	Total securities	$	638,395	$	640,186		$	1,662		$	1,644
	There was a combined loss of $211 thousand realized in 2014. A pre-tax gain of $2.1 million and a pre-tax loss of $2.4 million were realized during the year.  There was a combined loss of $45 thousand realized in 2013 and a combined gain of $1.2 million realized in 2012.
	The amortized cost of securities pledged as collateral, to secure public deposits and for other purposes, was $267.1 million at December 31, 2014 and $257.5 million at December 31, 2013.
	The amortized cost of securities sold under agreements to repurchase amounted to $280.9 million at December 31, 2014 and $255.4 million at December 31, 2013.
	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, 2014 indicates that all impairment is considered temporary, market and interest rate driven, and not credit-related.  The percentage of total investments with unrealized losses as of December 31, 2014 was 44.1% compared to 67.8% as of December 31, 2013.  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, 2014 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	$	31,185	$	(87	)	$	31,098
	State and political subdivisions		8,800		(23	)		8,777
	U.S. government sponsored agency mortgage-backed securities		50,115		(442	)		49,673
	Total debt securities		90,100		(552	)		89,548
	Marketable equity securities		25,000		(111	)		24,889
	Total <12 months temporarily impaired AFS securities		115,100		(663	)		114,437
	12 Months or More
	U.S. Treasury and government agencies		65,209		(2,053	)		63,156
	State and political subdivisions		21,308		(443	)		20,865
	U.S. government sponsored agency mortgage-backed securities		86,389		(2,408	)		83,981
	Total debt securities		172,906		(4,904	)		168,002
	Marketable equity securities		0		0			0
	Total ≥12 months temporarily impaired AFS securities		172,906		(4,904	)		168,002
	Total
	U.S. Treasury and government agencies		96,394		(2,140	)		94,254
	State and political subdivisions		30,108		(466	)		29,642
U.S. government sponsored agency mortgage-backed securities		136,504		(2,850	)		133,654
Total debt securities		263,006		(5,456	)		257,550
Marketable equity securities		25,000		(111	)		24,889
Total temporarily impaired AFS securities	$	288,006	$	(5,567	)	$	282,439
Held-to-Maturity
(in thousands)	Amortized Cost		Gross Unrealized Losses			Fair Value
12 Months or More
U.S. Treasury and government agencies	$	480	$	(19	)	$	461
Total temporarily impaired HTM securities	$	480	$	(19	)	$	461
U.S. Treasury and Government Agencies
The unrealized losses in U.S. Treasury and government agencies were caused by interest rate increases.  The contractual terms of those investments do not permit the issuer to settle the securities at a price less than amortized cost.  CTBI does not consider those investments to be other-than-temporarily impaired at December 31, 2014, because CTBI does not intend to sell the investments and it is not more likely than not that we will be required to sell the investments before recovery of their amortized cost, which may be maturity.
State and Political Subdivisions
The unrealized losses in securities of state and political subdivisions were caused by interest rate increases.  The contractual terms of those investments do not permit the issuer to settle the securities at a price less than amortized cost.  CTBI does not consider those investments to be other-than-temporarily impaired at December 31, 2014, because CTBI does not intend to sell the investments before recovery of their amortized cost, which may be maturity.
U.S. Government Sponsored Agency Mortgage-Backed Securities
The unrealized losses in U.S. government sponsored agency mortgage-backed securities were caused by interest rate increases.  CTBI expects to recover the amortized cost basis over the term of the securities.  CTBI does not consider those investments to be other-than-temporarily impaired at December 31, 2014, because (i) the decline in market value is attributable to changes in interest rates and not credit quality, (ii) CTBI does not intend to sell the investments, and (iii) it is not more likely than not we will be required to sell the investments before recovery of their amortized cost, which may be maturity.
Marketable Equity Securities
CTBI's investments in marketable equity securities consist of investments in fixed income mutual funds ($24.9 million of the total fair value and $111 thousand of the total unrealized losses in common stock investments).  The severity of the impairment (fair value is approximately 0.4% less than cost) and the duration of the impairment correlates with the decline in long-term interest rates in 2014.  CTBI evaluated the near-term prospects of these funds in relation to the severity and duration of the impairment.  Based on that evaluation, CTBI does not consider those investments to be other-than-temporarily impaired at December 31, 2014.
The analysis performed as of December 31, 2013 indicated that all impairment was considered temporary, market and interest rate 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, 2013 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	$	31,631	$	(1,970	)	$	29,661
State and political subdivisions		57,165		(2,789	)		54,376
U.S. government sponsored agency mortgage-backed securities		238,824		(7,829	)		230,995
Total debt securities		327,620		(12,588	)		315,032
Marketable equity securities		55,000		(2,218	)		52,782
Total <12 months temporarily impaired AFS securities		382,620		(14,806	)		367,814
12 Months or More
U.S. Treasury and government agencies		35,750		(3,522	)		32,228
State and political subdivisions		7,639		(470	)		7,169
U.S. government sponsored agency mortgage-backed securities		6,579		(7	)		6,572
Total debt securities		49,968		(3,999	)		45,969
Marketable equity securities		0		0			0
Total ≥12 months temporarily impaired AFS securities		49,968		(3,999	)		45,969
Total
U.S. Treasury and government agencies		67,381		(5,492	)		61,889
State and political subdivisions		64,804		(3,259	)		61,545
U.S. government sponsored agency mortgage-backed securities		245,403		(7,836	)		237,567
Total debt securities		377,588		(16,587	)		361,001
Marketable equity securities		55,000		(2,218	)		52,782
Total temporarily impaired AFS securities	$	432,588	$	(18,805	)	$	413,783
Held-to-Maturity
(in thousands)	Amortized Cost		Gross Unrealized Losses			Fair Value
12 Months or More
U.S. Treasury and government agencies	$	480	$	(62	)	$	418
Total temporarily impaired HTM securities	$	480	$	(62	)	$	418

Loans

Loans	12 Months Ended
	Dec. 31, 2014
Loans [Abstract]
Loans	4.  Loans
	Major classifications of loans, net of unearned income, deferred loan origination costs, and net premiums on acquired loans, are summarized as follows:
			31-Dec		31-Dec
	(in thousands)		2014		2013
	Commercial construction		$	121,942	$	110,779
	Commercial secured by real estate			948,626		872,542
	Equipment lease financing			10,344		8,840
	Commercial other			352,048		374,881
	Real estate construction			62,412		56,075
	Real estate mortgage			712,465		697,601
	Home equity			88,335		84,880
	Consumer direct			122,136		122,215
	Consumer indirect			315,516		287,541
	Total loans		$	2,733,824	$	2,615,354
	CTBI has segregated and evaluates its loan portfolio through nine portfolio segments. CTBI serves customers in small and mid-sized communities in eastern, northeastern, central, and south central Kentucky, southern West Virginia, and northeastern Tennessee.  Therefore, CTBI's exposure to credit risk is significantly affected by changes in these communities.
	Commercial construction loans are for the purpose of erecting or rehabilitating buildings or other structures for commercial purposes, including any infrastructure necessary for development.   Included in this category are improved property, land development, and tract development loans.  The terms of these loans are generally short-term with permanent financing upon completion.
	Commercial real estate loans include loans secured by nonfarm, nonresidential properties, 1-4 family/multi-family properties, farmland, and other commercial real estate.  These loans are originated based on the borrower's ability to service the debt and secondarily based on the fair value of the underlying collateral.
	Equipment lease financing loans are fixed, variable, and tax exempt leases for commercial purposes.
	Commercial other loans consist of commercial check loans, agricultural loans, receivable financing, floorplans, loans to financial institutions, loans for purchasing or carrying securities, and other commercial purpose loans.  Commercial loans are underwritten based on the borrower's ability to service debt from the business's underlying cash flows.  As a general practice, we obtain collateral such as real estate, equipment, or other assets, although such loans may be uncollateralized but guaranteed.
	Real estate construction loans are typically for owner-occupied properties.  The terms of these loans are generally short-term with permanent financing upon completion.
	Residential real estate loans are a mixture of fixed rate and adjustable rate first and second lien residential mortgage loans.  As a policy, CTBI holds adjustable rate loans and sells the majority of its fixed rate first lien mortgage loans into the secondary market.  Changes in interest rates or market conditions may impact a borrower's ability to meet contractual principal and interest payments.  Residential real estate loans are secured by real property.
	Home equity lines are revolving adjustable rate credit lines secured by real property.
	Consumer direct loans are fixed rate products comprised of unsecured loans, consumer revolving credit lines, deposit secured loans, and all other consumer purpose loans.
	Consumer indirect loans are fixed rate loans secured by automobiles, trucks, vans, and recreational vehicles originated at the selling dealership underwritten and purchased by CTBI's indirect lending department.  Both new and used products are financed.  Only dealers who have executed dealer agreements with CTBI participate in the indirect lending program.
	Not included in the loan balances above were loans held for sale in the amount of $2.3 million at December 31, 2014 and $0.8 million at December 31, 2013.
	Refer to note 1 to the condensed consolidated financial statements for further information regarding our nonaccrual policy.  Nonaccrual loans segregated by class of loans were as follows:
	(in thousands)		31-Dec		31-Dec
			2014		2013
	Commercial:
	Commercial construction		$	4,339	$	4,519
	Commercial secured by real estate			6,725		6,576
	Commercial other			2,423		2,801
	Residential:
	Real estate construction			602		481
	Real estate mortgage			6,513		5,152
	Home equity			369		429
	Total nonaccrual loans		$	20,971	$	19,958
	The following tables present CTBI's loan portfolio aging analysis, segregated by class, as of December 31, 2014 and 2013:
			31-Dec-14
	(in thousands)		30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Past Due		Current		Total Loans		90+ and Accruing*
	Commercial:
	Commercial construction		$	40	$	31	$	6,171	$	6,242	$	115,700	$	121,942	$	1,863
	Commercial secured by real estate			2,471		1,595		10,763		14,829		933,797		948,626		4,682
	Equipment lease financing			0		0		0		0		10,344		10,344		0
	Commercial other			826		55		4,205		5,086		346,962		352,048		2,367
	Residential:
	Real estate construction			92		144		985		1,221		61,191		62,412		383
	Real estate mortgage			1,005		5,171		13,049		19,225		693,240		712,465		7,742
	Home equity			779		197		703		1,679		86,656		88,335		422
	Consumer:
	Consumer direct			1,307		295		141		1,743		120,393		122,136		141
	Consumer indirect			2,304		586		385		3,275		312,241		315,516		385
	Total		$	8,824	$	8,074	$	36,402	$	53,300	$	2,680,524	$	2,733,824	$	17,985
			31-Dec-13
	(in thousands)		30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Past Due		Current		Total Loans		90+ and Accruing*
	Commercial:
	Commercial construction		$	250	$	166	$	6,012	$	6,428	$	104,351	$	110,779	$	1,673
	Commercial secured by real estate			3,703		1,982		16,660		22,345		850,197		872,542		12,403
	Equipment lease financing			0		0		0		0		8,840		8,840		0
	Commercial other			344		422		6,156		6,922		367,959		374,881		3,723
	Residential:
	Real estate construction			81		383		694		1,158		54,917		56,075		213
	Real estate mortgage			1,274		4,419		9,346		15,039		682,562		697,601		4,847
	Home equity			786		330		737		1,853		83,027		84,880		324
Consumer:
Consumer direct			1,063		291		119		1,473		120,742		122,215		119
Consumer indirect			2,750		668		297		3,715		283,826		287,541		297
Total		$	10,251	$	8,661	$	40,021	$	58,933	$	2,556,421	$	2,615,354	$	23,599
*90+ and Accruing are also included in 90+ Days Past Due column.
The risk characteristics of CTBI's material portfolio segments are as follows:
Commercial construction loans generally are made to customers for the purpose of building income-producing properties.  Personal guarantees of the principals are generally required.  Such loans are made on a projected cash flow basis and are secured by the project being constructed.  Construction loan draw procedures are included in each specific loan agreement, including required documentation items and inspection requirements.  Construction loans may convert to term loans at the end of the construction period, or may be repaid by the take-out commitment from another financing source.  If the loan is to convert to a term loan, the repayment ability is based on the borrower's projected cash flow.  Risk is mitigated during the construction phase by requiring proper documentation and inspections whenever a draw is requested.  Loans in amounts greater that $500,000 generally require a performance bond to be posted by the general contractor to assure completion of the project.
Commercial real estate loans are viewed primarily as cash flow loans and secondarily as loans secured by real estate.  Commercial real estate lending typically involves higher loan principal amounts and the repayment of these loans is generally dependent on the successful operation of the property securing the loan or the business conducted on the property securing the loan.  Commercial real estate loans may be more adversely affected by conditions in the real estate markets or in the general economy.  Management monitors and evaluates commercial real estate loans based on collateral and risk grade criteria.
Equipment lease financing is underwritten by our commercial lenders using the same underwriting standards as would be applied to a secured commercial loan requesting 100% financing.  The pricing for equipment lease financing is comparable to that of borrowers with similar quality commercial credits with similar collateral.  Maximum terms of equipment leasing are determined by the type and expected life of the equipment to be leased.  Residual values are determined by appraisals or opinion letters from industry experts.  Leases must be in conformity with our consolidated annual tax plan.  As we underwrite our equipment lease financing in a manner similar to our commercial loan portfolio described below, the risk characteristics for this portfolio mirror that of the commercial loan portfolio.
Commercial loans are primarily based on the identified cash flows of the borrower and secondarily on the underlying collateral provided by the borrower.  The cash flows of borrowers, however, may not be as expected and the collateral securing these loans may fluctuate in value.  Most commercial loans are secured by the assets being financed or other business assets such as accounts receivable or inventory and may incorporate a personal guarantee; however, some short-term loans may be made on an unsecured basis.  In the case of loans secured by accounts receivable, the availability of funds for the repayment of these loans may be substantially dependent on the ability of the borrower to collect amounts due from its customers.
With respect to residential loans that are secured by 1-4 family residences and are generally owner occupied, CTBI generally establishes a maximum loan-to-value ratio and requires private mortgage insurance if that ratio is exceeded.  Home equity loans are typically secured by a subordinate interest in 1-4 family residences. Residential construction loans are handled through the home mortgage area of the bank.  The repayment ability of the borrower and the maximum loan-to-value ratio are calculated using the normal mortgage lending criteria.  Draws are processed based on percentage of completion stages including normal inspection procedures.  Such loans generally convert to term loans after the completion of construction.
Consumer loans are secured by consumer assets such as automobiles or recreational vehicles.  Some consumer loans are unsecured such as small installment loans and certain lines of credit.  Our determination of a borrower's ability to repay these loans is primarily dependent on the personal income and credit rating of the borrowers, which can be impacted by economic conditions in their market areas such as unemployment levels.  Repayment can also be impacted by changes in property values on residential properties.  Risk is mitigated by the fact that the loans are of smaller individual amounts and spread over a large number of borrowers.
The indirect lending area of the bank generally deals with purchasing/funding consumer contracts with new and used automobile dealers.  The dealers generate consumer loan applications which are forwarded to the indirect loan processing area for approval or denial.  Loan approvals or denials are based on the creditworthiness and repayment ability of the borrower, and on the collateral value.  The dealers may have recourse agreements with CTB.
Credit Quality Indicators:
CTBI categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors.  CTBI also considers the fair value of the underlying collateral and the strength and willingness of the guarantor(s).  CTBI analyzes commercial loans individually by classifying the loans as to credit risk.  Loans classified as loss, doubtful, substandard, or special mention are reviewed quarterly by CTBI for further deterioration or improvement to determine if appropriately classified and valued if deemed impaired.  All other commercial loan reviews are completed every 12 to 18 months.  In addition, during the renewal process of any loan, as well as if a loan becomes past due or if other information becomes available, CTBI will evaluate the loan grade.  CTBI uses the following definitions for risk ratings:
Ø	Pass grades include investment grade, low risk, moderate risk, and acceptable risk loans.  The loans range from loans that have no chance of resulting in a loss to loans that have a limited chance of resulting in a loss.  Customers in this grade have excellent to fair credit ratings.  The cash flows are adequate to meet required debt repayments.
Ø	Watch graded loans are loans that warrant extra management attention but are not currently criticized.  Loans on the watch list may be potential troubled credits or may warrant "watch" status for a reason not directly related to the asset quality of the credit.  The watch grade is a management tool to identify credits which may be candidates for future classification or may temporarily warrant extra management monitoring.
Ø	Other assets especially mentioned (OAEM) reflects loans that are currently protected but are potentially weak.  These loans constitute an undue and unwarranted credit risk but not to the point of justifying a classification of substandard.  The credit risk may be relatively minor yet constitute an unwarranted risk in light of circumstances surrounding a specific asset. Loans in this grade display potential weaknesses which may, if unchecked or uncorrected, inadequately protect CTBI's credit position at some future date.  The loans may be adversely affected by economic or market conditions.
Ø	Substandard grading indicates that the loan is inadequately protected by the current sound worth and paying capacity of the obligor or of the collateral pledged.  These loans have a well-defined weakness or weaknesses that jeopardize the orderly liquidation of the debt with the distinct possibility that CTBI will sustain some loss if the deficiencies are not corrected.
Ø	Doubtful graded loans have the weaknesses inherent in the substandard grading with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.  The probability of loss is extremely high, but because of certain important and reasonably specific pending factors which may work to CTBI's advantage or strengthen the asset(s), its classification as an estimated loss is deferred until its more exact status may be determined.  Pending factors include proposed merger, acquisition, or liquidation procedures, capital injection, perfecting liens on additional collateral, and refinancing plans.
The following tables present the credit risk profile of CTBI's commercial loan portfolio based on rating category and payment activity, segregated by class of loans, as of December 31, 2014 and 2013:
(in thousands)		Commercial Construction		Commercial Secured by Real Estate		Equipment Leases		Commercial Other		Total
31-Dec-14
Pass		$	101,314	$	834,751	$	10,344	$	307,270	$	1,253,679
Watch			9,857		69,123		0		36,114		115,094
OAEM			934		10,973		0		881		12,788
Substandard			5,647		27,901		0		5,772		39,320
Doubtful			4,190		5,878		0		2,011		12,079
Total		$	121,942	$	948,626	$	10,344	$	352,048	$	1,432,960
31-Dec-13
Pass		$	85,699	$	746,202	$	8,840	$	321,818	$	1,162,559
Watch			13,519		77,561		0		32,800		123,880
OAEM			0		6,639		0		6,200		12,839
Substandard			7,208		37,334		0		11,772		56,314
Doubtful			4,353		4,806		0		2,291		11,450
Total		$	110,779	$	872,542	$	8,840	$	374,881	$	1,367,042
The following tables present the credit risk profile of CTBI's residential real estate and consumer loan portfolios based on performing or nonperforming status, segregated by class, as of December 31, 2014 and 2013:
(in thousands)		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer		Total
										Indirect
31-Dec-14
Performing		$	61,427	$	698,210	$	87,544	$	121,995	$	315,131	$	1,284,307
Nonperforming (1)			985		14,255		791		141		385		16,557
Total		$	62,412	$	712,465	$	88,335	$	122,136	$	315,516	$	1,300,864
31-Dec-13
Performing		$	55,381	$	687,602	$	84,127	$	122,096	$	287,244	$	1,236,450
Nonperforming (1)			694		9,999		753		119		297		11,862
Total		$	56,075	$	697,601	$	84,880	$	122,215	$	287,541	$	1,248,312
(1)  A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.
A loan is considered impaired, in accordance with the impairment accounting guidance (ASC 310-10-35-16), when based on current information and events, it is probable CTBI will be unable to collect all amounts due from the borrower in accordance with the contractual terms of the loan.  Impaired loans include nonperforming commercial loans but also include loans modified in troubled debt restructurings where concessions have been granted to borrowers experiencing financial difficulties.  These concessions could include a reduction in the interest rate on the loan, payment extensions, forgiveness of principal, forbearance, or other actions intended to maximize collection.
The following table presents impaired loans, the average investment in impaired loans, and interest income recognized on impaired loans for the years ended December 31, 2014, 2013, and 2012:
		31-Dec-14
(in thousands)		Recorded Balance		Unpaid Contractual Principal Balance		Specific Allowance		Average Investment in Impaired Loans		*Interest Income Recognized
Loans without a specific valuation allowance:
Commercial construction		$	5,653	$	5,654	$	0	$	5,415	$	205
Commercial secured by real estate			31,639		33,268		0		34,650		1,180
Commercial other			13,069		14,597		0		15,663		783
Real estate mortgage			1,277		1,277		0		1,507		53
Loans with a specific valuation allowance:
Commercial construction			3,974		3,974		734		4,216		0
Commercial secured by real estate			2,718		2,876		827		4,376		11
Commercial other			738		862		181		531		1
Totals:
Commercial construction			9,627		9,628		734		9,631		205
Commercial secured by real estate			34,357		36,144		827		39,026		1,191
Commercial other			13,807		15,459		181		16,194		784
Real estate mortgage			1,277		1,277		0		1,507		53
Total		$	59,068	$	62,508	$	1,742	$	66,358	$	2,233
		31-Dec-13
(in thousands)		Recorded Balance		Unpaid Contractual Principal Balance		Specific Allowance		Average Investment in Impaired Loans		*Interest Income Recognized
Loans without a specific valuation allowance:
Commercial construction		$	5,457	$	5,458	$	0	$	5,595	$	240
Commercial secured by real estate			35,258		36,173		0		32,472		1,231
Commercial other			14,839		16,435		0		15,396		568
Real estate mortgage			1,024		1,024		0		934		43
Loans with a specific valuation allowance:
Commercial construction			4,353		4,359		1,189		4,935		0
Commercial secured by real estate			4,039		4,326		1,005		5,033		1
Commercial other			330		453		102		525		0
Totals:
Commercial construction			9,810		9,817		1,189		10,530		240
Commercial secured by real estate			39,297		40,499		1,005		37,505		1,232
Commercial other			15,169		16,888		102		15,921		568
Real estate mortgage			1,024		1,024		0		934		43
Total		$	65,300	$	68,228	$	2,296	$	64,890	$	2,083
		31-Dec-12
(in thousands)		Recorded Balance		Unpaid Contractual Principal Balance		Specific Allowance		Average Investment in Impaired Loans		*Interest Income Recognized
Loans without a specific valuation allowance:
Commercial construction		$	3,692	$	4,146	$	0	$	4,249	$	97
Commercial secured by real estate			35,046		35,818		0		35,542		1,337
Commercial other			13,285		15,484		0		11,083		416
Real estate mortgage			695		695		0		481		30
Loans with a specific valuation allowance:
Commercial construction			5,703		6,933		1,820		6,585		0
Commercial secured by real estate			3,067		3,189		1,090		3,243		0
Commercial other			1,010		2,331		338		1,441		0
Commercial construction			9,395		11,079		1,820		10,834		97
Commercial secured by real estate			38,113		39,007		1,090		38,785		1,337
Commercial other			14,295		17,815		338		12,524		416
Real estate mortgage			695		695		0		481		30
Total		$	62,498	$	68,596	$	3,248	$	62,624	$	1,880
*Cash basis interest is substantially the same as interest income recognized.
Included in certain loan categories of impaired loans are certain loans and leases that have been modified in a troubled debt restructuring, where economic concessions have been granted to borrowers who have experienced financial difficulties. These concessions typically result from our loss mitigation activities and could include reductions in the interest rate, payment extensions, forgiveness of principal, forbearance or other actions.  Modifications of terms for our loans and their inclusion as troubled debt restructurings are based on individual facts and circumstances.  Loan modifications that are included as troubled debt restructurings may involve either an increase or reduction of the interest rate, extension of the term of the loan, or deferral of principal and/or interest payments, regardless of the period of the modification.  All of the loans identified as troubled debt restructuring were modified due to financial stress of the borrower.  In order to determine if a borrower is experiencing financial difficulty, an evaluation is performed to determine the probability that the borrower will be in payment default on any of its debt in the foreseeable future with the modification.  This evaluation is performed under CTBI's internal underwriting policy.
When we modify loans and leases in a troubled debt restructuring, we evaluate any possible impairment similar to other impaired loans based on the present value of expected future cash flows, discounted at the contractual interest rate of the original loan or lease agreement, or use the current fair value of the collateral, less selling costs for collateral dependent loans. If we determined that the value of the modified loan is less than the recorded investment in the loan (net of previous charge-offs, deferred loan fees or costs and unamortized premium or discount), impairment is recognized through an allowance estimate or a charge-off to the allowance. In periods subsequent to modification, we evaluate all troubled debt restructuring, including those that have payment defaults, for possible impairment and recognize impairment through the allowance.
During 2014, certain loans were modified in troubled debt restructurings, where economic concessions were granted to borrowers consisting of reductions in the interest rates, payment extensions, forgiveness of principal, and forbearances.  Presented below, segregated by class of loans, are troubled debt restructurings that occurred during the years ended December 31, 2014 and 2013:
		Year Ended
		31-Dec-14
(in thousands)		Number of Loans		Term Modification		Rate Modification		Combination		Post-Modification Outstanding Balance
Commercial:
Commercial construction			1	$	7	$	0	$	0	$	7
Commercial secured by real estate			11		5,707		0		68		5,775
Commercial other			8		1,268		0		0		1,268
Residential:
Real estate mortgage			2		0		0		848		848
Total troubled debt restructurings			22	$	6,982	$	0	$	916	$	7,898
		Year Ended
		31-Dec-13
(in thousands)		Number of Loans		Term Modification		Rate Modification		Combination		Post-Modification Outstanding Balance
Commercial:
Commercial construction			6	$	2,603	$	0	$	0	$	2,603
Commercial secured by real estate			27		2,568		0		2,920		5,488
Commercial other			30		6,471		0		152		6,623
Residential:
Real estate mortgage			1		373		0		0		373
Total troubled debt restructurings			64	$	12,015	$	0	$	3,072	$	15,087
No charge-offs have resulted from modifications for any of the presented periods.  We have commitments to extend additional credit in the amount of $0.1 million on loans that are considered troubled debt restructurings.
Loans retain their accrual status at the time of their modification. As a result, if a loan is on nonaccrual at the time it is modified, it stays as nonaccrual, and if a loan is on accrual at the time of the modification, it generally stays on accrual.  Commercial and consumer loans modified in a troubled debt restructuring are closely monitored for delinquency as an early indicator of possible future default.  If loans modified in a troubled debt restructuring subsequently default, CTBI evaluates the loan for possible further impairment.  The allowance for loan and lease losses may be increased, adjustments may be made in the allocation of the allowance, or partial charge-offs may be taken to further write-down the carrying value of the loan.  Presented below, segregated by class of loans, are loans that were modified as troubled debt restructurings within the past twelve months which have subsequently defaulted.  CTBI considers a loan in default when it is 90 days or more past due or transferred to nonaccrual.
(in thousands)		Year Ended
		31-Dec-14
		Number of Loans		Recorded Balance
Commercial:
Commercial other			1		88
Residential:
Real estate mortgage			1		581
Total defaulted restructured loans			2	$	669
(in thousands)		Year Ended
		31-Dec-13
		Number of Loans		Recorded Balance
Commercial:
Commercial secured by real estate			2	$	89
Commercial other			6		596
Residential:
Real estate mortgage			1		373
Total defaulted restructured loans			9	$	1,058

Mortgage_Banking_and_Servicing

Mortgage Banking and Servicing Rights	12 Months Ended
	Dec. 31, 2014
Mortgage Banking and Servicing Rights [Abstract]
Mortgage Banking and Servicing Rights	5.  Mortgage Banking and Servicing Rights
	Mortgage banking activities primarily include residential mortgage originations and servicing.  As discussed in note 1 above, mortgage servicing rights ("MSRs") are carried at fair market value.  The fair value is determined quarterly based on an independent third-party valuation using a discounted cash flow analysis and calculated using a computer pricing model.  The system used in this evaluation, Compass Point, attempts to quantify loan level idiosyncratic risk by calculating a risk derived value.  As a result, each loan's unique characteristics determine the valuation assumptions ascribed to that loan.  Additionally, the computer valuation is based on key economic assumptions including the prepayment speeds of the underlying loans generated using the Andrew Davidson Prepayment Model, FHLMC/FNMA guidelines, the weighted-average life of the loan, the discount rate, the weighted-average coupon, and the weighted-average default rate, as applicable.  Along with the gains received from the sale of loans, fees are received for servicing loans.  These fees include late fees, which are recorded in interest income, and ancillary fees and monthly servicing fees, which are recorded in noninterest income.  Costs of servicing loans are charged to expense as incurred.  Changes in fair market value of the MSRs are reported as an increase or decrease to mortgage banking income.
	The following table presents the components of mortgage banking income:
	(in thousands)		2014			2013			2012
	Year Ended December 31
	Net gain on sale of loans held for sale		$	1,468		$	3,098		$	2,562
	Net loan servicing income (expense)
	Servicing fees			1,129			1,121			1,083
	Late fees			112			98			83
	Ancillary fees			149			368			382
	Fair value adjustments			(830	)		206			(559	)
	Net loan servicing income			560			1,793			989
	Mortgage banking income		$	2,028		$	4,891		$	3,551
	Mortgage loans serviced for others are not included in the accompanying balance sheets.  Loans serviced for the benefit of others (primarily FHLMC) totaled $441 million, $456 million, and $419 million at December 31, 2014, 2013 and 2012, respectively.  Servicing loans for others generally consists of collecting mortgage payments, maintaining escrow accounts, disbursing payments to investors, and processing foreclosures.  Custodial escrow balances maintained in connection with the foregoing loan servicing, and included in demand deposits, were approximately $888 thousand, $855 thousand, and $673 thousand at December 31, 2014, 2013, and 2012, respectively.
	Activity for capitalized mortgage servicing rights using the fair value method is as follows:
	(in thousands)		2014			2013			2012
	Fair value of MSRs, beginning of period		$	3,424		$	2,364		$	2,282
	New servicing assets created			374			854			641
	Change in fair value during the period due to:
	Time decay (1)			(162	)		(159	)		(116	)
	Payoffs (2)			(202	)		(423	)		(478	)
	Changes in valuation inputs or assumptions (3)			(466	)		788			35
	Fair value of MSRs, end of period		$	2,968		$	3,424		$	2,364
	-1	Represents decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.
	-2	Represents decrease in value due to loans that paid off during the period.
	-3	Represents change in value resulting from market-driven changes in interest rates.
	The fair values of capitalized mortgage servicing rights were $3.0 million, $3.4 million, and $2.4 million at December 31, 2014, 2013, and 2012, respectively.  Fair values were determined by third-party valuations using a discount rate of 10.1%, 10.0%, and 10.5%, for the years ended December 31, 2014, 2013, and 2012, respectively, and weighted average default rates of 3.61%, 3.36%, and 2.65%, respectively.  Prepayment speeds generated using the Andrew Davidson Prepayment Model averaged 11.3%, 9.7%, and 16.3% at December 31, 2014, 2013, and 2012, respectively.  These assumptions are prepared by the third party provider and reviewed and approved by management prior to final determination of the fair value.  MSR values are very sensitive to movement in interest rates as expected future net servicing income depends on the projected balance of the underlying loans, which can be greatly impacted by the level of prepayments.  CTBI does not currently hedge against changes in the fair value of its MSR portfolio.

Related_Party_Transactions

Related Party Transactions	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Related Party Transactions	6.  Related Party Transactions
	In the ordinary course of business, CTB has made extensions of credit and had transactions with certain directors and executive officers of CTBI or our subsidiaries, including their associates (as defined by the Securities and Exchange Commission).  We believe such extensions of credit and transactions were made on substantially the same terms, including interest rate and collateral, as those prevailing at the same time for comparable transactions with other persons.
	Activity for related party extensions of credit during 2014 and 2013 is as follows:
	(in thousands)	2014			2013
	Related party extensions of credit, beginning of period	$	33,103		$	33,038
	New loans and advances on lines of credit		5,500			8,305
	Repayments		(1,281	)		(8,237	)
	Increase (decrease) due to changes in related parties		151			(3	)
	Related party extensions of credit, end of period	$	37,473		$	33,103
	The aggregate balances of related party deposits at December 31, 2014 and 2013 were $12.4 million and $13.3 million, respectively.
	A director of CTBI, is a shareholder in a law firm that provided services to CTBI and its subsidiaries during the years 2014, 2013, and 2012.  Approximately $1.0 million in legal fees and $0.1 million in expenses paid on behalf of CTBI, $1.1 million total, were paid to this law firm during 2014.  Approximately $1.1 million in legal fees and $0.2 million in expenses, $1.3 million total, were paid during 2013, and approximately $1.3 million in legal fees and $0.2 million in expenses, $1.5 million in total, were paid during 2012.

Allowance_for_Loan_and_Lease_L

Allowance for Loan and Lease Losses	12 Months Ended
	Dec. 31, 2014
Allowance for Loan and Lease Losses [Abstract]
Allowance for Loan and Lease Losses	7.  Allowance for Loan and Lease Losses
	The following tables present the balance in the allowance for loan and lease losses ("ALLL") and the recorded investment in loans based on portfolio segment and impairment method as of December 31, 2014, 2013, and 2012:
	2014
	(in thousands)	Commercial Construction			Commercial Secured by Real Estate		Equipment Lease Financing			Commercial Other		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer Indirect			Total
	ALLL
	Balance, beginning of year	$	3,396		$	14,535	$	121		$	5,238	$	397	$	4,939	$	601	$	1,127	$	3,654		$	34,008
	Provision charged to expense		(513	)		941		(2	)		1,545		258		2,173		265		1,207		2,881			8,755
	Losses charged off		15			2,163		0			3,141		123		1,058		115		1,326		3,495			11,436
	Recoveries		28			305		0			621		2		40		5		566		1,553			3,120
	Balance, end of year	$	2,896		$	13,618	$	119		$	4,263	$	534	$	6,094	$	756	$	1,574	$	4,593		$	34,447
	Ending balance:
	Individually evaluated for impairment	$	734		$	827	$	0		$	181	$	0	$	0	$	0	$	0	$	0		$	1,742
	Collectively evaluated for impairment	$	2,162		$	12,791	$	119		$	4,082	$	534	$	6,094	$	756	$	1,574	$	4,593		$	32,705
	Loans
	Ending balance:
	Individually evaluated for impairment	$	9,627		$	34,357	$	0		$	13,807	$	0	$	1,277	$	0	$	0	$	0		$	59,068
	Collectively evaluated for impairment	$	112,315		$	914,269	$	10,344		$	338,241	$	62,412	$	711,188	$	88,335	$	122,136	$	315,516		$	2,674,756
	2013
	(in thousands)	Commercial Construction			Commercial Secured by Real Estate		Equipment Lease Financing			Commercial Other		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer Indirect			Total
	ALLL
	Balance, beginning of year	$	4,033		$	13,541	$	126		$	5,469	$	376	$	4,767	$	563	$	1,102	$	3,268		$	33,245
	Provision charged to expense		189			2,438		(5	)		1,477		106		860		268		696		2,539			8,568
	Losses charged off		1,135			1,607		0			2,265		89		744		241		1,166		3,802			11,049
	Recoveries		309			163		0			557		4		56		11		495		1,649			3,244
	Balance, end of year	$	3,396		$	14,535	$	121		$	5,238	$	397	$	4,939	$	601	$	1,127	$	3,654		$	34,008
	Ending balance:
	Individually evaluated for impairment	$	1,189		$	1,005	$	0		$	102	$	0	$	0	$	0	$	0	$	0		$	2,296
	Collectively evaluated for impairment	$	2,207		$	13,530	$	121		$	5,136	$	397	$	4,939	$	601	$	1,127	$	3,654		$	31,712
	Loans
	Ending balance:
	Individually evaluated for impairment	$	9,810		$	39,297	$	0		$	15,169	$	0	$	1,024	$	0	$	0	$	0		$	65,300
	Collectively evaluated for impairment	$	100,969		$	833,245	$	8,840		$	359,712	$	56,075	$	696,577	$	84,880	$	122,215	$	287,541		$	2,550,054
	2012
	(in thousands)	Commercial Construction			Commercial Secured by Real Estate		Equipment Lease Financing			Commercial Other		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer Indirect			Total
	ALLL
	Balance, beginning of year	$	4,023		$	11,753	$	112		$	5,608	$	354	$	4,302	$	562	$	917	$	5,540		$	33,171
	Provision charged to expense		1,009			3,520		14			2,330		183		1,437		238		892		(173	)		9,450
	Losses charged off		1,034			2,035		0			3,233		189		1,123		248		1,245		3,483			12,590
	Recoveries		35			303		0			764		28		151		11		538		1,384			3,214
	Balance, end of year	$	4,033		$	13,541	$	126		$	5,469	$	376	$	4,767	$	563	$	1,102	$	3,268		$	33,245
	Ending balance:
	Individually evaluated for impairment	$	1,820		$	1,090	$	0		$	338	$	0	$	0	$	0	$	0	$	0		$	3,248
	Collectively evaluated for impairment	$	2,213		$	12,451	$	126		$	5,131	$	376	$	4,767	$	563	$	1,102	$	3,268		$	29,997
	Loans
	Ending balance:
	Individually evaluated for impairment	$	9,395		$	38,113	$	0		$	14,295	$	0	$	695	$	0	$	0	$	0		$	62,498
	Collectively evaluated for impairment	$	110,052		$	769,100	$	9,246		$	362,053	$	55,041	$	696,233	$	82,292	$	122,581	$	281,477		$	2,488,075

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2014
Premises and Equipment [Abstract]
Premises and Equipment	8.  Premises and Equipment
	Premises and equipment are summarized as follows:
	(in thousands)	2014			2013
	31-Dec
	Land and buildings	$	76,795		$	76,313
	Leasehold improvements		4,760			4,778
	Furniture, fixtures, and equipment		34,234			32,237
	Construction in progress		227			971
	Total premises and equipment		116,016			114,299
	Less accumulated depreciation and amortization		(66,036	)		(62,299	)
	Premises and equipment, net	$	49,980		$	52,000
	Depreciation and amortization of premises and equipment for 2014, 2013, and 2012 was $4.1 million, $4.3 million, and $4.1 million, respectively.

Other_Real_Estate_Owned

Other Real Estate Owned	12 Months Ended
	Dec. 31, 2014
Other Real Estate Owned [Abstract]
Other Real Estate Owned	9.  Other Real Estate Owned
	Activity for other real estate owned was as follows:
	(in thousands)	2014			2013
	Beginning balance of other real estate owned	$	39,188		$	47,537
	New assets acquired		12,199			7,429
	Capitalized costs		0			6
	Fair value adjustments		(1,730	)		(2,480	)
	Sale of assets		(12,881	)		(13,304	)
	Ending balance of other real estate owned	$	36,776		$	39,188
	Carrying costs and fair value adjustments associated with foreclosed properties were $3.9 million, $5.2 million, and $5.3 million for 2014, 2013, and 2012, respectively.  See note 1 for a description of our accounting policies relative to foreclosed properties and other real estate owned.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Deposits	10.  Deposits
	Major classifications of deposits are categorized as follows:
	(in thousands)	2014		2013
	31-Dec
	Noninterest bearing deposits	$	677,626	$	621,321
	NOW accounts		31,998		31,017
	Money market deposits		577,677		554,072
	Savings		348,038		320,835
	Certificates of deposit and other time deposits of $100,000 or more		619,887		660,016
	Certificates of deposit and other time deposits less than $100,000		619,031		667,813
	Total deposits	$	2,874,257	$	2,855,074
	Interest expense on deposits is categorized as follows:
	(in thousands)	2014		2013		2012
	Savings, NOW, and money market accounts	$	2,141	$	2,281	$	2,894
	Certificates of deposit and other time deposits of $100,000 or more		4,265		4,863		7,378
	Certificates of deposit and other time deposits less than $100,000		3,392		4,169		7,639
	Total interest expense on deposits	$	9,798	$	11,313	$	17,911
	Maturities of certificates of deposits and other time deposits are presented below:
		Maturities by Period at December 31, 2014
	(in thousands)	Total		Within 1 Year		2 Years		3 Years		4 Years		5 Years		After 5 Years
	Certificates of deposit and other time deposits of $100,000 or more	$	619,887	$	518,045	$	48,833	$	24,280	$	14,070	$	14,559	$	100
	Certificates of deposit and other time deposits less than $100,000		619,031		536,074		40,225		18,219		12,894		11,275		344
	Total maturities	$	1,238,918	$	1,054,119	$	89,058	$	42,499	$	26,964	$	25,834	$	444

Advances_from_Federal_Home_Loa

Advances from Federal Home Loan Bank	12 Months Ended
	Dec. 31, 2014
Advances from Federal Home Loan Bank [Abstract]
Advances from Federal Home Loan Bank	11.  Advances from Federal Home Loan Bank
	Federal Home Loan Bank advances consisted of the following monthly amortizing and term borrowings at December 31:
	(in thousands)	2014		2013
	Monthly amortizing	$	1,170	$	1,286
	Term		60,000		0
	Total FHLB advances	$	61,170	$	1,286
	The advances from the FHLB that require monthly principal payments were due for repayment as follows:
		Principal Payments Due by Period at December 31, 2014
	(in thousands)	Total		Within 1 Year		2 Years		3 Years		4 Years		5 Years		After 5 Years
	Outstanding advances, weighted average interest rate – 1.70%	$	1,170	$	123	$	111	$	98	$	404	$	20	$	414
	At December 31, 2013, CTBI had monthly amortizing FHLB advances totaling $1.3 million at a weighted average interest rate of 1.84%.
	The term advances that require the total payment to be made at maturity follow:
	(in thousands)	2014		2013
	31-Dec
	Advance #275, 0.17%, due 1/05/15	$	60,000	$	0
	Total term advances	$	60,000	$	0
	Advances totaling $61.2 million at December 31, 2014 were collateralized by FHLB stock of $17.9 million and a blanket lien on qualifying first mortgage loans.  As of December 31, 2014, CTBI had a $483.0 million FHLB borrowing capacity with $61.2 million in advances and $109.5 million in letters of credit used for public fund pledging leaving $312.3 million available for additional advances.  The advances had fixed interest rates ranging from 0.00% to 6.42% with a weighted average rate of 0.20%.  The advances are subject to restrictions or penalties in the event of prepayment.  Advance #275 matured and was replaced with advances #279 and #280 with a weighted average interest rate of 0.17% maturing on February 3, 2015 totaling $80 million.  There were no term advances at December 31, 2013.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2014
Borrowings [Abstract]
Borrowings	12.  Borrowings
	Short-term debt is categorized as follows:
	(in thousands)	2014		2013
	31-Dec
	Repurchase agreements	$	235,186	$	208,067
	Federal funds purchased		11,041		12,465
	Total short-term debt	$	246,227	$	220,532
	All federal funds purchased and the majority of repurchase agreements mature and reprice daily.  The average rates paid for federal funds purchased and repurchase agreements on December 31, 2014 were 0.15% and 0.36%, respectively.
	The maximum balance for repurchase agreements at any month-end during 2014 occurred at November 30, 2014, with a month-end balance of $252.3 million.  The average balance of repurchase agreements for the year was $221.2 million.
	Long-term debt is categorized as follows:
	(in thousands)	2014		2013
	31-Dec
	Junior subordinated debentures, 1.83%, due 6/1/37	$	61,341	$	61,341
	On March 31, 2007, CTBI issued $61.3 million in junior subordinated debentures to a newly formed unconsolidated Delaware statutory trust subsidiary which in turn issued $59.5 million of capital securities in a private placement to institutional investors.  The debentures, which mature in 30 years but are redeemable at par at CTBI's option after five years, were issued at a rate of 6.52% until June 1, 2012, and thereafter at a floating rate based on the three-month LIBOR plus 1.59%.  The underlying capital securities were issued at the equivalent rates and terms.  The proceeds of the debentures were used to fund the redemption on April 2, 2007 of all CTBI's outstanding 9.0% and 8.25% junior subordinated debentures in the total amount of $61.3 million.
	On November 26, 2014, the coupon rate was set at 1.83% for the March 2, 2015 distribution date, which was based on the three-month LIBOR rate as of November 26, 2014 of 0.24% plus 1.59%.
	On October 31, 2014, Community Trust Bancorp, Inc. entered into a revolving credit promissory note for a line of credit in the amount of $12 million at a floating interest rate of 2.00% in excess of the one-month LIBOR Rate, with an unused commitment fee of 0.15%.  Currently, all $12 million remain available for general corporate purposes.  The agreement, which was effective October 31, 2014, replaced the agreement dated October 25, 2013, and will mature on October 30, 2015.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2014
Income Taxes [Abstract]
Income Taxes	13.  Income Taxes
	The components of the provision for income taxes, exclusive of tax effect of unrealized securities gains and losses, are as follows:
	(in thousands)	2014			2013			2012
	Current income tax expense	$	20,194		$	19,418		$	14,784
	Deferred income tax expense (benefit)		(1,048	)		582			5,441
	Total income tax expense	$	19,146		$	20,000		$	20,225
	A reconciliation of income tax expense at the statutory rate to our actual income tax expense is shown below:
	(in thousands)	2014						2013					2012
	Computed at the statutory rate	$	21,839			35	%	$	22,810		35	%	$	22,781		35	%
	Adjustments resulting from:
	Tax-exempt interest		(1,204	)		(1.93	)		(1,126	)	(1.73	)		(1,278	)	(1.96	)
	Housing and new markets credits		(1,076	)		(1.72	)		(996	)	(1.52	)		(704	)	(1.08	)
	Dividends received deduction		(178	)		(0.29	)		(291	)	(0.45	)		(202	)	(0.31	)
	Bank owned life insurance		(503	)		(0.81	)		(791	)	(1.22	)		(470	)	(0.72	)
	ESOP dividend deduction		(284	)		(0.46	)		(281	)	(0.43	)		(271	)	(0.42	)
	Other, net		552			0.88			675		1.04			369		0.56
	Total	$	19,146			30.68	%	$	20,000		30.69	%	$	20,225		31.07	%
	The components of the net deferred tax liability as of December 31 are as follows:
	(in thousands)	2014			2013
	Deferred tax assets:
	Allowance for loan and lease losses	$	12,019		$	11,820
	Interest on nonperforming loans		1,039			732
	Accrued expenses		1,911			3,370
	Allowance for other real estate owned		1,901			2,232
	Unrealized losses on AFS securities		0			3,717
	Other		1,145			232
	Total deferred tax assets		18,015			22,103
	Deferred tax liabilities:
	Depreciation and amortization		(19,181	)		(18,717	)
	FHLB stock dividends		(3,460	)		(4,956	)
	Loan fee income		(744	)		(724	)
	Mortgage servicing rights		(1,039	)		(1,198	)
	Capitalized lease obligations		(681	)		(1,145	)
	Unrealized gains on AFS securities		(1,231	)		0
	Other		(1,171	)		(1,015	)
	Total deferred tax liabilities		(27,507	)		(27,755	)
	Net deferred tax liability	$	(9,492	)	$	(5,652	)
	CTBI accounts for income taxes in accordance with income tax accounting guidance (ASC 740, Income Taxes).  The income tax accounting guidance results in two components of income tax expense:  current and deferred.  Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues.  CTBI determines deferred income taxes using the liability (or balance sheet) method.  Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur.  Deferred income tax expense results from changes in deferred tax assets and liabilities between periods.  Deferred tax assets are reduced by a valuation allowance if, based on the weight of evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized.
	Uncertain tax positions are recognized if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination.  The term more likely than not means a likelihood of more than 50 percent; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any.  A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50 percent likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information.  The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management's judgment.
	With a few exceptions, CTBI is no longer subject to U.S. federal tax examinations by tax authorities for years before 2010, and state and local income tax examinations by tax authorities for years before 2010.  For federal tax purposes, CTBI recognizes interest and penalties on income taxes as a component of income tax expense.
	CTBI files consolidated income tax returns with its subsidiaries.

Employee_Benefits

Employee Benefits	12 Months Ended
	Dec. 31, 2014
Employee Benefits [Abstract]
Employee Benefits	14.  Employee Benefits
	CTBI maintains two separate retirement savings plans, a 401(k) Plan and an Employee Stock Ownership Plan ("ESOP").
	The 401(k) Plan is available to all employees (age 21 and over) with one year of service and who work at least 1,000 hours per year.  Participants in the plan have the option to contribute from 1% to 20% of their annual compensation.  CTBI matches 50% of participant contributions up to 4% of gross pay. CTBI may at its discretion, contribute an additional percentage of covered employees' compensation.  CTBI's matching contributions were $1.0 million for the years ended December 31, 2014, 2013, and 2012.  The 401(k) Plan owned 503,082, 487,330, and 551,527 shares of CTBI's common stock at December 31, 2014, 2013, and 2012, respectively.  Substantially all shares owned by the 401(k) were allocated to employee accounts on those dates. The market price of the shares at the date of allocation is essentially the same as the market price at the date of purchase.
	The ESOP Plan has the same entrance requirements as the 401(k) Plan above.  CTBI currently contributes 4% of covered employees' gross compensation to the ESOP.  The ESOP uses the contributions to acquire shares of CTBI's common stock.  CTBI's contributions to the ESOP were $1.5 million for the years ended December 31, 2014 and 2013 and $1.4 million for the year ended 2012.  The ESOP owned 752,710, 746,260, and 748,674 shares of CTBI's common stock at December 31, 2014, 2013, and 2012, respectively.  Substantially all shares owned by the ESOP were allocated to employee accounts on those dates.  The market price of the shares at the date of allocation is essentially the same as the market price at the date of purchase.
	Stock-Based Compensation:
	CTBI currently maintains one active and one inactive incentive stock option plan covering key employees.  The 2006 Stock Ownership Incentive Plan ("2006 Plan") was approved by the Board of Directors and the Shareholders in 2006.  The 1998 Stock Option Plan ("1998 Plan") was approved by the Board of Directors and the Shareholders in 1998.  The 1998 Plan was rendered inactive as of April 26, 2006.  The 2006 Plan had 1,650,000 shares authorized, 1,345,876 of which were available at December 31, 2014 for future grants.  In addition, any shares reserved for issuance under the 1998 Stock Option Plan ("1998 Plan") in excess of the number of shares as to which options or other benefits are awarded thereunder, plus any shares as to which options or other benefits granted under the 1998 Plan may lapse, expire, terminate or be canceled, shall also be reserved and available for issuance or reissuance under the 2006 Plan.  As of December 31, 2014, the 1998 Plan had 1,151,514 shares authorized, 217,826 of which were transferred to the 2006 Plan.  The total shares available for issuance under the 2006 Plan as of December 31, 2014 was 1,563,702.  The following table provides detail of the number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance under all of CTBI's equity compensation plans as of December 31, 2014:
	Plan Category (shares in thousands)		Number of Shares to Be Issued Upon Exercise			Weighted Average Price			Shares Available for Future Issuance
	Equity compensation plans approved by shareholders:
	Stock options		143			$31.47			1,564 (a)
	Restricted stock		(c)			(b)			(a)
	Performance units		(d)			(b)			(a)
	Stock appreciation rights ("SARs")		(e)			(b)			(a)
	Total								1,564
	(a)	Under the 2006 Plan, 1.65 million shares (plus any shares reserved for issuance under the 1998 Stock Option Plan) were authorized for issuance as nonqualified and incentive stock options, SARS, restricted stock and performance units.  As of December 31, 2014, the above shares remained available for issuance.
	(b)	Not applicable
	(c)	The maximum number of shares of restricted stock that may be granted is 440,000 shares, and the maximum that may be granted to a participant during any calendar year is 44,000 shares.
	(d)	No performance units payable in stock had been issued as of December 31, 2014.  The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $250,000.
	(e)	No SARS have been issued.  The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year shall be 110,000 shares.
	The following table details the shares available for future issuance under the 2006 Plan at December 31, 2014.
	Plan Category	Shares Available for Future Issuance
	Shares available at January 1, 2014	1,573,980
	1998 Plan forfeitures in 2014	0
	2006 Plan stock option issuances for 2014	-10,000
	2006 Plan restricted stock issuances in 2014	-4,561
	2006 Plan forfeitures in 2014	4,283
	Shares available for future issuance	1,563,702
	CTBI uses a Black-Scholes option pricing model with the following weighted average assumptions, which are evaluated and revised as necessary, in estimating the grant-date fair value of each option grant for the year end:
		2014	2013	2012
	Expected option life (in years)	7	7.5	--
	Expected volatility	30.77%	39.11%	--
	Expected dividend yield	3.40%	3.74%	--
	Risk-free interest rate	2.01%	1.33%	--
	The expected option life is derived from the "safe-harbor" rules for estimating option life in ASC 718, Share-Based Payment.  The expected volatility is based on historical volatility of the stock using a historical look back that approximates the expected life of the option grant.  The interest rate for periods within the contractual life of the option is based on the U.S. Treasury yield curve in effect at the time of the grant.  CTBI's stock-based compensation expense for the years 2014, 2013, and 2012 was $0.9 million, $0.7 million, and $0.6 million, respectively.  Included in stock-based compensation expense were dividends paid on restricted stock shares in the amount of $121 thousand, $124 thousand, and $121 thousand, respectively, for the same periods.
	CTBI's stock option activity for the 2006 Plan for the years ended December 31, 2014, 2013, and 2012 is summarized as follows:
	31-Dec		2014							2013					2012
			Options				Weighted Average Exercise Price			Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
	Outstanding at beginning of year			97,047			$	32.29			163,524		$	31.56		167,828		$	31.43
	Granted			10,000				34.75			1,650			30.64		0			--
	Exercised			(5,757	)			34.62			(68,127	)		30.52		(3,507	)		25.92
	Forfeited/expired			(2,469	)			34.29			0			--		(797	)		--
	Outstanding at end of year			98,821			$	32.35			97,047		$	32.29		163,524		$	31.56
	Exercisable at end of year			86,264			$	32.25			92,997		$	32.56		112,555		$	34.26
	A summary of the status of CTBI's 2006 Plan for nonvested options as of December 31, 2014, and changes during the year ended December 31, 2014, is presented as follows:
	Nonvested Options		Options				Weighted Average Grant Date Fair Value
	Nonvested at January 1, 2014			4,051			$	6.87
	Granted			10,000				7.76
	Vested			(1,274	)			6.68
	Forfeited			(220	)			5.94
	Nonvested at December 31, 2014			12,557			$	7.61
	The weighted average remaining contractual term in years of the shares outstanding at December 31, 2014 was 3.35 years.
	The weighted-average fair value of options granted from the 2006 Plan during the year 2014 was $0.08 million, or $7.76 per share.  The weighted-average fair value of options granted from the 2006 Plan during the year 2013 was $0.01 million or $8.23 per share.  No stock options were granted during 2012.
	The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 2006 Plan for the years ended December 31, 2014, 2013, and 2012:
	(in thousands)		2014				2013			2012
	Options exercised		$	11			$	477		$	22
	Options exercisable			376				790			88
	Outstanding options			421				849			388
	The following table shows restricted stock activity for the years ended December 31, 2014, 2013, and 2012:
	31-Dec		2014							2013					2012
			Grants				Weighted Average Fair			Grants			Weighted Average Fair		Grants			Weighted Average Fair
							Value at Grant						Value at Grant					Value at Grant
	Outstanding at beginning of year			107,511			$	25.91			106,561		$	25.38		106,197		$	25.37
	Granted			4,561				37.85			11,904			30.64		364			28.11
	Vested			(8,949	)			28.35			(10,954	)		25.87		0			--
	Forfeited			(1,814	)			28.38			0			--		0			--
Outstanding at end of year			101,309			$	26.19			107,511		$	25.91		106,561		$	25.38
CTBI's stock option activity for the 1998 Plan for the years ended December 31, 2014, 2013, and 2012 is summarized as follows:
31-Dec		2014							2013					2012
		Options				Weighted Average Exercise Price			Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
Outstanding at beginning of year			78,066			$	28.91			195,279		$	28.08		353,694		$	24.41
Granted			0				--			0			--		0			--
Exercised			(34,106	)			28.25			(117,213	)		27.54		(158,305	)		19.85
Forfeited/expired			0				--			0			--		(110	)		29.49
Outstanding at end of year			43,960			$	29.43			78,066		$	28.91		195,279		$	28.08
Exercisable at end of year			43,960			$	29.43			78,066		$	28.91		195,279		$	28.08
The weighted average remaining contractual term in years of the shares outstanding at December 31, 2014 was 1.03 years.
The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 1998 Plan for the years ended December 31, 2014, 2013, and 2012:
(in thousands)		2014				2013			2012
Options exercised		$	270			$	1,175		$	690
Options exercisable			316				948			1,517
Outstanding options			316				948			1,517
There were no nonvested options in the 1998 Plan shares as of December 31, 2014 and December 31, 2013.
The following table shows the unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the plans at December 31, 2014, 2013, and 2012 and the total grant-date fair value of shares vested, cash received from option exercises under all share-based payment arrangements, and the actual tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the years ended December 31, 2014, 2013, and 2012.
(in thousands)		2014				2013			2012
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end		$	861			$	1,366		$	1,133
Grant date fair value of shares vested for the year			343				521			34
Cash received from option exercises under all share-based payment arrangements for the year			1,163				5,306			3,137
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year			93				303			496
The unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the plans at December 31, 2014 is expected to be recognized over a weighted-average period of 1.9 years.

Operating_Leases

Operating Leases	12 Months Ended
	Dec. 31, 2014
Operating Leases [Abstract]
Operating Leases	15.  Operating Leases
	Certain premises and equipment are leased under operating leases.  Additionally, certain premises are leased or subleased to third parties.  These leases generally contain renewal options and require CTBI to pay all executory costs, such as taxes, maintenance fees, and insurance.  Minimum non-cancellable rental payments and rental receipts are as follows:
	(in thousands)	Payments		Receipts
	2015		1,970		577
	2016		1,411		339
	2017		1,270		210
	2018		862		78
	2019		356		4
	Thereafter		2,781		0
	Total	$	8,650	$	1,208
	Rental expense net of rental income under operating leases was $1.3 million for 2014, $1.2 million for 2013, and $0.8 million for 2012.

Fair_Market_Value_of_Financial

Fair Market Value of Financial Assets and Liabilities	12 Months Ended
	Dec. 31, 2014
Fair Market Value of Financial Assets and Liabilities [Abstract]
Fair Market Value of Financial Assets and Liabilities	16.  Fair Market Value of Financial Assets and Liabilities
	Fair Value Measurements
	ASC 820, Fair Value Measurements, defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles and expands disclosures about fair value measurements.  ASC 820 applies whenever other standards require (or permit) assets or liabilities to be measured at fair value but does not expand the use of fair value in any new circumstances.  Fair value measurements must maximize the use of observable inputs and minimize the use of unobservable inputs.  In this standard, the FASB clarifies the principle that fair value should be based on the assumptions market participants would use when pricing the asset or liability.  In support of this principle, ASC 820 establishes a fair value hierarchy that prioritizes the information used to develop those assumptions.  The fair value hierarchy is as follows:
	Level 1 Inputs – Quoted prices in active markets for identical assets or liabilities.
	Level 2 Inputs - Inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. These might include quoted prices for similar assets and liabilities in active markets, and inputs other than quoted prices that are observable for the asset or liability, such as interest rates and yield curves that are observable at commonly quoted intervals.
	Level 3 Inputs - Unobservable inputs for determining the fair values of assets or liabilities that reflect an entity's own assumptions about the assumptions that market participants would use in pricing the assets or liabilities.
	Recurring Measurements
	The following tables present the fair value measurements of assets recognized in the accompanying balance sheets measured at fair value on a recurring basis as of December 31, 2014 and December 31, 2013 and indicate the level within the fair value hierarchy of the valuation techniques.
	(in thousands)					Fair Value Measurements at
						December 31, 2014 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – recurring basis
	Available-for-sale securities:
	U.S. Treasury and government agencies	$	188,932			$	0			$	188,932	$	0
	State and political subdivisions		137,458				0				137,458		0
	U.S. government sponsored agency mortgage-backed securities		288,907				0				288,907		0
	Marketable equity securities		24,889				24,889				0		0
	Mortgage servicing rights		2,968				0				0		2,968
	(in thousands)					Fair Value Measurements at
						December 31, 2013 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – recurring basis
	Available-for-sale securities:
	U.S. Treasury and government agencies	$	72,623			$	0			$	72,623	$	0
	State and political subdivisions		116,703				0				116,703		0
	U.S. government sponsored agency mortgage-backed securities		367,297				0				367,297		0
	Marketable equity securities		52,782				52,782				0		0
	Mortgage servicing rights		3,424				0				0		3,424
	Following is a description of the valuation methodologies and inputs used for assets measured at fair value on a recurring basis and recognized in the accompanying balance sheets, as well as the general classification of such assets pursuant to the valuation hierarchy.  These valuation methodologies were applied to all of CTBI's financial assets carried at fair value.  CTBI had no liabilities measured at fair value as of December 31, 2014 and December 31, 2013.  There have been no significant changes in the valuation techniques during the year ended December 31, 2014.  For assets classified within Level 3 of the fair value hierarchy, the process used to develop the reported fair value is described below.
	Available-for-Sale Securities
	Securities classified as available-for-sale are reported at fair value on a recurring basis.  CTBI's CRA investment funds (included in marketable equity securities) are classified as Level 1 of the valuation hierarchy where quoted market prices are available in the active market on which the individual securities are traded.
	If quoted market prices are not available, CTBI obtains fair value measurements from an independent pricing service, such as Interactive Data, which utilizes pricing models to determine fair value measurement.  CTBI reviews the pricing quarterly to verify the reasonableness of the pricing.  The fair value measurements consider observable data that may include dealer quotes, market spreads, cash flows, the U.S. Treasury yield curve, live trading levels, trade execution data, market consensus prepayment speeds, credit information and the bond's terms and conditions, among other factors.  U.S. Treasury and government agencies, state and political subdivisions, and U.S. government sponsored agency mortgage-backed securities are classified as Level 2 inputs.
	In certain cases where Level 1 or Level 2 inputs are not available, securities are classified within Level 3 of the hierarchy.    Fair value determinations for Level 3 measurements are estimated on a quarterly basis where assumptions used are reviewed to ensure the estimated fair value complies with accounting standards generally accepted in the United States.  As of December 31, 2014, CTBI does not own any securities classified as Level 3 inputs.
	Mortgage Servicing Rights
	Mortgage servicing rights do not trade in an active, open market with readily observable prices.  CTBI reports mortgage servicing rights at fair value on a recurring basis with subsequent remeasurement of MSRs based on change in fair value.
	In determining fair value, CTBI utilizes the expertise of an independent third party.  Accordingly, fair value is determined by the independent third party by utilizing assumptions about factors such as mortgage interest rates, discount rates, mortgage loan prepayment speeds, market trends and industry demand.  Due to the nature of the valuation inputs, mortgage servicing rights are classified within Level 3 of the hierarchy.  Fair value determinations for Level 3 measurements of mortgage servicing rights are tested for impairment on a quarterly basis where assumptions used are reviewed to ensure the estimated fair value complies with accounting standards generally accepted in the United States.  See the table below for inputs and valuation techniques used for Level 3 mortgage servicing rights.
	Transfers between Levels
	There were no transfers between Levels 1, 2, and 3 as of December 31, 2014.
	Level 3 Reconciliation
	Following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying balance sheet using significant unobservable (Level 3) inputs:
	(in thousands)	2014				2013
		Mortgage Servicing Rights				Mortgage Servicing Rights
	Beginning balance	$	3,424			$	2,364
	Total recognized gains (losses)
	Included in net income		(467	)			788
	Issues		374				854
	Settlements		(363	)			(582	)
	Ending balance	$	2,968			$	3,424
	Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date	$	(467	)		$	788
	Realized and unrealized gains and losses for items reflected in the table above are included in net income in the consolidated statements of income as follows:
	(in thousands)	2014								2013
		Noninterest Income				Noninterest Expense				Noninterest Income		Noninterest Expense
	Total gains (losses)	$	(830	)		$	0			$	206	$	0
	Nonrecurring Measurements
	The following tables present the fair value measurements of assets recognized in the accompanying balance sheets measured at fair value on a nonrecurring basis as of December 31, 2014 and December 31, 2013 and indicate the level within the fair value hierarchy of the valuation techniques.
	(in thousands)					Fair Value Measurements at
						December 31, 2014 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – nonrecurring basis
	Impaired loans (collateral dependent)	$	4,665			$	0			$	0	$	4,665
	Other real estate/assets owned		6,472				0				0		6,472
(in thousands)					Fair Value Measurements at
					December 31, 2013 Using
	Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
					(Level 1)				(Level 2)		(Level 3)
Assets measured – nonrecurring basis
Impaired loans (collateral dependent)	$	6,830			$	0			$	0	$	6,830
Other real estate/assets owned		11,111				0				0		11,111
Following is a description of the valuation methodologies and inputs used for assets measured at fair value on a nonrecurring basis and recognized in the accompanying balance sheet, as well as the general classification of such assets pursuant to the valuation hierarchy.  For assets classified within Level 3 of the fair value hierarchy, the process used to develop the reported fair value is described below.
Impaired Loans (Collateral Dependent)
The estimated fair value of collateral-dependent impaired loans is based on the appraised fair value of the collateral, less estimated cost to sell.  Collateral-dependent impaired loans are classified within Level 3 of the fair value hierarchy.
CTBI considers the appraisal or evaluation as the starting point for determining fair value and then considers other factors and events in the environment that may affect the fair value.  Appraisals of the collateral underlying collateral-dependent loans are obtained when the loan is determined to be collateral-dependent and subsequently as deemed necessary by the Chief Credit Officer.  Appraisals are reviewed for accuracy and consistency by the Chief Credit Officer.  Appraisers are selected from the list of approved appraisers maintained by management.  The appraised values are reduced by discounts to consider lack of marketability and estimated cost to sell if repayment or satisfaction of the loan is dependent on the sale of the collateral.  These discounts and estimates are developed by the Chief Credit Officer by comparison to historical results.
Loans considered impaired under ASC 310-35, Impairment of a Loan, are loans for which, based on current information and events, it is probable that the creditor will be unable to collect all amounts due according to the contractual terms of the loan agreement.  Impaired loans are subject to nonrecurring fair value adjustments to reflect subsequent (i) partial write-downs that are based on the observable market price or current appraised value of the collateral or (ii) the full charge-off of the loan carrying value.  Fair value adjustments on impaired loans disclosed above were $0.4 million and $0.6 million for the years ended December 31, 2014 and December 31, 2013, respectively.
Other Real Estate Owned
In accordance with the provisions of ASC 360, Property, Plant, and Equipment, other real estate owned (OREO) is carried at the lower of fair value at acquisition date or current estimated fair value, less estimated cost to sell when the real estate is acquired.  Estimated fair value of OREO is based on appraisals or evaluations.  OREO is classified within Level 3 of the fair value hierarchy.  Long-lived assets are subject to nonrecurring fair value adjustments to reflect subsequent partial write-downs that are based on the observable market price or current appraised value of the collateral.  Fair value adjustments on other real estate/assets owned were $1.7 million and $2.5 million for the years ended December 31, 2014 and December 31, 2013, respectively.
Our policy for determining the frequency of periodic reviews is based upon consideration of the specific properties and the known or perceived market fluctuations in a particular market and is typically between 12 and 18 months but generally not more than 24 months.  Appraisers are selected from the list of approved appraisers maintained by management.
Unobservable (Level 3) Inputs
The following tables present quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements at December 31, 2014 and December 31, 2013.
(in thousands)	Quantitative Information about Level 3 Fair Value Measurements
	Fair Value at December 31, 2014			Valuation Technique(s)	Unobservable Input		Range (Weighted Average)
Mortgage servicing rights	$	2,968		Discount cash flows, computer pricing model	Constant prepayment rate			4.6% - 25.1%	%)
								(11.3
					Probability of default			0.00% - 100.0%	%)
								(3.61
					Discount rate			10.0% - 11.5%	%)
								(10.13
Impaired loans (collateral-dependent)	$	4,665		Market comparable properties	Marketability discount			5.0% - 10.0%	%)
								(7.0
Other real estate/assets owned	$	6,472		Market comparable properties	Comparability adjustments (%)			3.0% - 67.0%	%)
								(18.0
(in thousands)	Quantitative Information about Level 3 Fair Value Measurements
	Fair Value at December 31, 2013			Valuation Technique(s)	Unobservable Input		Range (Weighted Average)
Mortgage servicing rights	$	3,424		Discount cash flows, computer pricing model	Constant prepayment rate			4.3% - 23.6%	%)
								(9.7
					Probability of default			0.00% - 33.33%	%)
								(3.36
					Discount rate		Not applicable (10.0%)
Impaired loans (collateral-dependent)	$	6,830		Market comparable properties	Marketability discount			5.0% - 10.0%	%)
								(7.0
Other real estate/assets owned	$	11,111		Market comparable properties	Comparability adjustments (%)			5.0% - 38.0%	%)
								(9.0
Sensitivity of Significant Unobservable Inputs
The following is a discussion of the sensitivity of significant unobservable inputs, the interrelationships between those inputs and other unobservable inputs used in recurring fair value measurement and of how those inputs might magnify or mitigate the effect of changes in the unobservable inputs on the fair value measurement.
Mortgage Servicing Rights
Market value for mortgage servicing rights is derived based on unobservable inputs, such as prepayment speeds of the underlying loans generated using the Andrew Davidson Prepayment Model, FHLMC/FNMA guidelines, the weighted-average life of the loan, the discount rate, the weighted average coupon, and the weighted average default rate.  Significant increases (decreases) in either of those inputs in isolation would result in a significantly lower (higher) fair value measurement.  Generally, a change in the assumption used for prepayment speeds is accompanied by a directionally opposite change in the assumption for interest rates.
Fair Value of Financial Instruments
The following table presents estimated fair value of CTBI's financial instruments as of December 31, 2014 and indicates the level within the fair value hierarchy of the valuation techniques.
					Fair Value Measurements
(in thousands)					at December 31, 2014 Using
	Carrying Amount				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs
					(Level 1)						(Level 3)
Financial assets:
Cash and cash equivalents	$	105,517			$	105,517			$	0	$	0
Certificates of deposit in other banks		8,197				0				8,213		0
Securities available-for-sale		640,186				24,889				615,297		0
Securities held-to-maturity		1,662				0				1,644		0
Loans held for sale		2,264				2,321				0		0
Loans, net		2,699,377				0				0		2,691,906
Federal Home Loan Bank stock		17,927				0				17,927		0
Federal Reserve Bank stock		4,869				0				4,869		0
Accrued interest receivable		13,548				0				13,548		0
Mortgage servicing rights		2,968				0				0		2,968
Financial liabilities:
Deposits	$	2,874,257			$	677,626			$	2,192,848	$	0
Repurchase agreements		235,186				0				0		235,193
Federal funds purchased		11,041				0				11,041		0
Advances from Federal Home Loan Bank		61,170				0				61,106		0
Long-term debt		61,341				0				0		35,615
Accrued interest payable		908				0				908		0
Unrecognized financial instruments:
Letters of credit	$	0			$	0			$	0	$	0
Commitments to extend credit		0				0				0		0
Forward sale commitments		0				0				0		0
The following table presents estimated fair value of CTBI's financial instruments as of December 31, 2013 and indicates the level within the fair value hierarchy of the valuation techniques.
					Fair Value Measurements
(in thousands)					at December 31, 2013 Using
	Carrying Amount				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs
					(Level 1)						(Level 3)
Financial assets:
Cash and cash equivalents	$	106,641			$	106,641			$	0	$	0
Certificates of deposit in other banks		9,568				0				9,582		0
Securities available-for-sale		609,405				52,782				556,623		0
Securities held-to-maturity		1,662				0				1,601		0
Loans held for sale		828				845				0		0
Loans, net		2,581,346				0				0		2,589,811
Federal Home Loan Bank stock		25,673				0				25,673		0
Federal Reserve Bank stock		4,886				0				4,886		0
Accrued interest receivable		12,886				0				12,886		0
Mortgage servicing rights		3,424				0				0		3,424
Financial liabilities:
Deposits	$	2,855,074			$	621,321			$	2,230,608	$	0
Repurchase agreements		208,067				0				0		207,992
Federal funds purchased		12,465				0				12,465		0
Advances from Federal Home Loan Bank		1,286				0				1,531		0
Long-term debt		61,341				0				0		31,362
Accrued interest payable		1,032				0				1,032		0
Unrecognized financial instruments:
Letters of credit	$	0			$	0			$	0	$	0
Commitments to extend credit		0				0				0		0
Forward sale commitments		0				0				0		0
The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate that value:
Cash and cash equivalents – The carrying amount approximates fair value.
Certificates of deposit in other banks – Fair values are based on quoted market prices or dealer quotes for similar instruments.
Securities held-to-maturity – Fair values are based on quoted market prices, if available.  If a quoted price is not available, fair value is estimated using quoted prices for similar securities.  The fair value estimate is provided to management from a third party using modeling assumptions specific to each type of security that are reviewed and approved by management.  Quarterly sampling of fair values provided by additional third parties supplement the fair value review process.
Loans held for sale – The fair value is predetermined at origination based on sale price.
Loans (net of the allowance for loan and lease losses) – The fair value of fixed rate loans and variable rate mortgage loans is estimated by discounting the future cash flows using current rates at which similar loans would be made to borrowers with similar credit ratings and for the same remaining maturities.  For other variable rate loans, the carrying amount approximates fair value.
Federal Home Loan Bank stock – The carrying value of Federal Home Loan Bank stock approximates fair value based on the redemption provisions of the Federal Home Loan Bank.
Federal Reserve Bank stock – The carrying value of Federal Reserve Bank stock approximates fair value based on the redemption provisions of the Federal Reserve Bank.
Accrued interest receivable – The carrying amount approximates fair value.
Deposits – The fair value of fixed maturity time deposits is estimated by discounting the future cash flows using the rates currently offered for deposits of similar remaining maturities.  For deposits including demand deposits, savings accounts, NOW accounts, and certain money market accounts, the carrying value approximates fair value.
Repurchase agreements – The fair value is estimated by discounting future cash flows using current rates.
Federal funds purchased – The carrying amount approximates fair value.
Advances from Federal Home Loan Bank – The fair value of these fixed-maturity advances is estimated by discounting future cash flows using rates currently offered for advances of similar remaining maturities.
Long-term debt – The fair value is estimated by discounting future cash flows using current rates.
Accrued interest payable – The carrying amount approximates fair value.
Commitments to originate loans, forward sale commitments, letters of credit, and lines of credit – The fair value of commitments to originate loans is estimated using the fees currently charged to enter into similar agreements, taking into account the remaining terms of the agreements and the present creditworthiness of the counterparties.  For fixed-rate loan commitments, fair value also considers the difference between current levels of interest rates and the committed rates.  The fair value of forward sale commitments is estimated based on current market prices for loans of similar terms and credit quality.  The fair values of letters of credit and lines of credit are based on fees currently charged for similar agreements or on the estimated cost to terminate or otherwise settle the obligations with the counterparties at the reporting date.  The fair values of these commitments are not material.

OffBalance_Sheet_Transactions_

Off-Balance Sheet Transactions and Guarantees	12 Months Ended
	Dec. 31, 2014
Off-Balance Sheet Transactions and Guarantees [Abstract]
Off-Balance Sheet Transactions and Guarantees	17.  Off-Balance Sheet Transactions and Guarantees
	CTBI is a party to transactions with off-balance sheet risk in the normal course of business to meet the financing needs of its customers.  These financial instruments include standby letters of credit and commitments to extend credit in the form of unused lines of credit.  CTBI uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments.
	At December 31, CTBI had the following off-balance sheet financial instruments, whose approximate contract amounts represent additional credit risk to CTBI:
	(in thousands)	2014		2013
	Standby letters of credit	$	28,524	$	34,861
	Commitments to extend credit		459,380		410,803
	Total off-balance sheet financial instruments	$	487,904	$	445,664
	Standby letters of credit represent conditional commitments to guarantee the performance of a third party.  The credit risk involved is essentially the same as the risk involved in making loans.  At December 31, 2014, we maintained a credit loss reserve of approximately $4 thousand relating to these financial standby letters of credit.  The reserve coverage calculation was determined using essentially the same methodology as used for the allowance for loan and lease losses.  Approximately 81% of the total standby letters of credit are secured, with $20.6 million of the total $28.5 million secured by cash.  Collateral for the remaining secured standby letters of credit varies but is comprised primarily of accounts receivable, inventory, property, equipment, and income-producing properties.
	Commitments to extend credit are agreements to originate loans to customers as long as there is no violation of any condition of the contract.  At December 31, 2014, a credit loss reserve of $223 thousand was maintained relating to these commitments.  Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee.  Since a portion of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements.  Each customer's creditworthiness is evaluated on a case-by-case basis.  The amount of collateral obtained, if deemed necessary, is based on management's credit evaluation of the counterparty.  Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, commercial real estate, and residential real estate.  A portion of the commitments is to extend credit at fixed rates.  Fixed rate loan commitments at December 31, 2014 of $36.6 million had interest rates ranging predominantly from 3.50% to 5.00%, respectively, and terms predominantly less than 1 year.  These credit commitments were based on prevailing rates, terms, and conditions applicable to other loans being made at December 31, 2014.
	Included in our commitments to extend credit are mortgage loans in the process of origination which are intended for sale to investors in the secondary market.  These forward sale commitments are on an individual loan basis that CTBI originates as part of its mortgage banking activities.  CTBI commits to sell the loans at specified prices in a future period, typically within 60 days.  These commitments are acquired to reduce market risk on mortgage loans in the process of origination and mortgage loans held for sale since CTBI is exposed to interest rate risk during the period between issuing a loan commitment and the sale of the loan into the secondary market.  Total mortgage loans in the process of origination amounted to $0.3 million and $1.6 million at December 31, 2014 and 2013, respectively, and mortgage loans held for sale amounted to $2.3 million and $0.8 million at both December 31, 2014 and 2013, respectively.

Concentrations_of_Credit_Risk

Concentrations of Credit Risk	12 Months Ended
	Dec. 31, 2014
Concentrations of Credit Risk [Abstract]
Concentrations of Credit Risk	18.  Concentrations of Credit Risk
	CTBI's banking activities include granting commercial, residential, and consumer loans to customers primarily located in eastern, northeastern, central, and south central Kentucky, southern West Virginia, and northeastern Tennessee.  CTBI is continuing to manage all components of its portfolio mix in a manner to reduce risk from changes in economic conditions. Concentrations of credit, as defined for regulatory purposes, are reviewed quarterly by management to ensure that internally established limits based on Tier 1 Capital plus the allowance for loan and lease losses are not exceeded.  At December 31, 2014 and 2013, our concentrations of lessors of non-residential buildings credits were 39% and 33% of Tier 1 Capital plus the allowance for loan and lease losses, respectively.  Lessors of residential buildings and dwellings were 34% for both 2014 and 2013, respectively.  Hotel/motel industry credits were 31% and 33%, respectively.  These percentages are within our internally established limits regarding concentrations of credit.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies [Abstract]
Commitments and Contingencies	19.  Commitments and Contingencies
	CTBI and our subsidiaries, and from time to time, our officers, are named defendants in legal actions arising from ordinary business activities.  Management, after consultation with legal counsel, believes any pending actions are without merit or that the ultimate liability, if any, will not materially affect our consolidated financial position or results of operations.

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2014
Regulatory Matters [Abstract]
Regulatory Matters	20.  Regulatory Matters
	CTBI's principal source of funds is dividends received from our banking subsidiary, CTB.  Regulations limit the amount of dividends that may be paid by CTB without prior approval.  During 2015, approximately $53.2 million plus any 2015 net profits can be paid by CTB without prior regulatory approval.
	The Federal Reserve Bank adopted quantitative measures which assign risk weightings to assets and off-balance sheet items and also define and set minimum regulatory capital requirements (risk based capital ratios).  All banks are required to have a minimum Tier 1 (core capital) leverage ratio of 4% of adjusted quarterly average assets, Tier 1 capital of at least 4% of risk-weighted assets, and total capital of at least 8% of risk-weighted assets.  Tier 1 capital consists principally of shareholders' equity including capital-qualifying subordinated debt but excluding unrealized gains and losses on securities available-for-sale, less goodwill and certain other intangibles.  Total capital consists of Tier 1 capital plus certain debt instruments and the reserve for credit losses, subject to limitation.  Failure to meet certain capital requirements can initiate certain actions by regulators that, if undertaken, could have a direct material effect on our consolidated financial statements.  The regulations also define well-capitalized levels of Tier 1 leverage, Tier 1, and total capital as 5%, 6%, and 10%, respectively.  We had Tier 1 leverage, Tier 1, and total capital ratios above the well-capitalized levels at December 31, 2014 and 2013.  We believe, as of December 31, 2014, CTBI meets all capital adequacy requirements for which it is subject to be defined as well-capitalized under the regulatory framework for prompt corrective action.
	Under the current Federal Reserve Board's regulatory framework, certain capital securities offered by wholly owned unconsolidated trust preferred entities of CTBI are included as Tier 1 regulatory capital.  On March 1, 2005, the Federal Reserve Board adopted a final rule that allows the continued limited inclusion of trust preferred securities in the Tier 1 capital of bank holding companies ("BHCs").  Under the final rule, trust preferred securities and other restricted core capital elements are subject to stricter quantitative limits.  The Board's final rule limits restricted core capital elements to 25 percent of all core capital elements, net of goodwill less any associated deferred tax liability.  Amounts of restricted core capital elements in excess of these limits generally may be included in Tier 2 capital.  The final rule provided a five-year transition period, which ended March 31, 2009, for application of the quantitative limits.  The requirement for trust preferred securities to include a call option has been eliminated, and standards for the junior subordinated debt underlying trust preferred securities eligible for Tier 1 capital treatment have been clarified.  The final rule addresses supervisory concerns, competitive equity considerations, and the accounting for trust preferred securities. The final rule also strengthens the definition of regulatory capital by incorporating longstanding Board policies regarding the acceptable terms of capital instruments included in banking organizations' Tier 1 or Tier 2 capital.  The final rule did not have a material impact on our regulatory ratios.
	Consolidated Capital Ratios
		Actual					For Capital Adequacy Purposes
	(in thousands)	Amount		Ratio			Amount		Ratio
	As of December 31, 2014:
	Tier 1 capital (to average assets)	$	439,877		12.04	%	$	146,139		4	%
	Tier 1 capital (to risk weighted assets)		439,877		16.51			106,572		4
	Total capital (to risk weighted assets)		473,097		17.76			213,107		8
	As of December 31, 2013:
	Tier 1 capital (to average assets)	$	412,053		11.51	%	$	143,198		4	%
	Tier 1 capital (to risk weighted assets)		412,053		16.15			102,056		4
	Total capital (to risk weighted assets)		443,875		17.4			204,080		8
	Community Trust Bank, Inc.'s Capital Ratios
		Actual					For Capital Adequacy Purposes					To Be Well-Capitalized Under Prompt Corrective Action Provision
	(in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
	As of December 31, 2014:
	Tier 1 capital (to average assets)	$	416,861		11.47	%	$	145,374		4	%	$	181,718		5	%
	Tier 1 capital (to risk weighted assets)		416,861		15.69			106,274		4			159,411		6
	Total capital (to risk weighted assets)		450,081		16.94			212,553		8			265,691		10
	As of December 31, 2013:
	Tier 1 capital (to average assets)	$	392,932		11.03	%	$	142,496		4	%	$	178,120		5	%
	Tier 1 capital (to risk weighted assets)		392,932		15.45			101,730		4			152,595		6
	Total capital (to risk weighted assets)		424,754		16.7			203,475		8			254,344		10
	On July 2, 2013, the Federal Reserve approved final rules that substantially amend the regulatory risk-based capital rules applicable to CTBI and CTB.  The FDIC has subsequently approved these rules.  The final rules were adopted following the issuance of proposed rules by the Federal Reserve in June 2012, and the "Basel III" regulatory capital reforms and changes required by the Dodd-Frank Act were implemented.  "Basel III" refers to two consultative documents released by the Basel Committee on Banking Supervision in December 2009, the rules text released in December 2010, and loss absorbency rules issued in January 2011, which include significant changes to bank capital, leverage, and liquidity requirements.
	The rules include new risk-based capital and leverage ratios, which will be phased in from 2015 to 2019, and refine the definition of what constitutes "capital" for purposes of calculating those ratios.  The new minimum capital level requirements applicable to CTBI and CTB under the final rules are: (i) a new common equity Tier 1 capital ratio of 4.5%; (ii) a Tier 1 capital ratio of 6% (increased from 4%); (iii) a total capital ratio of 8% (unchanged from current rules); and (iv) a Tier 1 leverage ratio of 4% for all institutions.  The final rules also establish a "capital conservation buffer" above the new regulatory minimum capital requirements, which must consist entirely of common equity Tier 1 capital.  The capital conservation buffer will be phased-in over four years beginning on January 1, 2016, as follows: the maximum buffer will be 0.625% of risk-weighted assets for 2016, 1.25% for 2017, 1.875% for 2018, and 2.5% for 2019 and thereafter.  This will result in the following minimum ratios beginning in 2019: (i) a common equity Tier 1 capital ratio of 7.0%, (ii) a Tier 1 capital ratio of 8.5%, and (iii) a total capital ratio of 10.5%.  Under the final rules, institutions are subject to limitations on paying dividends, engaging in share repurchases, and paying discretionary bonuses if its capital level falls below the buffer amount. These limitations establish a maximum percentage of eligible retained income that could be utilized for such actions.
	Basel III provided discretion for regulators to impose an additional buffer, the "countercyclical buffer," of up to 2.5% of common equity Tier 1 capital to take into account the macro-financial environment and periods of excessive credit growth.  However, the final rules permit the countercyclical buffer to be applied only to "advanced approach banks" ( i.e. , banks with $250 billion or more in total assets or $10 billion or more in total foreign exposures), which currently excludes CTBI and CTB.  The final rules also implement revisions and clarifications consistent with Basel III regarding the various components of Tier 1 capital, including common equity, unrealized gains and losses, as well as certain instruments that will no longer qualify as Tier 1 capital, some of which will be phased out over time.  However, the final rules provide that small depository institution holding companies with less than $15 billion in total assets as of December 31, 2009 (which includes CTBI) will be able to permanently include non-qualifying instruments that were issued and included in Tier 1 or Tier 2 capital prior to May 19, 2010 in additional Tier 1 or Tier 2 capital until they redeem such instruments or until the instruments mature.
	The final rules also contain revisions to the prompt corrective action framework, which is designed to place restrictions on insured depository institutions, including CTB, if their capital levels begin to show signs of weakness.  These revisions took effect January 1, 2015.  Under the prompt corrective action requirements, which are designed to complement the capital conservation buffer, insured depository institutions will be required to meet the following increased capital level requirements in order to qualify as "well capitalized:" (i) a new common equity Tier 1 capital ratio of 6.5%; (ii) a Tier 1 capital ratio of 8% (increased from 6%); (iii) a total capital ratio of 10% (unchanged from current rules); and (iv) a Tier 1 leverage ratio of 5% (increased from 4%).
	The final rules set forth certain changes for the calculation of risk-weighted assets, which were required to begin utilizing January 1, 2015.  The standardized approach final rule utilizes an increased number of credit risk exposure categories and risk weights, and also addresses: (i) an alternative standard of creditworthiness consistent with Section 939A of the Dodd-Frank Act; (ii) revisions to recognition of credit risk mitigation; (iii) rules for risk weighting of equity exposures and past due loans; (iv) revised capital treatment for derivatives and repo-style transactions; and (v) disclosure requirements for top-tier banking organizations with $50 billion or more in total assets that are not subject to the "advance approach rules" that apply to banks with greater than $250 billion in consolidated assets.  Based on our current capital composition and levels, we anticipate that our capital ratios, on a Basel III basis, will continue to exceed the well-capitalized minimum capital requirements.

Parent_Company_Financial_State

Parent Company Financial Statements	12 Months Ended
	Dec. 31, 2014
Parent Company Financial Statements [Abstract]
Parent Company Financial Statements	21.  Parent Company Financial Statements
	Condensed Balance Sheets
	(in thousands)	2014			2013
	31-Dec
	Assets:
	Cash on deposit	$	995		$	1,272
	Investment in and advances to subsidiaries		503,252			468,240
	Goodwill		4,973			4,973
	Premises and equipment, net		207			235
	Other assets		1,173			617
	Total assets	$	510,600		$	475,337
	Liabilities and shareholders' equity:
	Long-term debt	$	61,341		$	61,341
	Other liabilities		1,382			1,504
	Total liabilities		62,723			62,845
	Shareholders' equity		447,877			412,492
	Total liabilities and shareholders' equity	$	510,600		$	475,337
	Condensed Statements of Income and Comprehensive Income
	(in thousands)	2014			2013			2012
	Year Ended December 31
	Income:
	Dividends from subsidiary banks	$	19,534		$	13,035		$	16,572
	Other income		196			545			238
	Total income		19,730			13,580			16,810
	Expenses:
	Interest expense		1,131			1,161			2,403
	Depreciation expense		153			163			127
	Other expenses		2,550			2,442			1,990
	Total expenses		3,834			3,766			4,520
	Income before income taxes and equity in undistributed income of subsidiaries		15,896			9,814			12,290
	Income tax benefit		(1,548	)		(1,416	)		(1,750	)
	Income before equity in undistributed income of subsidiaries		17,444			11,230			14,040
	Equity in undistributed income of subsidiaries		25,807			33,942			30,822
	Net income	$	43,251		$	45,172		$	44,862
	Other comprehensive income:
	Unrealized holding gains (losses) on securities available-for-sale:
	Unrealized holding gains arising during the period		13,928			(31,878	)		4,973
	Less: Reclassification adjustments for realized gains included in net income		211			45			(1,155	)
	Tax expense (benefit)		4,949			(11,142	)		1,336
	Other comprehensive income (loss), net of tax		9,190			(20,691	)		2,482
	Comprehensive income	$	52,441		$	24,481		$	47,344
	Condensed Statements of Cash Flows
	(in thousands)	2014			2013			2012
	Year Ended December 31
	Cash flows from operating activities:
	Net income	$	43,251		$	45,172		$	44,862
	Adjustments to reconcile net income to net cash provided by operating activities:
	Depreciation		153			163			127
	Equity in undistributed earnings of subsidiaries		(25,807	)		(33,942	)		(30,822	)
	Stock-based compensation		838			658			512
	Excess tax benefit of stock-based compensation		760			572			496
	Changes in:
	Other assets		(558	)		660			(771	)
	Other liabilities		563			1,505			495
	Net cash provided by operating activities		19,200			14,788			14,899
	Cash flows from investing activities:
	Purchase of premises and equipment		(125	)		(148	)		(166	)
	Repayment of investments in and advances to subsidiaries		(14	)		(40	)		(80	)
	Net cash used in investing activities		(139	)		(188	)		(246	)
	Cash flows from financing activities:
	Issuance of common stock		1,992			6,348			4,395
	Excess tax benefit of stock-based compensation		(760	)		(572	)		(496	)
	Dividends paid		(20,570	)		(24,546	)		(19,215	)
	Net cash used in financing activities		(19,338	)		(18,770	)		(15,316	)
Net decrease in cash and cash equivalents		(277	)		(4,170	)		(663	)
Cash and cash equivalents at beginning of year		1,272			5,442			6,105
Cash and cash equivalents at end of year	$	995		$	1,272		$	5,442

Earnings_Per_Share

Earnings Per Share	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Earnings Per Share	22.  Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per share:
	Year Ended December 31	2014		2013		2012
	(in thousands except per share data)
	Numerator:
	Net income	$	43,251	$	45,172	$	44,862
	Denominator:
	Basic earnings per share:
	Weighted average shares		17,326		17,158		17,013
	Diluted earnings per share:
	Dilutive effect of equity grants		71		82		60
	Adjusted weighted average shares		17,397		17,240		17,073
	Earnings per share:
	Basic earnings per share	$	2.5	$	2.63	$	2.64
	Diluted earnings per share		2.49		2.62		2.63
	There were no options to purchase common shares that were excluded from the diluted calculations above for the year ended December 31, 2014.  In addition to in-the-money stock options, unvested restricted stock grants were also used in the calculation of diluted earnings per share based on the treasury method.  Options to purchase 65,519 common shares at a weighted average price of $35.409 were excluded from the diluted calculations above for the year ended December 31, 2013, because the exercise prices on the options were greater than the average market price for the period.  Options to purchase 98,720 common shares at a price of $35.409 were excluded from the diluted calculations above for the year ended December 31, 2012.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income [Abstract]
Accumulated Other Comprehensive Income	23.  Accumulated Other Comprehensive Income
	Unrealized gains (losses) on AFS securities
	Amounts reclassified from accumulated other comprehensive income (AOCI) and the affected line items in the statements of income during the years ended December 31, 2014, 2013, and 2012 were:
		Amounts Reclassified from AOCI
	Year Ended December 31	2014			2013			2012
	(in thousands)
	Affected line item in the statements of income
	Securities gains (losses)	$	(211	)	$	(45	)	$	1,155
	Tax (benefit) expense		(74	)		(15	)		405
	Total reclassifications out of AOCI	$	(137	)	$	(30	)	$	750

Accounting_Policies_Policies

Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation – The consolidated financial statements include Community Trust Bancorp, Inc. ("CTBI") and its subsidiaries, including its principal subsidiary, Community Trust Bank, Inc. ("CTB").  Intercompany transactions and accounts have been eliminated in consolidation.
Nature of Operations	Nature of Operations – Substantially all assets, liabilities, revenues, and expenses are related to banking operations, including lending, investing of funds, obtaining of deposits, trust and wealth management operations, full service brokerage operations, and other financing activities.  All of our business offices and the majority of our business are located in eastern, northeastern, central, and south central Kentucky, southern West Virginia, and northeastern Tennessee.
Use of Estimates	Use of Estimates – In preparing the consolidated financial statements, management must make certain estimates and assumptions.  These estimates and assumptions affect the amounts reported for assets, liabilities, revenues, and expenses, as well as affecting the disclosures provided.  Future results could differ from the current estimates.  Such estimates include, but are not limited to, the allowance for loan and lease losses, valuation of other real estate owned, fair value of securities and mortgage servicing rights, goodwill, and valuation of deferred tax assets.
	The accompanying financial statements have been prepared using values and information currently available to CTBI.
	Given the volatility of current economic conditions, the values of assets and liabilities recorded in the financial statements could change rapidly, resulting in material future adjustments in asset values, the allowance for loan and lease losses, and capital.
Cash and Cash Equivalents	Cash and Cash Equivalents – CTBI considers all liquid investments with original maturities of three months or less to be cash equivalents.  Cash and cash equivalents include cash on hand, amounts due from banks, interest bearing deposits in other financial institutions, and federal funds sold.  Generally, federal funds are sold for one-day periods.
Certificates of Deposit in Other Banks	Certificates of Deposit in Other Banks – Certificates of deposit in other banks generally mature within 18 months and are carried at cost.
Investments	Investments – Management determines the classification of securities at purchase.  We classify securities into held-to-maturity, trading, or available-for-sale categories.  Held-to-maturity securities are those which we have the positive intent and ability to hold to maturity and are reported at amortized cost.  In accordance with Financial Accounting Standards Board (FASB) Accounting Standards Codification (ASC) 320, Investment Securities, investments in debt securities that are not classified as held-to-maturity and equity securities that have readily determinable fair values shall be classified in one of the following categories and measured at fair value in the statement of financial position:
	a. Trading securities. Securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) shall be classified as trading securities. Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price.
	b. Available-for-sale securities. Investments not classified as trading securities (nor as held-to-maturity securities) shall be classified as available-for-sale securities.
	We do not have any securities that are classified as trading securities.  Available-for-sale securities are reported at fair value, with unrealized gains and losses included as a separate component of shareholders' equity, net of tax.  If declines in fair value are other than temporary, the carrying value of the securities is written down to fair value as a realized loss with a charge to income for the portion attributable to credit losses and a charge to other comprehensive income for the portion that is not credit related.
	Gains or losses on disposition of securities are computed by specific identification for all securities except for shares in mutual funds, which are computed by average cost.  Interest and dividend income, adjusted by amortization of purchase premium or discount, is included in earnings.
	When the fair value of a security is below its amortized cost, and depending on the length of time the condition exists and the extent the fair market value is below amortized cost, additional analysis is performed to determine whether an other than temporary impairment condition exists.  Available-for-sale and held-to-maturity securities are analyzed quarterly for possible other than temporary impairment.  The analysis considers (i) whether we have the intent to sell our securities prior to recovery and/or maturity and (ii) whether it is more likely than not that we will not have to sell our securities prior to recovery and/or maturity.  Often, the information available to conduct these assessments is limited and rapidly changing, making estimates of fair value subject to judgment.  If actual information or conditions are different than estimated, the extent of the impairment of the security may be different than previously estimated, which could have a material effect on the CTBI's results of operations and financial condition.
Loans	Loans – Loans with the ability and the intent to be held until maturity and/or payoff are reported at the carrying value of unpaid principal reduced by unearned interest, an allowance for loan and lease losses, and unamortized deferred fees or costs.  Income is recorded on the level yield basis.  Interest accrual is discontinued when management believes, after considering economic and business conditions, collateral value, and collection efforts, that the borrower's financial condition is such that collection of interest is doubtful.  Any loan greater than 90 days past due must be well secured and in the process of collection to continue accruing interest.  Cash payments received on nonaccrual loans generally are applied against principal, and interest income is only recorded once principal recovery is reasonably assured.  Loans are not reclassified as accruing until principal and interest payments remain current for a period of time, generally six months, and future payments appear reasonably certain.  Included in certain loan categories of impaired loans are troubled debt restructurings that were classified as impaired.  A restructuring of a debt constitutes a troubled debt restructuring if the creditor for economic or legal reasons related to the debtor's financial difficulties grants a concession to the debtor that it would not otherwise consider.
	Loan origination and commitment fees and certain direct loan origination costs are deferred and the net amount amortized over the estimated life of the related loans, leases, or commitments as a yield adjustment.
Allowance for Loan and Lease Losses	Allowance for Loan and Lease Losses – We maintain an allowance for loan and lease losses ("ALLL") at a level that is appropriate to cover estimated credit losses on individually evaluated loans determined to be impaired, as well as estimated credit losses inherent in the remainder of the loan and lease portfolio.  Since arriving at an appropriate ALLL involves a high degree of management judgment, we use an ongoing quarterly analysis to develop a range of estimated losses.  In accordance with accounting principles generally accepted in the United States, we use our best estimate within the range of potential credit loss to determine the appropriate ALLL.  Credit losses are charged and recoveries are credited to the ALLL.
	We utilize an internal risk grading system for commercial credits.  Those larger commercial credits that exhibit probable or observed credit weaknesses are subject to individual review.  The borrower's cash flow, adequacy of collateral coverage, and other options available to CTBI, including legal remedies, are evaluated.  The review of individual loans includes those loans that are impaired as defined by ASC 310-35, Impairment of a Loan.  We evaluate the collectability of both principal and interest when assessing the need for loss provision.  Historical loss rates are analyzed and applied to other commercial loans not subject to specific allocations.  The ALLL allocation for this pool of commercial loans is established based on the historical average, maximum, minimum, and median loss ratios.
	A loan is considered impaired when, based on current information and events, it is probable that CTBI will be unable to collect the scheduled payments of principal or interest when due according to the contractual terms of the loan agreement.  Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and interest payments when due.  Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired.  Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower's prior payment record, and the amount of the shortfall in relation to the principal and interest owed.  Impairment is measured on a loan-by-loan basis for commercial and construction loans by either the present value of expected future cash flows discounted at the loan's effective interest rate, the loan's obtainable market price, or the fair value of the collateral if the loan is collateral dependent.
	Homogenous loans, such as consumer installment, residential mortgages, and home equity lines are not individually risk graded.  The associated ALLL for these loans is measured under ASC 450, Contingencies.
	When any secured commercial loan is considered uncollectable, whether past due or not, a current assessment of the value of the underlying collateral is made.  If the balance of the loan exceeds the fair value of the collateral, the loan is placed on non-accrual and the loan is charged down to the value of the collateral less estimated cost to sell or a specific reserve equal to the difference between book value of the loan and the fair value assigned to the collateral is created until such time as the loan is foreclosed.  When the foreclosed collateral has been legally assigned to CTBI, a charge off is taken, if necessary, in order that the remaining balance reflects the fair value estimated less costs to sell of the collateral then transferred to other real estate owned or other repossessed assets.  When any unsecured commercial loan is considered uncollectable the loan is charged off no later than at 90 days past due.
	All closed-end consumer loans (excluding conventional 1-4 family residential loans and installment and revolving loans secured by real estate) are charged off no later than 120 days (5 monthly payments) delinquent.  If a loan is considered uncollectable, it is charged off earlier than 120 days delinquent.  For conventional 1-4 family residential loans and installment and revolving loans secured by real estate, when a loan is 90 days past due, a current assessment of the value of the real estate is made.  If the balance of the loan exceeds the fair value of the property, the loan is placed on nonaccrual.  Foreclosure proceedings are normally initiated after 120 days.  When the foreclosed property has been legally assigned to CTBI, the fair value less estimated costs to sell is transferred to other real estate owned and the remaining balance is taken as a charge-off.
	Historical loss rates for loans are adjusted for significant factors that, in management's judgment, reflect the impact of any current conditions on loss recognition.  We continue to use twelve rolling quarters for our historical loss rate analysis.  Factors that we consider include delinquency trends, current economic conditions and trends, strength of supervision and administration of the loan portfolio, levels of underperforming loans, level of recoveries to prior year's charge-offs, trends in loan losses, industry concentrations and their relative strengths, amount of unsecured loans, and underwriting exceptions.  Based upon management's judgment, "best case," "worst case," and "most likely" scenarios are determined.  The total of each of these weighted factors is then applied against the applicable portion of the portfolio and the ALLL is adjusted accordingly to approximate the most likely scenario.  Management continually reevaluates the other subjective factors included in its ALLL analysis.
Loans Held for Sale	Loans Held for Sale – Mortgage loans originated and intended for sale in the secondary market are carried at the lower of cost or estimated market value in the aggregate.  Net unrealized losses, if any, are recognized by charges to income.  Gains and losses on loan sales are recorded in noninterest income.
Premises and Equipment	Premises and Equipment – Premises and equipment are stated at cost less accumulated depreciation and amortization.  Capital leases are included in premises and equipment at the capitalized amount less accumulated amortization.  Premises and equipment are evaluated for impairment on a quarterly basis.
	Depreciation and amortization are computed primarily using the straight-line method.  Estimated useful lives range up to 40 years for buildings, 2 to 10 years for furniture, fixtures, and equipment, and up to the lease term for leasehold improvements.  Capitalized leased assets are amortized on a straight-line basis over the lives of the respective leases.
Federal Home Loan Bank and Federal Reserve Stock	Federal Home Loan Bank and Federal Reserve Stock – CTB is a member of the Federal Home Loan Bank ("FHLB") system.  Members are required to own a certain amount of stock based on the level of borrowings and other factors and may invest on additional amounts.  FHLB stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on the ultimate recovery par value.  Both cash and stock dividends are reported as income.
	CTB is also a member of its regional Federal Reserve Bank.  Federal Reserve Bank stock is carried at cost, classified as a restricted security, and periodically evaluated for impairment based on the ultimate recovery par value.  Both cash and stock dividends are reported as income.
Other Real Estate Owned	Other Real Estate Owned – When foreclosed properties are acquired, appraisals are obtained and the properties are booked at the current market value less expected sales costs.  Additionally, periodic updated appraisals are obtained on unsold foreclosed properties.  When an updated appraisal reflects a market value below the current book value, a charge is booked to current earnings to reduce the property to its new market value less expected sales costs.  Our policy for determining the frequency of periodic reviews is based upon consideration of the specific properties and the known or perceived market fluctuations in a particular market and is typically between 12 and 18 months but generally not more than 24 months.  All revenues and expenses related to the carrying of other real estate owned are recognized by a charge to income.
Goodwill and Core Deposit Intangible	Goodwill and Core Deposit Intangible – We evaluate total goodwill and core deposit intangible for impairment, based upon ASC 350, Intangibles-Goodwill and Other, using fair value techniques including multiples of price/equity.  Goodwill and core deposit intangible are evaluated for impairment on an annual basis or as other events may warrant.
	The balance of goodwill, at $65.5 million, has not changed since January 1, 2012.  The activity to core deposit intangible for the years ended December 31, 2014, 2013, and 2012 is shown below.
	Core Deposit Intangible:
	(in thousands)	2014			2013			2012
	Beginning balance, January 1	$	690		$	904		$	1,117
	Amortization		(213	)		(214	)		(213	)
	Ending balance, December 31	$	477		$	690		$	904
	Amortization of core deposit intangible is estimated at approximately $0.2 million annually for years one and two and $0.1 million for year three, at which time core deposit intangible will be fully amortized.
Transfers of Financial Assets	Transfers of Financial Assets -- Transfers of financial assets are accounted for as sales, when control over the assets has been surrendered.  Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from CTBI—put presumptively beyond the reach of the transferor and its creditors, even in bankruptcy or other receivership, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) CTBI does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Income Taxes	Income Taxes – Income tax expense is based on the taxes due on the consolidated tax return plus deferred taxes based on the expected future tax benefits and consequences of temporary differences between carrying amounts and tax bases of assets and liabilities, using enacted tax rates.  Any interest and penalties incurred in connection with income taxes are recorded as a component of income tax expense in the consolidated financial statements.  During the years ended December 31, 2014, 2013, and 2012, CTBI has not recognized a significant amount of interest expense or penalties in connection with income taxes.
Earnings Per Share ("EPS")	Earnings Per Share ("EPS") – Basic EPS is calculated by dividing net income available to common shareholders by the weighted average number of common shares outstanding, excluding restricted shares.
	Diluted EPS adjusts the number of weighted average shares of common stock outstanding by the dilutive effect of stock options, including restricted shares, as prescribed in ASC 718, Share-Based Payment.
Segments	Segments – Management analyzes the operation of CTBI assuming one operating segment, community banking services.  CTBI, through its operating subsidiaries, offers a wide range of consumer and commercial community banking services.  These services include: (i) residential and commercial real estate loans; (ii) checking accounts; (iii) regular and term savings accounts and savings certificates; (iv) full service securities brokerage services; (v) consumer loans; (vi) debit cards; (vii) annuity and life insurance products; (viii) Individual Retirement Accounts and Keogh plans; (ix) commercial loans; (x) trust and wealth management services; and (xi) commercial demand deposit accounts.
Bank Owned Life Insurance	Bank Owned Life Insurance – CTBI's bank owned life insurance policies are carried at their cash surrender value.  We recognize tax-free income from the periodic increases in cash surrender value of these policies and from death benefits.
Mortgage Servicing Rights	Mortgage Servicing Rights – Mortgage servicing rights ("MSRs") are carried at fair market value following the accounting guidance in ASC 860-50, Servicing Assets and Liabilities.  MSRs are valued using Level 3 inputs as defined in ASC 820, Fair Value Measurements.  The fair value is determined quarterly based on an independent third-party valuation using a discounted cash flow analysis and calculated using a computer pricing model.  The system used in this evaluation, Compass Point, attempts to quantify loan level idiosyncratic risk by calculating a risk derived value.  As a result, each loan's unique characteristics determine the valuation assumptions ascribed to that loan.  Additionally, the computer valuation is based on key economic assumptions including the prepayment speeds of the underlying loans generated using the Andrew Davidson Prepayment Model, FHLMC/FNMA guidelines, the weighted-average life of the loan, the discount rate, the weighted-average coupon, and the weighted-average default rate, as applicable.  Along with the gains received from the sale of loans, fees are received for servicing loans.  These fees include late fees, which are recorded in interest income, and ancillary fees and monthly servicing fees, which are recorded in noninterest income.  Costs of servicing loans are charged to expense as incurred.  Changes in fair market value of the MSRs are reported as an increase or decrease to mortgage banking income.
Share-Based Compensation	Share-Based Compensation – CTBI has a share-based employee compensation plan, which is described more fully in note 14 to the consolidated financial statements.  CTBI accounts for this plan under the recognition and measurement principles of ASC 718, Share-Based Payment.
Comprehensive Income	Comprehensive Income – Comprehensive income consists of net income and other comprehensive income, net of applicable income taxes.  Other comprehensive income includes unrealized appreciation (depreciation) on available-for-sale securities and unrealized appreciation (depreciation) on available-for-sale securities for which a portion of an other than temporary impairment has been recognized in income.
Transfers between Fair Value Hierarchy Levels	Transfers between Fair Value Hierarchy Levels – Transfers in and out of Level 1 (quoted market prices), Level 2 (other significant observable inputs), and Level 3 (significant unobservable inputs) are recognized on the period ending date.
Reclassifications	Reclassifications – Certain reclassifications considered to be immaterial have been made in the prior year consolidated financial statements to conform to current year classifications.  These reclassifications had no effect on net income.
	On June 2, 2014, CTBI issued a 10% stock dividend to shareholders of record on May 15, 2014.  Based on the number of common shares outstanding on the record date, CTBI issued 1,582,137 new shares.  The fair market value of the additional shares issued, aggregating $52.3 million, was charged to retained earings, and common stock and additional paid-in capital were increased by $7.9 million and $44.4 million, respectively.  All references in the consolidated financial statements and accompanying footnotes to the number of common shares and per share amounts are based on the increased number of shares giving restrospective effect to the stock dividend.
New Accounting Standards	New Accounting Standards –
	Ø            Accounting for Investments in Qualified Affordable Housing Projects – In January 2014, the FASB issued ASU No. 2014-01, Investments—Equity Method and Joint Ventures (Topic 323):  Accounting for Investments in Qualified Affordable Housing Projects, which enables companies that invest in affordable housing projects that qualify for the low-income housing tax credit (LIHTC) to elect to use the proportional amortization method if certain conditions are met.  Under the proportional amortization method, the initial investment cost of the project is amortized in proportion to the amount of tax credits and benefits received, with the results of the investment presented on a net basis as a component of income tax expense (benefit).  ASU 2014-01 is effective for interim and annual periods beginning after December 15, 2014.  The adoption of this ASU is not expected to have a material impact on CTBI's consolidated financial statements.
	Ø            Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure – In January 2014, the FASB also issued ASU No. 2014-04, Receivables—Troubled Debt Restructurings by Creditors (Subtopic 310-40):  Reclassification of Residential Real Estate Collateralized Consumer Mortgage Loans upon Foreclosure, which clarifies when an in-substance foreclosure or repossession of residential real estate property occurs, requiring a creditor to reclassify the loan to other real estate.  According to ASU 2014-04, a consumer mortgage loan should be reclassified to other real estate either upon the creditor obtaining legal title to the real estate collateral or when the borrower voluntarily conveys all interest in the real estate property to the creditor through a deed in lieu of foreclosure or similar legal agreement.  ASU 2014-04 also clarifies that a creditor should not delay reclassification when a borrower has a legal right of redemption.  ASU 2014-04 is effective for interim and annual periods beginning after December 15, 2014.  The adoption of this ASU is not expected to have a material impact on CTBI's consolidated financial statements as our practice is already consistent with the new guidance.
	Ø            Elimination of Extraordinary Reporting – In January 2015, the FASB issued ASU No. 2015-01, Income Statement – Extraordinary and Unusual Items (Subtopic 225-20): Simplifying Income Statement Presentation by Eliminating the Concept of Extraordinary Items.  The FASB issued this ASU as part of its initiative to reduce complexity in accounting standards.  The objective of the simplification initiative is to identify, evaluate, and improve areas of U.S. GAAP for which cost and complexity can be reduced while maintaining or improving the usefulness of the information provided to the users of financial statements.  The amendments in this ASU are effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015.  A reporting entity may apply the amendments prospectively.  A reporting entity also may apply the amendments retrospectively to all prior periods presented in the financial statements.  Early adoption is permitted provided that the guidance is applied from the beginning of the fiscal year of adoption.  The effective date is the same for both public business entities and all other entities.  For an entity that prospectively applies the guidance, the only required transition disclosure will be to disclose, if applicable, both the nature and the amount of an item included in income from continuing operations after adoption that adjusts an extraordinary item previously classified and presented before the date of adoption.  An entity retrospectively applying the guidance should provide the disclosures in paragraphs 250-10-50-1 through 50-2.

Accounting_Policies_Tables

Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2014
Accounting Policies [Abstract]
Activity to Core Deposit Intangible	The activity to core deposit intangible for the years ended December 31, 2014, 2013, and 2012 is shown below.
	Core Deposit Intangible:
	(in thousands)	2014			2013			2012
	Beginning balance, January 1	$	690		$	904		$	1,117
	Amortization		(213	)		(214	)		(213	)
	Ending balance, December 31	$	477		$	690		$	904

Securities_Tables

Securities (Tables)	12 Months Ended
	Dec. 31, 2014
Securities [Abstract]
Amortized Cost and Fair Value of Securities	The amortized cost and fair value of securities at December 31, 2014 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	$	190,563	$	509		$	(2,140	)	$	188,932
	State and political subdivisions		133,951		3,973			(466	)		137,458
	U.S. government sponsored agency mortgage-backed securities		288,881		2,876			(2,850	)		288,907
	Total debt securities		613,395		7,358			(5,456	)		615,297
	Marketable equity securities		25,000		0			(111	)		24,889
	Total available-for-sale securities	$	638,395	$	7,358		$	(5,567	)	$	640,186
	Held-to-Maturity
	(in thousands)	Amortized Cost		Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury and government agencies	$	480	$	0		$	(19	)	$	461
	State and political subdivisions		1,182		1			0			1,183
	Total held-to-maturity securities	$	1,662	$	1		$	(19	)	$	1,644
	The amortized cost and fair value of securities at December 31, 2013 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	$	77,838	$	277		$	(5,492	)	$	72,623
	State and political subdivisions		118,055		1,907			(3,259	)		116,703
	U.S. government sponsored agency mortgage-backed securities		370,860		4,273			(7,836	)		367,297
	Total debt securities		566,753		6,457			(16,587	)		556,623
	Marketable equity securities		55,000		0			(2,218	)		52,782
	Total available-for-sale securities	$	621,753	$	6,457		$	(18,805	)	$	609,405
	Held-to-Maturity
	(in thousands)	Amortized Cost		Gross Unrealized Gains			Gross Unrealized Losses			Fair Value
	U.S. Treasury and government agencies	$	480	$	0		$	(62	)	$	418
	State and political subdivisions		1,182		1			0			1,183
	Total held-to-maturity securities	$	1,662	$	1		$	(62	)	$	1,601
Amortized Cost and Fair Value of Securities by Contractual Maturity	The amortized cost and fair value of securities at December 31, 2014 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	$	9,153	$	9,193		$	0		$	0
	Due after one through five years		124,725		125,444			0			0
	Due after five through ten years		141,407		141,625			1,662			1,644
	Due after ten years		49,229		50,128			0			0
	U.S. government sponsored agency mortgage-backed securities		288,881		288,907			0			0
	Total debt securities		613,395		615,297			1,662			1,644
	Marketable equity securities		25,000		24,889			0			0
	Total securities	$	638,395	$	640,186		$	1,662		$	1,644
Amortized Cost, Gross Unrealized Losses, and Fair Market Value of Securities in Continuous Unrealized Loss Position	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, 2014 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	$	31,185	$	(87	)	$	31,098
	State and political subdivisions		8,800		(23	)		8,777
	U.S. government sponsored agency mortgage-backed securities		50,115		(442	)		49,673
	Total debt securities		90,100		(552	)		89,548
	Marketable equity securities		25,000		(111	)		24,889
	Total <12 months temporarily impaired AFS securities		115,100		(663	)		114,437
	12 Months or More
	U.S. Treasury and government agencies		65,209		(2,053	)		63,156
	State and political subdivisions		21,308		(443	)		20,865
	U.S. government sponsored agency mortgage-backed securities		86,389		(2,408	)		83,981
	Total debt securities		172,906		(4,904	)		168,002
	Marketable equity securities		0		0			0
	Total ≥12 months temporarily impaired AFS securities		172,906		(4,904	)		168,002
	Total
	U.S. Treasury and government agencies		96,394		(2,140	)		94,254
	State and political subdivisions		30,108		(466	)		29,642
	U.S. government sponsored agency mortgage-backed securities		136,504		(2,850	)		133,654
	Total debt securities		263,006		(5,456	)		257,550
	Marketable equity securities		25,000		(111	)		24,889
	Total temporarily impaired AFS securities	$	288,006	$	(5,567	)	$	282,439
	Held-to-Maturity
	(in thousands)	Amortized Cost		Gross Unrealized Losses			Fair Value
	12 Months or More
	U.S. Treasury and government agencies	$	480	$	(19	)	$	461
	Total temporarily impaired HTM securities	$	480	$	(19	)	$	461
	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, 2013 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	$	31,631	$	(1,970	)	$	29,661
	State and political subdivisions		57,165		(2,789	)		54,376
	U.S. government sponsored agency mortgage-backed securities		238,824		(7,829	)		230,995
	Total debt securities		327,620		(12,588	)		315,032
	Marketable equity securities		55,000		(2,218	)		52,782
	Total <12 months temporarily impaired AFS securities		382,620		(14,806	)		367,814
	12 Months or More
	U.S. Treasury and government agencies		35,750		(3,522	)		32,228
	State and political subdivisions		7,639		(470	)		7,169
	U.S. government sponsored agency mortgage-backed securities		6,579		(7	)		6,572
	Total debt securities		49,968		(3,999	)		45,969
	Marketable equity securities		0		0			0
	Total ≥12 months temporarily impaired AFS securities		49,968		(3,999	)		45,969
	Total
	U.S. Treasury and government agencies		67,381		(5,492	)		61,889
	State and political subdivisions		64,804		(3,259	)		61,545
	U.S. government sponsored agency mortgage-backed securities		245,403		(7,836	)		237,567
	Total debt securities		377,588		(16,587	)		361,001
	Marketable equity securities		55,000		(2,218	)		52,782
	Total temporarily impaired AFS securities	$	432,588	$	(18,805	)	$	413,783
	Held-to-Maturity
	(in thousands)	Amortized Cost		Gross Unrealized Losses			Fair Value
	12 Months or More
	U.S. Treasury and government agencies	$	480	$	(62	)	$	418
	Total temporarily impaired HTM securities	$	480	$	(62	)	$	418

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2014
Loans [Abstract]
Summary of Major Classification of Loans Net of Unearned Income and Deferred Loan Origination Cost	Major classifications of loans, net of unearned income, deferred loan origination costs, and net premiums on acquired loans, are summarized as follows:
		31-Dec		31-Dec
	(in thousands)	2014		2013
	Commercial construction	$	121,942	$	110,779
	Commercial secured by real estate		948,626		872,542
	Equipment lease financing		10,344		8,840
	Commercial other		352,048		374,881
	Real estate construction		62,412		56,075
	Real estate mortgage		712,465		697,601
	Home equity		88,335		84,880
	Consumer direct		122,136		122,215
	Consumer indirect		315,516		287,541
	Total loans	$	2,733,824	$	2,615,354
Nonaccrual Loans Segregated by Class of Loans	Nonaccrual loans segregated by class of loans were as follows:
	(in thousands)	31-Dec		31-Dec
		2014		2013
	Commercial:
	Commercial construction	$	4,339	$	4,519
	Commercial secured by real estate		6,725		6,576
	Commercial other		2,423		2,801
	Residential:
	Real estate construction		602		481
	Real estate mortgage		6,513		5,152
	Home equity		369		429
	Total nonaccrual loans	$	20,971	$	19,958
Loan Portfolio Aging Analysis, Segregated by Class	The following tables present CTBI's loan portfolio aging analysis, segregated by class, as of December 31, 2014 and 2013:
		31-Dec-14
	(in thousands)	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Past Due		Current		Total Loans		90+ and Accruing*
	Commercial:
	Commercial construction	$	40	$	31	$	6,171	$	6,242	$	115,700	$	121,942	$	1,863
	Commercial secured by real estate		2,471		1,595		10,763		14,829		933,797		948,626		4,682
	Equipment lease financing		0		0		0		0		10,344		10,344		0
	Commercial other		826		55		4,205		5,086		346,962		352,048		2,367
	Residential:
	Real estate construction		92		144		985		1,221		61,191		62,412		383
	Real estate mortgage		1,005		5,171		13,049		19,225		693,240		712,465		7,742
	Home equity		779		197		703		1,679		86,656		88,335		422
	Consumer:
	Consumer direct		1,307		295		141		1,743		120,393		122,136		141
	Consumer indirect		2,304		586		385		3,275		312,241		315,516		385
	Total	$	8,824	$	8,074	$	36,402	$	53,300	$	2,680,524	$	2,733,824	$	17,985
		31-Dec-13
	(in thousands)	30-59 Days Past Due		60-89 Days Past Due		90+ Days Past Due		Total Past Due		Current		Total Loans		90+ and Accruing*
	Commercial:
	Commercial construction	$	250	$	166	$	6,012	$	6,428	$	104,351	$	110,779	$	1,673
	Commercial secured by real estate		3,703		1,982		16,660		22,345		850,197		872,542		12,403
	Equipment lease financing		0		0		0		0		8,840		8,840		0
	Commercial other		344		422		6,156		6,922		367,959		374,881		3,723
	Residential:
	Real estate construction		81		383		694		1,158		54,917		56,075		213
	Real estate mortgage		1,274		4,419		9,346		15,039		682,562		697,601		4,847
	Home equity		786		330		737		1,853		83,027		84,880		324
	Consumer:
	Consumer direct		1,063		291		119		1,473		120,742		122,215		119
	Consumer indirect		2,750		668		297		3,715		283,826		287,541		297
	Total	$	10,251	$	8,661	$	40,021	$	58,933	$	2,556,421	$	2,615,354	$	23,599
	*90+ and Accruing are also included in 90+ Days Past Due column.
Credit Risk Profile of the Bank's Commercial Loan Portfolio Based on Rating Category and Payment Activity, Segregated by Class of Loans	The following tables present the credit risk profile of CTBI's commercial loan portfolio based on rating category and payment activity, segregated by class of loans, as of December 31, 2014 and 2013:
	(in thousands)	Commercial Construction		Commercial Secured by Real Estate		Equipment Leases		Commercial Other		Total
	31-Dec-14
	Pass	$	101,314	$	834,751	$	10,344	$	307,270	$	1,253,679
	Watch		9,857		69,123		0		36,114		115,094
	OAEM		934		10,973		0		881		12,788
	Substandard		5,647		27,901		0		5,772		39,320
	Doubtful		4,190		5,878		0		2,011		12,079
	Total	$	121,942	$	948,626	$	10,344	$	352,048	$	1,432,960
	31-Dec-13
	Pass	$	85,699	$	746,202	$	8,840	$	321,818	$	1,162,559
	Watch		13,519		77,561		0		32,800		123,880
	OAEM		0		6,639		0		6,200		12,839
	Substandard		7,208		37,334		0		11,772		56,314
	Doubtful		4,353		4,806		0		2,291		11,450
	Total	$	110,779	$	872,542	$	8,840	$	374,881	$	1,367,042
Credit Risk Profile of Residential Real Estate and Consumer Loan Portfolio Based on Performing and Nonperforming Status Segregated by Class	The following tables present the credit risk profile of CTBI's residential real estate and consumer loan portfolios based on performing or nonperforming status, segregated by class, as of December 31, 2014 and 2013:
	(in thousands)	Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer		Total
										Indirect
	31-Dec-14
	Performing	$	61,427	$	698,210	$	87,544	$	121,995	$	315,131	$	1,284,307
	Nonperforming (1)		985		14,255		791		141		385		16,557
	Total	$	62,412	$	712,465	$	88,335	$	122,136	$	315,516	$	1,300,864
	31-Dec-13
	Performing	$	55,381	$	687,602	$	84,127	$	122,096	$	287,244	$	1,236,450
	Nonperforming (1)		694		9,999		753		119		297		11,862
	Total	$	56,075	$	697,601	$	84,880	$	122,215	$	287,541	$	1,248,312
	(1)  A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.
Impaired Loans, Average Investment in Impaired Loans, and Interest Income Recognized on Impaired Loans	The following table presents impaired loans, the average investment in impaired loans, and interest income recognized on impaired loans for the years ended December 31, 2014, 2013, and 2012:
		31-Dec-14
	(in thousands)	Recorded Balance		Unpaid Contractual Principal Balance		Specific Allowance		Average Investment in Impaired Loans		*Interest Income Recognized
	Loans without a specific valuation allowance:
	Commercial construction	$	5,653	$	5,654	$	0	$	5,415	$	205
	Commercial secured by real estate		31,639		33,268		0		34,650		1,180
	Commercial other		13,069		14,597		0		15,663		783
	Real estate mortgage		1,277		1,277		0		1,507		53
	Loans with a specific valuation allowance:
	Commercial construction		3,974		3,974		734		4,216		0
	Commercial secured by real estate		2,718		2,876		827		4,376		11
	Commercial other		738		862		181		531		1
	Totals:
	Commercial construction		9,627		9,628		734		9,631		205
	Commercial secured by real estate		34,357		36,144		827		39,026		1,191
	Commercial other		13,807		15,459		181		16,194		784
	Real estate mortgage		1,277		1,277		0		1,507		53
	Total	$	59,068	$	62,508	$	1,742	$	66,358	$	2,233
		31-Dec-13
	(in thousands)	Recorded Balance		Unpaid Contractual Principal Balance		Specific Allowance		Average Investment in Impaired Loans		*Interest Income Recognized
	Loans without a specific valuation allowance:
	Commercial construction	$	5,457	$	5,458	$	0	$	5,595	$	240
	Commercial secured by real estate		35,258		36,173		0		32,472		1,231
	Commercial other		14,839		16,435		0		15,396		568
	Real estate mortgage		1,024		1,024		0		934		43
	Loans with a specific valuation allowance:
	Commercial construction		4,353		4,359		1,189		4,935		0
	Commercial secured by real estate		4,039		4,326		1,005		5,033		1
	Commercial other		330		453		102		525		0
	Totals:
	Commercial construction		9,810		9,817		1,189		10,530		240
	Commercial secured by real estate		39,297		40,499		1,005		37,505		1,232
	Commercial other		15,169		16,888		102		15,921		568
	Real estate mortgage		1,024		1,024		0		934		43
	Total	$	65,300	$	68,228	$	2,296	$	64,890	$	2,083
		31-Dec-12
	(in thousands)	Recorded Balance		Unpaid Contractual Principal Balance		Specific Allowance		Average Investment in Impaired Loans		*Interest Income Recognized
	Loans without a specific valuation allowance:
	Commercial construction	$	3,692	$	4,146	$	0	$	4,249	$	97
	Commercial secured by real estate		35,046		35,818		0		35,542		1,337
	Commercial other		13,285		15,484		0		11,083		416
	Real estate mortgage		695		695		0		481		30
	Loans with a specific valuation allowance:
	Commercial construction		5,703		6,933		1,820		6,585		0
	Commercial secured by real estate		3,067		3,189		1,090		3,243		0
	Commercial other		1,010		2,331		338		1,441		0
	Commercial construction		9,395		11,079		1,820		10,834		97
	Commercial secured by real estate		38,113		39,007		1,090		38,785		1,337
	Commercial other		14,295		17,815		338		12,524		416
	Real estate mortgage		695		695		0		481		30
	Total	$	62,498	$	68,596	$	3,248	$	62,624	$	1,880
	*Cash basis interest is substantially the same as interest income recognized.
Troubled Debt Restructurings	Presented below, segregated by class of loans, are troubled debt restructurings that occurred during the years ended December 31, 2014 and 2013:
		Year Ended
		31-Dec-14
	(in thousands)	Number of Loans		Term Modification		Rate Modification		Combination		Post-Modification Outstanding Balance
	Commercial:
	Commercial construction		1	$	7	$	0	$	0	$	7
	Commercial secured by real estate		11		5,707		0		68		5,775
	Commercial other		8		1,268		0		0		1,268
	Residential:
	Real estate mortgage		2		0		0		848		848
	Total troubled debt restructurings		22	$	6,982	$	0	$	916	$	7,898
		Year Ended
		31-Dec-13
	(in thousands)	Number of Loans		Term Modification		Rate Modification		Combination		Post-Modification Outstanding Balance
	Commercial:
	Commercial construction		6	$	2,603	$	0	$	0	$	2,603
	Commercial secured by real estate		27		2,568		0		2,920		5,488
	Commercial other		30		6,471		0		152		6,623
	Residential:
	Real estate mortgage		1		373		0		0		373
	Total troubled debt restructurings		64	$	12,015	$	0	$	3,072	$	15,087
Summary of Defaulted Restructured Loans	Presented below, segregated by class of loans, are loans that were modified as troubled debt restructurings within the past twelve months which have subsequently defaulted.  CTBI considers a loan in default when it is 90 days or more past due or transferred to nonaccrual.
	(in thousands)	Year Ended
		31-Dec-14
		Number of Loans		Recorded Balance
	Commercial:
	Commercial other		1		88
	Residential:
	Real estate mortgage		1		581
	Total defaulted restructured loans		2	$	669
	(in thousands)	Year Ended
		31-Dec-13
		Number of Loans		Recorded Balance
	Commercial:
	Commercial secured by real estate		2	$	89
	Commercial other		6		596
	Residential:
	Real estate mortgage		1		373
	Total defaulted restructured loans		9	$	1,058

Mortgage_Banking_and_Servicing1

Mortgage Banking and Servicing Rights (Tables)	12 Months Ended
	Dec. 31, 2014
Mortgage Banking and Servicing Rights [Abstract]
Components of Mortgage Banking Income	The following table presents the components of mortgage banking income:
	(in thousands)		2014			2013			2012
	Year Ended December 31
	Net gain on sale of loans held for sale		$	1,468		$	3,098		$	2,562
	Net loan servicing income (expense)
	Servicing fees			1,129			1,121			1,083
	Late fees			112			98			83
	Ancillary fees			149			368			382
	Fair value adjustments			(830	)		206			(559	)
	Net loan servicing income			560			1,793			989
	Mortgage banking income		$	2,028		$	4,891		$	3,551
Activity for Capitalized Mortgage Servicing Rights Using Fair Value Method	Activity for capitalized mortgage servicing rights using the fair value method is as follows:
	(in thousands)		2014			2013			2012
	Fair value of MSRs, beginning of period		$	3,424		$	2,364		$	2,282
	New servicing assets created			374			854			641
	Change in fair value during the period due to:
	Time decay (1)			(162	)		(159	)		(116	)
	Payoffs (2)			(202	)		(423	)		(478	)
	Changes in valuation inputs or assumptions (3)			(466	)		788			35
	Fair value of MSRs, end of period		$	2,968		$	3,424		$	2,364
	-1	Represents decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.
	-2	Represents decrease in value due to loans that paid off during the period.
	-3	Represents change in value resulting from market-driven changes in interest rates.

Related_Party_Transactions_Tab

Related Party Transactions (Tables)	12 Months Ended
	Dec. 31, 2014
Related Party Transactions [Abstract]
Activity for Related Party Transactions	Activity for related party extensions of credit during 2014 and 2013 is as follows:
	(in thousands)	2014			2013
	Related party extensions of credit, beginning of period	$	33,103		$	33,038
	New loans and advances on lines of credit		5,500			8,305
	Repayments		(1,281	)		(8,237	)
	Increase (decrease) due to changes in related parties		151			(3	)
	Related party extensions of credit, end of period	$	37,473		$	33,103

Allowance_for_Loan_and_Lease_L1

Allowance for Loan and Lease Losses (Tables)	12 Months Ended
	Dec. 31, 2014
Allowance for Loan and Lease Losses [Abstract]
Allowance for Loan and Lease Losses and Recorded Investment in Loans Based on Portfolio Segment and Impairment Method	The following tables present the balance in the allowance for loan and lease losses ("ALLL") and the recorded investment in loans based on portfolio segment and impairment method as of December 31, 2014, 2013, and 2012:
	2014
	(in thousands)	Commercial Construction			Commercial Secured by Real Estate		Equipment Lease Financing			Commercial Other		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer Indirect			Total
	ALLL
	Balance, beginning of year	$	3,396		$	14,535	$	121		$	5,238	$	397	$	4,939	$	601	$	1,127	$	3,654		$	34,008
	Provision charged to expense		(513	)		941		(2	)		1,545		258		2,173		265		1,207		2,881			8,755
	Losses charged off		15			2,163		0			3,141		123		1,058		115		1,326		3,495			11,436
	Recoveries		28			305		0			621		2		40		5		566		1,553			3,120
	Balance, end of year	$	2,896		$	13,618	$	119		$	4,263	$	534	$	6,094	$	756	$	1,574	$	4,593		$	34,447
	Ending balance:
	Individually evaluated for impairment	$	734		$	827	$	0		$	181	$	0	$	0	$	0	$	0	$	0		$	1,742
	Collectively evaluated for impairment	$	2,162		$	12,791	$	119		$	4,082	$	534	$	6,094	$	756	$	1,574	$	4,593		$	32,705
	Loans
	Ending balance:
	Individually evaluated for impairment	$	9,627		$	34,357	$	0		$	13,807	$	0	$	1,277	$	0	$	0	$	0		$	59,068
	Collectively evaluated for impairment	$	112,315		$	914,269	$	10,344		$	338,241	$	62,412	$	711,188	$	88,335	$	122,136	$	315,516		$	2,674,756
	2013
	(in thousands)	Commercial Construction			Commercial Secured by Real Estate		Equipment Lease Financing			Commercial Other		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer Indirect			Total
	ALLL
	Balance, beginning of year	$	4,033		$	13,541	$	126		$	5,469	$	376	$	4,767	$	563	$	1,102	$	3,268		$	33,245
	Provision charged to expense		189			2,438		(5	)		1,477		106		860		268		696		2,539			8,568
	Losses charged off		1,135			1,607		0			2,265		89		744		241		1,166		3,802			11,049
	Recoveries		309			163		0			557		4		56		11		495		1,649			3,244
	Balance, end of year	$	3,396		$	14,535	$	121		$	5,238	$	397	$	4,939	$	601	$	1,127	$	3,654		$	34,008
	Ending balance:
	Individually evaluated for impairment	$	1,189		$	1,005	$	0		$	102	$	0	$	0	$	0	$	0	$	0		$	2,296
	Collectively evaluated for impairment	$	2,207		$	13,530	$	121		$	5,136	$	397	$	4,939	$	601	$	1,127	$	3,654		$	31,712
	Loans
	Ending balance:
	Individually evaluated for impairment	$	9,810		$	39,297	$	0		$	15,169	$	0	$	1,024	$	0	$	0	$	0		$	65,300
	Collectively evaluated for impairment	$	100,969		$	833,245	$	8,840		$	359,712	$	56,075	$	696,577	$	84,880	$	122,215	$	287,541		$	2,550,054
	2012
	(in thousands)	Commercial Construction			Commercial Secured by Real Estate		Equipment Lease Financing			Commercial Other		Real Estate Construction		Real Estate Mortgage		Home Equity		Consumer Direct		Consumer Indirect			Total
	ALLL
	Balance, beginning of year	$	4,023		$	11,753	$	112		$	5,608	$	354	$	4,302	$	562	$	917	$	5,540		$	33,171
	Provision charged to expense		1,009			3,520		14			2,330		183		1,437		238		892		(173	)		9,450
	Losses charged off		1,034			2,035		0			3,233		189		1,123		248		1,245		3,483			12,590
	Recoveries		35			303		0			764		28		151		11		538		1,384			3,214
	Balance, end of year	$	4,033		$	13,541	$	126		$	5,469	$	376	$	4,767	$	563	$	1,102	$	3,268		$	33,245
	Ending balance:
	Individually evaluated for impairment	$	1,820		$	1,090	$	0		$	338	$	0	$	0	$	0	$	0	$	0		$	3,248
	Collectively evaluated for impairment	$	2,213		$	12,451	$	126		$	5,131	$	376	$	4,767	$	563	$	1,102	$	3,268		$	29,997
	Loans
	Ending balance:
	Individually evaluated for impairment	$	9,395		$	38,113	$	0		$	14,295	$	0	$	695	$	0	$	0	$	0		$	62,498
	Collectively evaluated for impairment	$	110,052		$	769,100	$	9,246		$	362,053	$	55,041	$	696,233	$	82,292	$	122,581	$	281,477		$	2,488,075

Premises_and_Equipment_Tables

Premises and Equipment (Tables)	12 Months Ended
	Dec. 31, 2014
Premises and Equipment [Abstract]
Schedule of Premises and Equipment	Premises and equipment are summarized as follows:
	(in thousands)	2014			2013
	31-Dec
	Land and buildings	$	76,795		$	76,313
	Leasehold improvements		4,760			4,778
	Furniture, fixtures, and equipment		34,234			32,237
	Construction in progress		227			971
	Total premises and equipment		116,016			114,299
	Less accumulated depreciation and amortization		(66,036	)		(62,299	)
	Premises and equipment, net	$	49,980		$	52,000

Other_Real_Estate_Owned_Tables

Other Real Estate Owned (Tables)	12 Months Ended
	Dec. 31, 2014
Other Real Estate Owned [Abstract]
Activity for Other Real Estate Owned	Activity for other real estate owned was as follows:
	(in thousands)	2014			2013
	Beginning balance of other real estate owned	$	39,188		$	47,537
	New assets acquired		12,199			7,429
	Capitalized costs		0			6
	Fair value adjustments		(1,730	)		(2,480	)
	Sale of assets		(12,881	)		(13,304	)
	Ending balance of other real estate owned	$	36,776		$	39,188

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2014
Deposits [Abstract]
Major Classifications of Deposits	Major classifications of deposits are categorized as follows:
	(in thousands)	2014		2013
	31-Dec
	Noninterest bearing deposits	$	677,626	$	621,321
	NOW accounts		31,998		31,017
	Money market deposits		577,677		554,072
	Savings		348,038		320,835
	Certificates of deposit and other time deposits of $100,000 or more		619,887		660,016
	Certificates of deposit and other time deposits less than $100,000		619,031		667,813
	Total deposits	$	2,874,257	$	2,855,074
Schedule of Interest Expense on Deposits	Interest expense on deposits is categorized as follows:
	(in thousands)	2014		2013		2012
	Savings, NOW, and money market accounts	$	2,141	$	2,281	$	2,894
	Certificates of deposit and other time deposits of $100,000 or more		4,265		4,863		7,378
	Certificates of deposit and other time deposits less than $100,000		3,392		4,169		7,639
	Total interest expense on deposits	$	9,798	$	11,313	$	17,911
Maturities of Certificates of Deposits and Other Time Deposits	Maturities of certificates of deposits and other time deposits are presented below:
		Maturities by Period at December 31, 2014
	(in thousands)	Total		Within 1 Year		2 Years		3 Years		4 Years		5 Years		After 5 Years
	Certificates of deposit and other time deposits of $100,000 or more	$	619,887	$	518,045	$	48,833	$	24,280	$	14,070	$	14,559	$	100
	Certificates of deposit and other time deposits less than $100,000		619,031		536,074		40,225		18,219		12,894		11,275		344
	Total maturities	$	1,238,918	$	1,054,119	$	89,058	$	42,499	$	26,964	$	25,834	$	444

Advances_from_Federal_Home_Loa1

Advances from Federal Home Loan Bank (Tables)	12 Months Ended
	Dec. 31, 2014
Advances from Federal Home Loan Bank [Abstract]
Schedule of Federal Home Loan Bank Advances	Federal Home Loan Bank advances consisted of the following monthly amortizing and term borrowings at December 31:
	(in thousands)	2014		2013
	Monthly amortizing	$	1,170	$	1,286
	Term		60,000		0
	Total FHLB advances	$	61,170	$	1,286
Advances from Federal Home Loan Bank Requiring Monthly Principal Payment Basis	The advances from the FHLB that require monthly principal payments were due for repayment as follows:
		Principal Payments Due by Period at December 31, 2014
	(in thousands)	Total		Within 1 Year		2 Years		3 Years		4 Years		5 Years		After 5 Years
	Outstanding advances, weighted average interest rate – 1.70%	$	1,170	$	123	$	111	$	98	$	404	$	20	$	414
Schedule of Federal Home Loan Bank, Term Advances	The term advances that require the total payment to be made at maturity follow:
	(in thousands)	2014		2013
	31-Dec
	Advance #275, 0.17%, due 1/05/15	$	60,000	$	0
	Total term advances	$	60,000	$	0

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2014
Borrowings [Abstract]
Schedule of Short-term Debt	Short-term debt is categorized as follows:
	(in thousands)	2014		2013
	31-Dec
	Repurchase agreements	$	235,186	$	208,067
	Federal funds purchased		11,041		12,465
	Total short-term debt	$	246,227	$	220,532
Schedule of Long-term Debt	Long-term debt is categorized as follows:
	(in thousands)	2014		2013
	31-Dec
	Junior subordinated debentures, 1.83%, due 6/1/37	$	61,341	$	61,341

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2014
Income Taxes [Abstract]
Components of Provision for Income Taxes	The components of the provision for income taxes, exclusive of tax effect of unrealized securities gains and losses, are as follows:
	(in thousands)	2014			2013			2012
	Current income tax expense	$	20,194		$	19,418		$	14,784
	Deferred income tax expense (benefit)		(1,048	)		582			5,441
	Total income tax expense	$	19,146		$	20,000		$	20,225
Reconciliation of Income Tax Expense at Statutory Rate to Actual Income Tax Expense	A reconciliation of income tax expense at the statutory rate to our actual income tax expense is shown below:
	(in thousands)	2014						2013					2012
	Computed at the statutory rate	$	21,839			35	%	$	22,810		35	%	$	22,781		35	%
	Adjustments resulting from:
	Tax-exempt interest		(1,204	)		(1.93	)		(1,126	)	(1.73	)		(1,278	)	(1.96	)
	Housing and new markets credits		(1,076	)		(1.72	)		(996	)	(1.52	)		(704	)	(1.08	)
	Dividends received deduction		(178	)		(0.29	)		(291	)	(0.45	)		(202	)	(0.31	)
	Bank owned life insurance		(503	)		(0.81	)		(791	)	(1.22	)		(470	)	(0.72	)
	ESOP dividend deduction		(284	)		(0.46	)		(281	)	(0.43	)		(271	)	(0.42	)
	Other, net		552			0.88			675		1.04			369		0.56
	Total	$	19,146			30.68	%	$	20,000		30.69	%	$	20,225		31.07	%
Components of Net Deferred Tax Liability	The components of the net deferred tax liability as of December 31 are as follows:
	(in thousands)	2014			2013
	Deferred tax assets:
	Allowance for loan and lease losses	$	12,019		$	11,820
	Interest on nonperforming loans		1,039			732
	Accrued expenses		1,911			3,370
	Allowance for other real estate owned		1,901			2,232
	Unrealized losses on AFS securities		0			3,717
	Other		1,145			232
	Total deferred tax assets		18,015			22,103
	Deferred tax liabilities:
	Depreciation and amortization		(19,181	)		(18,717	)
	FHLB stock dividends		(3,460	)		(4,956	)
	Loan fee income		(744	)		(724	)
	Mortgage servicing rights		(1,039	)		(1,198	)
	Capitalized lease obligations		(681	)		(1,145	)
	Unrealized gains on AFS securities		(1,231	)		0
	Other		(1,171	)		(1,015	)
	Total deferred tax liabilities		(27,507	)		(27,755	)
	Net deferred tax liability	$	(9,492	)	$	(5,652	)

Employee_Benefits_Tables

Employee Benefits (Tables)	12 Months Ended
	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Shares to be Issued and Remaining Shares Available for Future Issuance	The following table provides detail of the number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance under all of CTBI's equity compensation plans as of December 31, 2014:
	Plan Category (shares in thousands)		Number of Shares to Be Issued Upon Exercise			Weighted Average Price			Shares Available for Future Issuance
	Equity compensation plans approved by shareholders:
	Stock options		143			$31.47			1,564 (a)
	Restricted stock		(c)			(b)			(a)
	Performance units		(d)			(b)			(a)
	Stock appreciation rights ("SARs")		(e)			(b)			(a)
	Total								1,564
	(a)	Under the 2006 Plan, 1.65 million shares (plus any shares reserved for issuance under the 1998 Stock Option Plan) were authorized for issuance as nonqualified and incentive stock options, SARS, restricted stock and performance units.  As of December 31, 2014, the above shares remained available for issuance.
	(b)	Not applicable
	(c)	The maximum number of shares of restricted stock that may be granted is 440,000 shares, and the maximum that may be granted to a participant during any calendar year is 44,000 shares.
	(d)	No performance units payable in stock had been issued as of December 31, 2014.  The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $250,000.
	(e)	No SARS have been issued.  The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year shall be 110,000 shares.
	The following table details the shares available for future issuance under the 2006 Plan at December 31, 2014.
	Plan Category	Shares Available for Future Issuance
	Shares available at January 1, 2014	1,573,980
	1998 Plan forfeitures in 2014	0
	2006 Plan stock option issuances for 2014	-10,000
	2006 Plan restricted stock issuances in 2014	-4,561
	2006 Plan forfeitures in 2014	4,283
	Shares available for future issuance	1,563,702
Schedule of Weighted Average Assumptions Used for Estimating Grant-Date Fair Value of Each Option Grant	CTBI uses a Black-Scholes option pricing model with the following weighted average assumptions, which are evaluated and revised as necessary, in estimating the grant-date fair value of each option grant for the year end:
		2014	2013	2012
	Expected option life (in years)	7	7.5	--
	Expected volatility	30.77%	39.11%	--
	Expected dividend yield	3.40%	3.74%	--
	Risk-free interest rate	2.01%	1.33%	--
Schedule of Restricted Stock Activity	The following table shows restricted stock activity for the years ended December 31, 2014, 2013, and 2012:
	31-Dec		2014							2013					2012
			Grants				Weighted Average Fair			Grants			Weighted Average Fair		Grants			Weighted Average Fair
							Value at Grant						Value at Grant					Value at Grant
	Outstanding at beginning of year			107,511			$	25.91			106,561		$	25.38		106,197		$	25.37
	Granted			4,561				37.85			11,904			30.64		364			28.11
	Vested			(8,949	)			28.35			(10,954	)		25.87		0			--
	Forfeited			(1,814	)			28.38			0			--		0			--
	Outstanding at end of year			101,309			$	26.19			107,511		$	25.91		106,561		$	25.38
Unrecognized Compensation Cost, Grant-Date Fair Value of Shares Vested, Cash Received from Option Exercises and Actual Tax Benefit Realized for Tax Deductions from Option Exercises	The following table shows the unrecognized compensation cost related to nonvested share-based compensation arrangements granted under the plans at December 31, 2014, 2013, and 2012 and the total grant-date fair value of shares vested, cash received from option exercises under all share-based payment arrangements, and the actual tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the years ended December 31, 2014, 2013, and 2012.
	(in thousands)		2014				2013			2012
	Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end		$	861			$	1,366		$	1,133
	Grant date fair value of shares vested for the year			343				521			34
	Cash received from option exercises under all share-based payment arrangements for the year			1,163				5,306			3,137
	Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year			93				303			496
1998 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Stock Option Activity	CTBI's stock option activity for the 1998 Plan for the years ended December 31, 2014, 2013, and 2012 is summarized as follows:
	31-Dec		2014							2013					2012
			Options				Weighted Average Exercise Price			Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
	Outstanding at beginning of year			78,066			$	28.91			195,279		$	28.08		353,694		$	24.41
	Granted			0				--			0			--		0			--
	Exercised			(34,106	)			28.25			(117,213	)		27.54		(158,305	)		19.85
	Forfeited/expired			0				--			0			--		(110	)		29.49
	Outstanding at end of year			43,960			$	29.43			78,066		$	28.91		195,279		$	28.08
	Exercisable at end of year			43,960			$	29.43			78,066		$	28.91		195,279		$	28.08
Schedule of Intrinsic Values of Options Exercised, Exercisable, and Outstanding	The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 1998 Plan for the years ended December 31, 2014, 2013, and 2012:
	(in thousands)		2014				2013			2012
	Options exercised		$	270			$	1,175		$	690
	Options exercisable			316				948			1,517
	Outstanding options			316				948			1,517
2006 Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Schedule of Stock Option Activity	CTBI's stock option activity for the 2006 Plan for the years ended December 31, 2014, 2013, and 2012 is summarized as follows:
	31-Dec		2014							2013					2012
			Options				Weighted Average Exercise Price			Options			Weighted Average Exercise Price		Options			Weighted Average Exercise Price
	Outstanding at beginning of year			97,047			$	32.29			163,524		$	31.56		167,828		$	31.43
	Granted			10,000				34.75			1,650			30.64		0			--
	Exercised			(5,757	)			34.62			(68,127	)		30.52		(3,507	)		25.92
	Forfeited/expired			(2,469	)			34.29			0			--		(797	)		--
	Outstanding at end of year			98,821			$	32.35			97,047		$	32.29		163,524		$	31.56
	Exercisable at end of year			86,264			$	32.25			92,997		$	32.56		112,555		$	34.26
Summary for Status of Nonvested Options	A summary of the status of CTBI's 2006 Plan for nonvested options as of December 31, 2014, and changes during the year ended December 31, 2014, is presented as follows:
	Nonvested Options		Options				Weighted Average Grant Date Fair Value
	Nonvested at January 1, 2014			4,051			$	6.87
	Granted			10,000				7.76
	Vested			(1,274	)			6.68
	Forfeited			(220	)			5.94
	Nonvested at December 31, 2014			12,557			$	7.61
Schedule of Intrinsic Values of Options Exercised, Exercisable, and Outstanding	The following table shows the intrinsic values of options exercised, exercisable, and outstanding for the 2006 Plan for the years ended December 31, 2014, 2013, and 2012:
	(in thousands)		2014				2013			2012
	Options exercised		$	11			$	477		$	22
	Options exercisable			376				790			88
	Outstanding options			421				849			388

Operating_Leases_Tables

Operating Leases (Tables)	12 Months Ended
	Dec. 31, 2014
Operating Leases [Abstract]
Schedule of Minimum Non-Cancellable Rental Payments and Rental Receipts	Minimum non-cancellable rental payments and rental receipts are as follows:
	(in thousands)	Payments		Receipts
	2015		1,970		577
	2016		1,411		339
	2017		1,270		210
	2018		862		78
	2019		356		4
	Thereafter		2,781		0
	Total	$	8,650	$	1,208

Fair_Market_Value_of_Financial1

Fair Market Value of Financial Assets and Liabilities (Tables)	12 Months Ended
	Dec. 31, 2014
Fair Market Value of Financial Assets and Liabilities [Abstract]
Fair Value Measurements of Assets Measured at Fair Value on Recurring Basis	The following tables present the fair value measurements of assets recognized in the accompanying balance sheets measured at fair value on a recurring basis as of December 31, 2014 and December 31, 2013 and indicate the level within the fair value hierarchy of the valuation techniques.
	(in thousands)					Fair Value Measurements at
						December 31, 2014 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – recurring basis
	Available-for-sale securities:
	U.S. Treasury and government agencies	$	188,932			$	0			$	188,932	$	0
	State and political subdivisions		137,458				0				137,458		0
	U.S. government sponsored agency mortgage-backed securities		288,907				0				288,907		0
	Marketable equity securities		24,889				24,889				0		0
	Mortgage servicing rights		2,968				0				0		2,968
	(in thousands)					Fair Value Measurements at
						December 31, 2013 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – recurring basis
	Available-for-sale securities:
	U.S. Treasury and government agencies	$	72,623			$	0			$	72,623	$	0
	State and political subdivisions		116,703				0				116,703		0
	U.S. government sponsored agency mortgage-backed securities		367,297				0				367,297		0
	Marketable equity securities		52,782				52,782				0		0
	Mortgage servicing rights		3,424				0				0		3,424
Reconciliation of Beginning and Ending Balances of Recurring Fair Value Measurements Using Significant Unobservable (Level 3) Inputs	Following is a reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying balance sheet using significant unobservable (Level 3) inputs:
	(in thousands)	2014				2013
		Mortgage Servicing Rights				Mortgage Servicing Rights
	Beginning balance	$	3,424			$	2,364
	Total recognized gains (losses)
	Included in net income		(467	)			788
	Issues		374				854
	Settlements		(363	)			(582	)
	Ending balance	$	2,968			$	3,424
	Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date	$	(467	)		$	788
Realized and Unrealized Gains and Losses Included in Net Income in Consolidated Statements of Income	Realized and unrealized gains and losses for items reflected in the table above are included in net income in the consolidated statements of income as follows:
	(in thousands)	2014								2013
		Noninterest Income				Noninterest Expense				Noninterest Income		Noninterest Expense
	Total gains (losses)	$	(830	)		$	0			$	206	$	0
Fair Value Measurements of Assets Measured at Fair Value on Nonrecurring Basis	The following tables present the fair value measurements of assets recognized in the accompanying balance sheets measured at fair value on a nonrecurring basis as of December 31, 2014 and December 31, 2013 and indicate the level within the fair value hierarchy of the valuation techniques.
	(in thousands)					Fair Value Measurements at
						December 31, 2014 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – nonrecurring basis
	Impaired loans (collateral dependent)	$	4,665			$	0			$	0	$	4,665
	Other real estate/assets owned		6,472				0				0		6,472
	(in thousands)					Fair Value Measurements at
						December 31, 2013 Using
		Fair Value				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs		Significant Unobservable Inputs
						(Level 1)				(Level 2)		(Level 3)
	Assets measured – nonrecurring basis
	Impaired loans (collateral dependent)	$	6,830			$	0			$	0	$	6,830
	Other real estate/assets owned		11,111				0				0		11,111
Quantitative Information about Unobservable Inputs Used in Recurring and Nonrecurring Level 3 Fair Value Measurements	The following tables present quantitative information about unobservable inputs used in recurring and nonrecurring Level 3 fair value measurements at December 31, 2014 and December 31, 2013.
	(in thousands)	Quantitative Information about Level 3 Fair Value Measurements
		Fair Value at December 31, 2014			Valuation Technique(s)	Unobservable Input		Range (Weighted Average)
	Mortgage servicing rights	$	2,968		Discount cash flows, computer pricing model	Constant prepayment rate			4.6% - 25.1%	%)
									(11.3
						Probability of default			0.00% - 100.0%	%)
									(3.61
						Discount rate			10.0% - 11.5%	%)
									(10.13
	Impaired loans (collateral-dependent)	$	4,665		Market comparable properties	Marketability discount			5.0% - 10.0%	%)
									(7.0
	Other real estate/assets owned	$	6,472		Market comparable properties	Comparability adjustments (%)			3.0% - 67.0%	%)
									(18.0
	(in thousands)	Quantitative Information about Level 3 Fair Value Measurements
		Fair Value at December 31, 2013			Valuation Technique(s)	Unobservable Input		Range (Weighted Average)
	Mortgage servicing rights	$	3,424		Discount cash flows, computer pricing model	Constant prepayment rate			4.3% - 23.6%	%)
									(9.7
						Probability of default			0.00% - 33.33%	%)
									(3.36
						Discount rate		Not applicable (10.0%)
	Impaired loans (collateral-dependent)	$	6,830		Market comparable properties	Marketability discount			5.0% - 10.0%	%)
									(7.0
	Other real estate/assets owned	$	11,111		Market comparable properties	Comparability adjustments (%)			5.0% - 38.0%	%)
									(9.0
Estimated Fair Value of Financial Instruments and Level Within Fair Value Hierarchy of Valuation Techniques	The following table presents estimated fair value of CTBI's financial instruments as of December 31, 2014 and indicates the level within the fair value hierarchy of the valuation techniques.
						Fair Value Measurements
	(in thousands)					at December 31, 2014 Using
		Carrying Amount				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs
						(Level 1)						(Level 3)
	Financial assets:
	Cash and cash equivalents	$	105,517			$	105,517			$	0	$	0
	Certificates of deposit in other banks		8,197				0				8,213		0
	Securities available-for-sale		640,186				24,889				615,297		0
	Securities held-to-maturity		1,662				0				1,644		0
	Loans held for sale		2,264				2,321				0		0
	Loans, net		2,699,377				0				0		2,691,906
	Federal Home Loan Bank stock		17,927				0				17,927		0
	Federal Reserve Bank stock		4,869				0				4,869		0
	Accrued interest receivable		13,548				0				13,548		0
	Mortgage servicing rights		2,968				0				0		2,968
	Financial liabilities:
	Deposits	$	2,874,257			$	677,626			$	2,192,848	$	0
	Repurchase agreements		235,186				0				0		235,193
	Federal funds purchased		11,041				0				11,041		0
	Advances from Federal Home Loan Bank		61,170				0				61,106		0
	Long-term debt		61,341				0				0		35,615
	Accrued interest payable		908				0				908		0
	Unrecognized financial instruments:
	Letters of credit	$	0			$	0			$	0	$	0
	Commitments to extend credit		0				0				0		0
	Forward sale commitments		0				0				0		0
	The following table presents estimated fair value of CTBI's financial instruments as of December 31, 2013 and indicates the level within the fair value hierarchy of the valuation techniques.
						Fair Value Measurements
	(in thousands)					at December 31, 2013 Using
		Carrying Amount				Quoted Prices in Active Markets for Identical Assets				Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs
						(Level 1)						(Level 3)
	Financial assets:
	Cash and cash equivalents	$	106,641			$	106,641			$	0	$	0
	Certificates of deposit in other banks		9,568				0				9,582		0
	Securities available-for-sale		609,405				52,782				556,623		0
	Securities held-to-maturity		1,662				0				1,601		0
	Loans held for sale		828				845				0		0
	Loans, net		2,581,346				0				0		2,589,811
	Federal Home Loan Bank stock		25,673				0				25,673		0
	Federal Reserve Bank stock		4,886				0				4,886		0
	Accrued interest receivable		12,886				0				12,886		0
	Mortgage servicing rights		3,424				0				0		3,424
	Financial liabilities:
	Deposits	$	2,855,074			$	621,321			$	2,230,608	$	0
	Repurchase agreements		208,067				0				0		207,992
	Federal funds purchased		12,465				0				12,465		0
	Advances from Federal Home Loan Bank		1,286				0				1,531		0
	Long-term debt		61,341				0				0		31,362
	Accrued interest payable		1,032				0				1,032		0
	Unrecognized financial instruments:
	Letters of credit	$	0			$	0			$	0	$	0
	Commitments to extend credit		0				0				0		0
	Forward sale commitments		0				0				0		0

OffBalance_Sheet_Transactions_1

Off-Balance Sheet Transactions and Guarantees (Tables)	12 Months Ended
	Dec. 31, 2014
Off-Balance Sheet Transactions and Guarantees [Abstract]
Off-Balance Sheet Financial Instruments	At December 31, CTBI had the following off-balance sheet financial instruments, whose approximate contract amounts represent additional credit risk to CTBI:
	(in thousands)	2014		2013
	Standby letters of credit	$	28,524	$	34,861
	Commitments to extend credit		459,380		410,803
	Total off-balance sheet financial instruments	$	487,904	$	445,664

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2014
Regulatory Matters [Abstract]
Capital Amounts and Ratios	Consolidated Capital Ratios
		Actual					For Capital Adequacy Purposes
	(in thousands)	Amount		Ratio			Amount		Ratio
	As of December 31, 2014:
	Tier 1 capital (to average assets)	$	439,877		12.04	%	$	146,139		4	%
	Tier 1 capital (to risk weighted assets)		439,877		16.51			106,572		4
	Total capital (to risk weighted assets)		473,097		17.76			213,107		8
	As of December 31, 2013:
	Tier 1 capital (to average assets)	$	412,053		11.51	%	$	143,198		4	%
	Tier 1 capital (to risk weighted assets)		412,053		16.15			102,056		4
	Total capital (to risk weighted assets)		443,875		17.4			204,080		8
	Community Trust Bank, Inc.'s Capital Ratios
		Actual					For Capital Adequacy Purposes					To Be Well-Capitalized Under Prompt Corrective Action Provision
	(in thousands)	Amount		Ratio			Amount		Ratio			Amount		Ratio
	As of December 31, 2014:
	Tier 1 capital (to average assets)	$	416,861		11.47	%	$	145,374		4	%	$	181,718		5	%
	Tier 1 capital (to risk weighted assets)		416,861		15.69			106,274		4			159,411		6
	Total capital (to risk weighted assets)		450,081		16.94			212,553		8			265,691		10
	As of December 31, 2013:
	Tier 1 capital (to average assets)	$	392,932		11.03	%	$	142,496		4	%	$	178,120		5	%
	Tier 1 capital (to risk weighted assets)		392,932		15.45			101,730		4			152,595		6
	Total capital (to risk weighted assets)		424,754		16.7			203,475		8			254,344		10

Parent_Company_Financial_State1

Parent Company Financial Statements (Tables)	12 Months Ended
	Dec. 31, 2014
Parent Company Financial Statements [Abstract]
Schedule of Parent Company Financial Statements	Condensed Balance Sheets
	(in thousands)	2014			2013
	31-Dec
	Assets:
	Cash on deposit	$	995		$	1,272
	Investment in and advances to subsidiaries		503,252			468,240
	Goodwill		4,973			4,973
	Premises and equipment, net		207			235
	Other assets		1,173			617
	Total assets	$	510,600		$	475,337
	Liabilities and shareholders' equity:
	Long-term debt	$	61,341		$	61,341
	Other liabilities		1,382			1,504
	Total liabilities		62,723			62,845
	Shareholders' equity		447,877			412,492
	Total liabilities and shareholders' equity	$	510,600		$	475,337
	Condensed Statements of Income and Comprehensive Income
	(in thousands)	2014			2013			2012
	Year Ended December 31
	Income:
	Dividends from subsidiary banks	$	19,534		$	13,035		$	16,572
	Other income		196			545			238
	Total income		19,730			13,580			16,810
	Expenses:
	Interest expense		1,131			1,161			2,403
	Depreciation expense		153			163			127
	Other expenses		2,550			2,442			1,990
	Total expenses		3,834			3,766			4,520
	Income before income taxes and equity in undistributed income of subsidiaries		15,896			9,814			12,290
	Income tax benefit		(1,548	)		(1,416	)		(1,750	)
	Income before equity in undistributed income of subsidiaries		17,444			11,230			14,040
	Equity in undistributed income of subsidiaries		25,807			33,942			30,822
	Net income	$	43,251		$	45,172		$	44,862
	Other comprehensive income:
	Unrealized holding gains (losses) on securities available-for-sale:
	Unrealized holding gains arising during the period		13,928			(31,878	)		4,973
	Less: Reclassification adjustments for realized gains included in net income		211			45			(1,155	)
	Tax expense (benefit)		4,949			(11,142	)		1,336
	Other comprehensive income (loss), net of tax		9,190			(20,691	)		2,482
	Comprehensive income	$	52,441		$	24,481		$	47,344
	Condensed Statements of Cash Flows
	(in thousands)	2014			2013			2012
	Year Ended December 31
	Cash flows from operating activities:
	Net income	$	43,251		$	45,172		$	44,862
	Adjustments to reconcile net income to net cash provided by operating activities:
	Depreciation		153			163			127
	Equity in undistributed earnings of subsidiaries		(25,807	)		(33,942	)		(30,822	)
	Stock-based compensation		838			658			512
	Excess tax benefit of stock-based compensation		760			572			496
	Changes in:
	Other assets		(558	)		660			(771	)
	Other liabilities		563			1,505			495
	Net cash provided by operating activities		19,200			14,788			14,899
	Cash flows from investing activities:
	Purchase of premises and equipment		(125	)		(148	)		(166	)
	Repayment of investments in and advances to subsidiaries		(14	)		(40	)		(80	)
	Net cash used in investing activities		(139	)		(188	)		(246	)
	Cash flows from financing activities:
	Issuance of common stock		1,992			6,348			4,395
	Excess tax benefit of stock-based compensation		(760	)		(572	)		(496	)
	Dividends paid		(20,570	)		(24,546	)		(19,215	)
	Net cash used in financing activities		(19,338	)		(18,770	)		(15,316	)
	Net decrease in cash and cash equivalents		(277	)		(4,170	)		(663	)
Cash and cash equivalents at beginning of year		1,272			5,442			6,105
Cash and cash equivalents at end of year	$	995		$	1,272		$	5,442

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings per Share	The following table sets forth the computation of basic and diluted earnings per share:
	Year Ended December 31	2014		2013		2012
	(in thousands except per share data)
	Numerator:
	Net income	$	43,251	$	45,172	$	44,862
	Denominator:
	Basic earnings per share:
	Weighted average shares		17,326		17,158		17,013
	Diluted earnings per share:
	Dilutive effect of equity grants		71		82		60
	Adjusted weighted average shares		17,397		17,240		17,073
	Earnings per share:
	Basic earnings per share	$	2.5	$	2.63	$	2.64
	Diluted earnings per share		2.49		2.62		2.63

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	12 Months Ended
	Dec. 31, 2014
Accumulated Other Comprehensive Income [Abstract]
Amounts Reclassified from Accumulated Other Comprehensive Income (AOCI)	Amounts reclassified from accumulated other comprehensive income (AOCI) and the affected line items in the statements of income during the years ended December 31, 2014, 2013, and 2012 were:
		Amounts Reclassified from AOCI
	Year Ended December 31	2014			2013			2012
	(in thousands)
	Affected line item in the statements of income
	Securities gains (losses)	$	(211	)	$	(45	)	$	1,155
	Tax (benefit) expense		(74	)		(15	)		405
	Total reclassifications out of AOCI	$	(137	)	$	(30	)	$	750

Accounting_Policies_Details

Accounting Policies (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Maturity period of certificates of deposit in other banks	18 months
Threshold past due period after which loan must be well secured and in the process of collection to continue accruing interest	90 days
Minimum threshold period for not reclassifying loans as accruing loans	6 months
Charge off threshold for unsecured commercial loans considered uncollectible	90 days
Charge off threshold for closed-end consumer loans and uncollectible loans	120 days
Number of monthly payments before loan charge off	5
Current value assessment period for past due loans secured against real estate	90 days
Foreclosure proceedings initiated	120 days
Other Real Estate Owned [Abstract]
Typical frequency of periodic reviews, minimum	12 months
Typical frequency of periodic reviews, maximum	18 months
Maximum frequency of periodic reviews	24 months
Goodwill and Core Deposit Intangible [Abstract]
Goodwill	$65,490,000	$65,490,000
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, January 1	690,000
Ending balance, December 31	477,000
Segment Reporting [Abstract]
Number of operating segments	1
Reclassifications [Abstract]
Stock dividend rate (in hundredths)	10.00%
Dividend record date	15-May-14
New shares issued in stock dividend (in shares)	1,582,137
Fair value of additional shares issued	0
Retained Earnings [Member]
Reclassifications [Abstract]
Fair value of additional shares issued	-52,304,000
Common Stock [Member]
Reclassifications [Abstract]
Fair value of additional shares issued	7,910,000
Additional Paid-in Capital [Member]
Reclassifications [Abstract]
Fair value of additional shares issued	44,394,000
Core Deposit Intangible [Member]
Finite-lived Intangible Assets [Roll Forward]
Beginning balance, January 1	690,000	904,000	1,117,000
Amortization	-213,000	-214,000	-213,000
Ending balance, December 31	477,000	690,000	904,000
Amortization of intangible assets for year one	200,000
Amortization of intangible assets for year two	200,000
Amortization of intangible assets for year three	$100,000
Buildings [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	40 years
Minimum [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Historical loan loss review period (in quarters)	12
Minimum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	2 years
Maximum [Member] | Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment [Line Items]
Estimated useful life	10 years

Cash_and_Due_from_Banks_and_In1

Cash and Due from Banks and Interest Bearing Deposits (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Cash and Cash Equivalents [Line Items]
Balance requirements	$64.50	$60
Federal Reserve [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	40.9
Fifth Third Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	22.1
Federal Home Loan Bank [Member]
Cash and Cash Equivalents [Line Items]
Cash accounts which exceeded federally insured limits	$3.40

Securities_Details

Securities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Available-for-sale Debt Securities [Abstract]
Amortized cost	$613,395,000	$566,753,000
Gross unrealized gains	7,358,000	6,457,000
Gross unrealized losses	-5,456,000	-16,587,000
Fair value	615,297,000	556,623,000
Available-for-sale Equity Securities [Abstract]
Amortized cost	25,000,000
Securities Available-for-Sale [Abstract]
Amortized cost	638,395,000	621,753,000
Gross unrealized gains	7,358,000	6,457,000
Gross unrealized losses	-5,567,000	-18,805,000
Fair value	640,186,000	609,405,000
Available-for-Sale, Amortized Cost [Abstract]
Due in one year or less	9,153,000
Due after one through five years	124,725,000
Due after five through ten years	141,407,000
Due after ten years	49,229,000
U.S. government sponsored agency mortgage-backed securities	288,881,000
Amortized cost	613,395,000	566,753,000
Marketable equity securities	25,000,000
Amortized cost	638,395,000	621,753,000
Available-for-Sale, Fair Value [Abstract]
Due in one year or less	9,193,000
Due after one through five years	125,444,000
Due after five through ten years	141,625,000
Due after ten years	50,128,000
U.S. government sponsored agency mortgage-backed securities	288,907,000
Total debt securities	615,297,000	556,623,000
Marketable equity securities	24,889,000
Total securities	640,186,000
Securities gains (loss), net	-211,000	-45,000	1,155,000
Realized pre-tax gain on sale of securities	2,100,000
Realized pre-tax loss on sale of securities	2,400,000
Securities pledged as collateral to secure public deposit and for other purposes	267,100,000	257,500,000
Amortized cost of securities sold under agreements to repurchase	280,900,000	255,400,000
Percentage of total investment with unrealized losses (in hundredths)	44.10%	67.80%
Severity of impairment in percentage of fair value less than cost (in hundredths)	0.40%
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	115,100,000	382,620,000
12 Months or More	172,906,000	49,968,000
Total	288,006,000	432,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months	-663,000	-14,806,000
12 Months or More	-4,904,000	-3,999,000
Total	-5,567,000	-18,805,000
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	114,437,000	367,814,000
12 Months or More	168,002,000	45,969,000
Total	282,439,000	413,783,000
Securities Held-to-Maturity [Abstract]
Amortized Cost	1,662,000	1,662,000
Gross Unrealized Gains	1,000	1,000
Gross Unrealized Losses	-19,000	-62,000
Fair Value	1,644,000	1,601,000
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	1,662,000
Due after ten years	0
U.S. government sponsored agency mortgage-backed securities	0
Amortized Cost	1,662,000	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	1,644,000
Due after ten years	0
U.S. government sponsored agency mortgage-backed securities	0
Total debt securities	1,644,000	1,601,000
Marketable equity securities	0
Total securities	1,644,000
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	-19,000	-62,000
Held-to-Maturity, Fair Value [Abstract]
12 Months or More	461,000	418,000
U.S. Treasury and Government Agencies [Member]
Securities Held-to-Maturity [Abstract]
Amortized Cost	480,000	480,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	-19,000	-62,000
Fair Value	461,000	418,000
Held-to-Maturity, Amortized Cost [Abstract]
Amortized Cost	480,000	480,000
Held-to-Maturity, Fair Value [Abstract]
Total debt securities	461,000	418,000
State and Political Subdivisions [Member]
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
Held-to-Maturity, Amortized Cost [Abstract]
Amortized Cost	1,182,000	1,182,000
Held-to-Maturity, Fair Value [Abstract]
Total debt securities	1,183,000	1,183,000
U.S. Treasury and Government Agencies [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	190,563,000	77,838,000
Gross unrealized gains	509,000	277,000
Gross unrealized losses	-2,140,000	-5,492,000
Fair value	188,932,000	72,623,000
Available-for-Sale, Amortized Cost [Abstract]
Amortized cost	190,563,000	77,838,000
Available-for-Sale, Fair Value [Abstract]
Total debt securities	188,932,000	72,623,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	31,185,000	31,631,000
12 Months or More	65,209,000	35,750,000
Total	96,394,000	67,381,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months	-87,000	-1,970,000
12 Months or More	-2,053,000	-3,522,000
Total	-2,140,000	-5,492,000
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	31,098,000	29,661,000
12 Months or More	63,156,000	32,228,000
Total	94,254,000	61,889,000
State and Political Subdivisions [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	133,951,000	118,055,000
Gross unrealized gains	3,973,000	1,907,000
Gross unrealized losses	-466,000	-3,259,000
Fair value	137,458,000	116,703,000
Available-for-Sale, Amortized Cost [Abstract]
Amortized cost	133,951,000	118,055,000
Available-for-Sale, Fair Value [Abstract]
Total debt securities	137,458,000	116,703,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	8,800,000	57,165,000
12 Months or More	21,308,000	7,639,000
Total	30,108,000	64,804,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months	-23,000	-2,789,000
12 Months or More	-443,000	-470,000
Total	-466,000	-3,259,000
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	8,777,000	54,376,000
12 Months or More	20,865,000	7,169,000
Total	29,642,000	61,545,000
U.S. Government Sponsored Agency Mortgage-backed Securities [Member]
Available-for-sale Debt Securities [Abstract]
Amortized cost	288,881,000	370,860,000
Gross unrealized gains	2,876,000	4,273,000
Gross unrealized losses	-2,850,000	-7,836,000
Fair value	288,907,000	367,297,000
Available-for-Sale, Amortized Cost [Abstract]
Amortized cost	288,881,000	370,860,000
Available-for-Sale, Fair Value [Abstract]
Total debt securities	288,907,000	367,297,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	50,115,000	238,824,000
12 Months or More	86,389,000	6,579,000
Total	136,504,000	245,403,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months	-442,000	-7,829,000
12 Months or More	-2,408,000	-7,000
Total	-2,850,000	-7,836,000
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	49,673,000	230,995,000
12 Months or More	83,981,000	6,572,000
Total	133,654,000	237,567,000
Debt Securities [Member]
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	90,100,000	327,620,000
12 Months or More	172,906,000	49,968,000
Total	263,006,000	377,588,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months	-552,000	-12,588,000
12 Months or More	-4,904,000	-3,999,000
Total	-5,456,000	-16,587,000
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	89,548,000	315,032,000
12 Months or More	168,002,000	45,969,000
Total	257,550,000	361,001,000
Marketable Equity Securities [Member]
Available-for-sale Equity Securities [Abstract]
Amortized cost	25,000,000	55,000,000
Gross unrealized gains	0	0
Gross unrealized losses	-111,000	-2,218,000
Fair value	24,889,000	52,782,000
Available-for-Sale, Amortized Cost [Abstract]
Marketable equity securities	25,000,000	55,000,000
Available-for-Sale, Amortized Cost [Abstract]
Less Than 12 Months	25,000,000	55,000,000
12 Months or More	0	0
Total	25,000,000	55,000,000
Available-for-Sale, Gross Unrealized Losses [Abstract]
Less Than 12 Months	-111,000	-2,218,000
12 Months or More	0	0
Total	-111,000	-2,218,000
Available-for-Sale, Fair Value [Abstract]
Less Than 12 Months	24,889,000	52,782,000
12 Months or More	0	0
Total	24,889,000	52,782,000
Fixed Income Mutual Funds [Member]
Available-for-Sale, Fair Value [Abstract]
Marketable equity securities, fair value	24,900,000
Marketable equity securities, total unrealized losses	$111,000

Loans_Major_Classifications_of

Loans, Major Classifications of Loans, Net of Income and Deferred Loan Origination Cost (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	$2,733,824,000	$2,615,354,000
Loans held for sale [Abstract]
Loans held for sale	2,264,000	828,000
Loan threshold amount	500,000
Secured commercial loan requesting financing (in hundredths)	100.00%
Commercial Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	121,942,000	110,779,000
Commercial Secured by Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	948,626,000	872,542,000
Equipment Lease Financing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	10,344,000	8,840,000
Commercial Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	352,048,000	374,881,000
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	62,412,000	56,075,000
Real Estate Mortgage [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	712,465,000	697,601,000
Home Equity [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	88,335,000	84,880,000
Consumer Direct [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	122,136,000	122,215,000
Consumer Indirect [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans, net of unearned income and deferred origination costs	$315,516,000	$287,541,000

Loans_Nonaccrual_Loans_Segrega

Loans, Nonaccrual Loans Segregated by Class of Loans and Loan Portfolio Aging Analysis, Segregated by Class (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	$20,971		$19,958
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	8,824		10,251
60-89 Days Past Due	8,074		8,661
90+ Days Past Due	36,402		40,021
Total Past Due	53,300		58,933
Current	2,680,524		2,556,421
Total Loans	2,733,824		2,615,354
90+ and Accruing	17,985	[1]	23,599	[1]
Commercial [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
Total Loans	1,432,960		1,367,042
Commercial Construction [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	4,339		4,519
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	40		250
60-89 Days Past Due	31		166
90+ Days Past Due	6,171		6,012
Total Past Due	6,242		6,428
Current	115,700		104,351
Total Loans	121,942		110,779
90+ and Accruing	1,863	[1]	1,673	[1]
Commercial Secured by Real Estate [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	6,725		6,576
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	2,471		3,703
60-89 Days Past Due	1,595		1,982
90+ Days Past Due	10,763		16,660
Total Past Due	14,829		22,345
Current	933,797		850,197
Total Loans	948,626		872,542
90+ and Accruing	4,682	[1]	12,403	[1]
Commercial Other [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	2,423		2,801
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	826		344
60-89 Days Past Due	55		422
90+ Days Past Due	4,205		6,156
Total Past Due	5,086		6,922
Current	346,962		367,959
Total Loans	352,048		374,881
90+ and Accruing	2,367	[1]	3,723	[1]
Equipment Lease Financing [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	0		0
60-89 Days Past Due	0		0
90+ Days Past Due	0		0
Total Past Due	0		0
Current	10,344		8,840
Total Loans	10,344		8,840
90+ and Accruing	0	[1]	0	[1]
Real Estate Construction [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	602		481
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	92		81
60-89 Days Past Due	144		383
90+ Days Past Due	985		694
Total Past Due	1,221		1,158
Current	61,191		54,917
Total Loans	62,412		56,075
90+ and Accruing	383	[1]	213	[1]
Real Estate Mortgage [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	6,513		5,152
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	1,005		1,274
60-89 Days Past Due	5,171		4,419
90+ Days Past Due	13,049		9,346
Total Past Due	19,225		15,039
Current	693,240		682,562
Total Loans	712,465		697,601
90+ and Accruing	7,742	[1]	4,847	[1]
Home Equity [Member]
Nonaccrual loans and loan portfolio aging analysis, segregated by class [Line Items]
Nonaccrual loans segregated by class of loans	369		429
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	779		786
60-89 Days Past Due	197		330
90+ Days Past Due	703		737
Total Past Due	1,679		1,853
Current	86,656		83,027
Total Loans	88,335		84,880
90+ and Accruing	422	[1]	324	[1]
Consumer Direct [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	1,307		1,063
60-89 Days Past Due	295		291
90+ Days Past Due	141		119
Total Past Due	1,743		1,473
Current	120,393		120,742
Total Loans	122,136		122,215
90+ and Accruing	141	[1]	119	[1]
Consumer Indirect [Member]
Bank's Loan portfolio aging analysis, segregated by class [Abstract]
30-59 Days Past Due	2,304		2,750
60-89 Days Past Due	586		668
90+ Days Past Due	385		297
Total Past Due	3,275		3,715
Current	312,241		283,826
Total Loans	315,516		287,541
90+ and Accruing	$385	[1]	$297	[1]
[1]	90+ and Accruing are also included in 90+ Days Past Due column.

Loans_Credit_Risk_Profile_Base

Loans, Credit Risk Profile Based on Rating Category and Payment Activity and on Performing and Nonperforming Status, Segregated by Class (Details) (USD $)	Dec. 31, 2014		Dec. 31, 2013
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	$2,733,824		$2,615,354
Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	1,432,960		1,367,042
Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	121,942		110,779
Commercial Secured by Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	948,626		872,542
Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	352,048		374,881
Equipment Lease [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	10,344		8,840
Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	62,412		56,075
Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	712,465		697,601
Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	88,335		84,880
Consumer Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	122,136		122,215
Consumer Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	315,516		287,541
Residential and Consumer Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	1,300,864		1,248,312
Pass [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	1,253,679		1,162,559
Pass [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	101,314		85,699
Pass [Member] | Commercial Secured by Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	834,751		746,202
Pass [Member] | Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	307,270		321,818
Pass [Member] | Equipment Lease [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	10,344		8,840
Watch [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	115,094		123,880
Watch [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	9,857		13,519
Watch [Member] | Commercial Secured by Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	69,123		77,561
Watch [Member] | Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	36,114		32,800
Watch [Member] | Equipment Lease [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	0		0
OAEM [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	12,788		12,839
OAEM [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	934		0
OAEM [Member] | Commercial Secured by Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	10,973		6,639
OAEM [Member] | Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	881		6,200
OAEM [Member] | Equipment Lease [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	0		0
Substandard [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	39,320		56,314
Substandard [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	5,647		7,208
Substandard [Member] | Commercial Secured by Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	27,901		37,334
Substandard [Member] | Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	5,772		11,772
Substandard [Member] | Equipment Lease [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	0		0
Doubtful [Member] | Commercial [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	12,079		11,450
Doubtful [Member] | Commercial Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	4,190		4,353
Doubtful [Member] | Commercial Secured by Real Estate [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	5,878		4,806
Doubtful [Member] | Commercial Other [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	2,011		2,291
Doubtful [Member] | Equipment Lease [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	0		0
Performing [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	61,427		55,381
Performing [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	698,210		687,602
Performing [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	87,544		84,127
Performing [Member] | Consumer Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	121,995		122,096
Performing [Member] | Consumer Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	315,131		287,244
Performing [Member] | Residential and Consumer Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	1,284,307		1,236,450
Nonperforming [Member] | Real Estate Construction [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	985	[1]	694	[1]
Nonperforming [Member] | Real Estate Mortgage [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	14,255	[1]	9,999	[1]
Nonperforming [Member] | Home Equity [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	791	[1]	753	[1]
Nonperforming [Member] | Consumer Direct [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	141	[1]	119	[1]
Nonperforming [Member] | Consumer Indirect [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	385	[1]	297	[1]
Nonperforming [Member] | Residential and Consumer Portfolio Segments [Member]
Financing Receivable, Recorded Investment [Line Items]
Loan portfolio based on credit risk profile	$16,557	[1]	$11,862	[1]
[1]	A loan is considered nonperforming if it is 90 days or more past due or on nonaccrual.

Loans_Impaired_Loans_Average_I

Loans, Impaired Loans, Average Investments in Impaired Loans, and Interest Income Recognized on Impaired Loans (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Loans with a specific valuation allowance [Abstract]
Specific Allowance	$1,742		$2,296		$3,248
Total impaired loans [Abstract]
Recorded Balance	59,068		65,300		62,498
Unpaid Contractual Principal Balance	62,508		68,228		68,596
Specific Allowance	1,742		2,296		3,248
Average Investment in Impaired Loans	66,358		64,890		62,624
Interest Income Recognized	2,233	[1]	2,083	[1]	1,880	[1]
Commercial Construction [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance	5,653		5,457		3,692
Unpaid Contractual Principal Balance	5,654		5,458		4,146
Average Investment in Impaired Loans	5,415		5,595		4,249
Interest Income Recognized	205	[1]	240	[1]	97	[1]
Loans with a specific valuation allowance [Abstract]
Recorded Balance	3,974		4,353		5,703
Unpaid Contractual Principal Balance	3,974		4,359		6,933
Specific Allowance	734		1,189		1,820
Average Investment in Impaired Loans	4,216		4,935		6,585
Interest Income Recognized	0	[1]	0	[1]	0	[1]
Total impaired loans [Abstract]
Recorded Balance	9,627		9,810		9,395
Unpaid Contractual Principal Balance	9,628		9,817		11,079
Specific Allowance	734		1,189		1,820
Average Investment in Impaired Loans	9,631		10,530		10,834
Interest Income Recognized	205	[1]	240	[1]	97	[1]
Commercial Secured by Real Estate [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance	31,639		35,258		35,046
Unpaid Contractual Principal Balance	33,268		36,173		35,818
Average Investment in Impaired Loans	34,650		32,472		35,542
Interest Income Recognized	1,180	[1]	1,231	[1]	1,337	[1]
Loans with a specific valuation allowance [Abstract]
Recorded Balance	2,718		4,039		3,067
Unpaid Contractual Principal Balance	2,876		4,326		3,189
Specific Allowance	827		1,005		1,090
Average Investment in Impaired Loans	4,376		5,033		3,243
Interest Income Recognized	11	[1]	1	[1]	0	[1]
Total impaired loans [Abstract]
Recorded Balance	34,357		39,297		38,113
Unpaid Contractual Principal Balance	36,144		40,499		39,007
Specific Allowance	827		1,005		1,090
Average Investment in Impaired Loans	39,026		37,505		38,785
Interest Income Recognized	1,191	[1]	1,232	[1]	1,337	[1]
Commercial Other [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance	13,069		14,839		13,285
Unpaid Contractual Principal Balance	14,597		16,435		15,484
Average Investment in Impaired Loans	15,663		15,396		11,083
Interest Income Recognized	783	[1]	568	[1]	416	[1]
Loans with a specific valuation allowance [Abstract]
Recorded Balance	738		330		1,010
Unpaid Contractual Principal Balance	862		453		2,331
Specific Allowance	181		102		338
Average Investment in Impaired Loans	531		525		1,441
Interest Income Recognized	1	[1]	0	[1]	0	[1]
Total impaired loans [Abstract]
Recorded Balance	13,807		15,169		14,295
Unpaid Contractual Principal Balance	15,459		16,888		17,815
Specific Allowance	181		102		338
Average Investment in Impaired Loans	16,194		15,921		12,524
Interest Income Recognized	784	[1]	568	[1]	416	[1]
Real Estate Mortgage [Member]
Loans without a specific valuation allowance [Abstract]
Recorded Balance	1,277		1,024		695
Unpaid Contractual Principal Balance	1,277		1,024		695
Average Investment in Impaired Loans	1,507		934		481
Interest Income Recognized	53	[1]	43	[1]	30	[1]
Loans with a specific valuation allowance [Abstract]
Specific Allowance	0		0		0
Total impaired loans [Abstract]
Recorded Balance	1,277		1,024		695
Unpaid Contractual Principal Balance	1,277		1,024		695
Specific Allowance	0		0		0
Average Investment in Impaired Loans	1,507		934		481
Interest Income Recognized	$53	[1]	$43	[1]	$30	[1]
[1]	Cash basis interest is substantially the same as interest income recognized.

Loans_Troubled_Debt_Restructur

Loans, Troubled Debt Restructurings Segregated by Class (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Loan	Loan
Financing Receivable, Modifications [Line Items]
Number of Loans	22	64
Post-Modification Outstanding Balance	$7,898,000	$15,087,000
Commitment to extend additional credit on loans modified	100,000
Past due period for loan to be considered in default, minimum	90 days
Defaulted Restructured Loans, Number of Loans	2	9
Defaulted Restructured Loans, Recorded Balance	669,000	1,058,000
Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	6,982,000	12,015,000
Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0
Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	916,000	3,072,000
Commercial Construction [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	1	6
Post-Modification Outstanding Balance	7,000	2,603,000
Commercial Construction [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	7,000	2,603,000
Commercial Construction [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0
Commercial Construction [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0
Commercial Secured by Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	11	27
Post-Modification Outstanding Balance	5,775,000	5,488,000
Defaulted Restructured Loans, Number of Loans		2
Defaulted Restructured Loans, Recorded Balance		89,000
Commercial Secured by Real Estate [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	5,707,000	2,568,000
Commercial Secured by Real Estate [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0
Commercial Secured by Real Estate [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	68,000	2,920,000
Commercial Other [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	8	30
Post-Modification Outstanding Balance	1,268,000	6,623,000
Defaulted Restructured Loans, Number of Loans	1	6
Defaulted Restructured Loans, Recorded Balance	88,000	596,000
Commercial Other [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	1,268,000	6,471,000
Commercial Other [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0
Commercial Other [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	152,000
Real Estate Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Number of Loans	2	1
Post-Modification Outstanding Balance	848,000	373,000
Defaulted Restructured Loans, Number of Loans	1	1
Defaulted Restructured Loans, Recorded Balance	581,000	373,000
Real Estate Mortgage [Member] | Term Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	373,000
Real Estate Mortgage [Member] | Rate Modification [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	0	0
Real Estate Mortgage [Member] | Combination [Member]
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Balance	$848,000	$0

Mortgage_Banking_and_Servicing2

Mortgage Banking and Servicing Rights (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Mortgage Banking and Servicing Rights [Abstract]
Net gain on sale of loans held for sale	$1,468		$3,098		$2,562
Net loan servicing income (expense)
Servicing fees	1,129		1,121		1,083
Late fees	112		98		83
Ancillary fees	149		368		382
Fair value adjustments	-830		206		-559
Net loan servicing income	560		1,793		989
Mortgage banking income	2,028		4,891		3,551
Loan service for benefit of others	441		456		419
Custodial escrow balance	888		855		673
Servicing Asset at Fair Value, Amount [Roll Forward]
Fair value of MSRs, beginning of period	3,424		2,364		2,282
New servicing assets created	374		854		641
Change in fair value during the period due to [Abstract]
Time decay	-162	[1]	-159	[1]	-116	[1]
Payoffs	-202	[2]	-423	[2]	-478	[2]
Changes in valuation inputs or assumptions	-466	[3]	788	[3]	35	[3]
Fair value of MSRs, end of period	$2,968		$3,424		$2,364
Discount rate of servicing assets and servicing liabilities (in hundredths)	10.10%		10.00%		10.50%
Weighted average default rates (in hundredths)	3.61%		3.36%		2.65%
Prepayment using andrew davidson model (in hundredths)	11.30%		9.70%		16.30%
[1]	Represents decrease in value due to regularly scheduled loan principal payments and partial loan paydowns.
[2]	Represents decrease in value due to loans that paid off during the period.
[3]	Represents change in value resulting from market-driven changes in interest rates.

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Loans and Leases Receivable, Related Parties [Roll Forward]
Related party extensions of credit, beginning of period	$33,103,000	$33,038,000
New loans and advances on lines of credit	5,500,000	8,305,000
Repayments	-1,281,000	-8,237,000
Increase/(decrease) due to changes in related parties	151,000	-3,000
Related party extensions of credit, end of period	37,473,000	33,103,000	33,038,000
Related Party Transaction [Line Items]
Related party deposit	12,400,000	13,300,000
Legal fees	2,444,000	2,392,000	2,154,000
Director [Member]
Related Party Transaction [Line Items]
Legal fees	1,000,000	1,100,000	1,300,000
Expenses paid to law firm	100,000	200,000	200,000
Payment for legal services	$1,100,000	$1,300,000	$1,500,000

Allowance_for_Loan_and_Lease_L2

Allowance for Loan and Lease Losses (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	$34,008	$33,245	$33,171
Provision charged to expense	8,755	8,568	9,450
Losses charged off	11,436	11,049	12,590
Recoveries	3,120	3,244	3,214
ALLL balance, end of year	34,447	34,008	33,245
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	1,742	2,296	3,248
Collectively evaluated for impairment	32,705	31,712	29,997
Loans Ending balance: [Abstract]
Individually evaluated for impairment	59,068	65,300	62,498
Collectively evaluated for impairment	2,674,756	2,550,054	2,488,075
Commercial Construction [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	3,396	4,033	4,023
Provision charged to expense	-513	189	1,009
Losses charged off	15	1,135	1,034
Recoveries	28	309	35
ALLL balance, end of year	2,896	3,396	4,033
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	734	1,189	1,820
Collectively evaluated for impairment	2,162	2,207	2,213
Loans Ending balance: [Abstract]
Individually evaluated for impairment	9,627	9,810	9,395
Collectively evaluated for impairment	112,315	100,969	110,052
Commercial Secured by Real Estate [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	14,535	13,541	11,753
Provision charged to expense	941	2,438	3,520
Losses charged off	2,163	1,607	2,035
Recoveries	305	163	303
ALLL balance, end of year	13,618	14,535	13,541
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	827	1,005	1,090
Collectively evaluated for impairment	12,791	13,530	12,451
Loans Ending balance: [Abstract]
Individually evaluated for impairment	34,357	39,297	38,113
Collectively evaluated for impairment	914,269	833,245	769,100
Equipment Lease Financing [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	121	126	112
Provision charged to expense	-2	-5	14
Losses charged off	0	0	0
Recoveries	0	0	0
ALLL balance, end of year	119	121	126
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	119	121	126
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	10,344	8,840	9,246
Commercial Other [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	5,238	5,469	5,608
Provision charged to expense	1,545	1,477	2,330
Losses charged off	3,141	2,265	3,233
Recoveries	621	557	764
ALLL balance, end of year	4,263	5,238	5,469
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	181	102	338
Collectively evaluated for impairment	4,082	5,136	5,131
Loans Ending balance: [Abstract]
Individually evaluated for impairment	13,807	15,169	14,295
Collectively evaluated for impairment	338,241	359,712	362,053
Real Estate Construction [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	397	376	354
Provision charged to expense	258	106	183
Losses charged off	123	89	189
Recoveries	2	4	28
ALLL balance, end of year	534	397	376
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	534	397	376
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	62,412	56,075	55,041
Real Estate Mortgage [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	4,939	4,767	4,302
Provision charged to expense	2,173	860	1,437
Losses charged off	1,058	744	1,123
Recoveries	40	56	151
ALLL balance, end of year	6,094	4,939	4,767
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	6,094	4,939	4,767
Loans Ending balance: [Abstract]
Individually evaluated for impairment	1,277	1,024	695
Collectively evaluated for impairment	711,188	696,577	696,233
Home Equity [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	601	563	562
Provision charged to expense	265	268	238
Losses charged off	115	241	248
Recoveries	5	11	11
ALLL balance, end of year	756	601	563
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	756	601	563
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	88,335	84,880	82,292
Consumer Direct [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	1,127	1,102	917
Provision charged to expense	1,207	696	892
Losses charged off	1,326	1,166	1,245
Recoveries	566	495	538
ALLL balance, end of year	1,574	1,127	1,102
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	1,574	1,127	1,102
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	122,136	122,215	122,581
Consumer Indirect [Member]
Allowance for loan and lease losses [Roll Forward]
ALLL balance, beginning of year	3,654	3,268	5,540
Provision charged to expense	2,881	2,539	-173
Losses charged off	3,495	3,802	3,483
Recoveries	1,553	1,649	1,384
ALLL balance, end of year	4,593	3,654	3,268
Allowance for Loan Losses Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	4,593	3,654	3,268
Loans Ending balance: [Abstract]
Individually evaluated for impairment	0	0	0
Collectively evaluated for impairment	$315,516	$287,541	$281,477

Premises_and_Equipment_Details

Premises and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	$116,016,000	$114,299,000
Less accumulated depreciation and amortization	-66,036,000	-62,299,000
Premises and equipment, net	49,980,000	52,000,000
Depreciation and amortization of premises and equipment	4,100,000	4,300,000	4,100,000
Land and Buildings [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	76,795,000	76,313,000
Leasehold Improvements [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	4,760,000	4,778,000
Furniture, Fixtures, and Equipment [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	34,234,000	32,237,000
Construction in Progress [Member]
Property, Plant and Equipment, Net, by Type [Abstract]
Premises and equipment, gross	$227,000	$971,000

Other_Real_Estate_Owned_Detail

Other Real Estate Owned (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Activity for other real estate owned [Roll Forward]
Beginning balance of other real estate owned	$39,188,000	$47,537,000
New assets acquired	12,199,000	7,429,000
Capitalized costs	0	6,000
Fair value adjustments	-1,730,000	-2,480,000	-2,704,000
Sale of assets	-12,881,000	-13,304,000
Ending balance of other real estate owned	36,776,000	39,188,000	47,537,000
Carrying cost and fair value adjustments for foreclosed properties	$3,900,000	$5,200,000	$5,300,000

Deposits_Details

Deposits (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Deposits [Abstract]
Noninterest bearing deposits	$677,626	$621,321
NOW accounts	31,998	31,017
Money market deposits	577,677	554,072
Savings	348,038	320,835
Certificates of deposit and other time deposits of $100,000 or more	619,887	660,016
Certificates of deposit and other time deposits less than $100,000	619,031	667,813
Total deposits	2,874,257	2,855,074
Interest Expense Deposit [Abstract]
Savings, NOW, and money market accounts	2,141	2,281	2,894
Certificates of deposit and other time deposits of $100,000 or more	4,265	4,863	7,378
Certificates of deposit and other time deposits less than $100,000	3,392	4,169	7,639
Total interest expense on deposits	9,798	11,313	17,911
Maturities of Time Deposits [Abstract]
Within 1 Year	1,054,119
2 Years	89,058
3 Years	42,499
4 Years	26,964
5 Years	25,834
After 5 Years	444
Total	1,238,918
Certificates of Deposit and Other Time Deposits of $100,000 or More [Member]
Maturities of Time Deposits [Abstract]
Within 1 Year	518,045
2 Years	48,833
3 Years	24,280
4 Years	14,070
5 Years	14,559
After 5 Years	100
Total	619,887
Certificates of Deposit and Other Time Deposits Less Than $100,000 [Member]
Maturities of Time Deposits [Abstract]
Within 1 Year	536,074
2 Years	40,225
3 Years	18,219
4 Years	12,894
5 Years	11,275
After 5 Years	344
Total	$619,031

Advances_from_Federal_Home_Loa2

Advances from Federal Home Loan Bank (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Advances from Federal Home Loan Bank [Abstract]
Monthly amortizing	$1,170,000	$1,286,000
Term	60,000,000	0
Total FHLB advances	61,170,000	1,286,000
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Total	1,170,000	1,286,000
Within 1 Year	123,000
2 Years	111,000
3 Years	98,000
4 Years	404,000
5 Years	20,000
After 5 Years	414,000
Federal home loan bank collateralized	17,900,000
FHLB maximum borrowing capacity	483,000,000
Federal home loan bank advances	61,200,000
Federal home loan bank letters of credit used for public fund pledging	109,500,000
Federal home loan bank advances available	312,300,000
Federal home loan bank, advances interest rate, range from (in hundredths)	0.00%
Federal home loan bank, advances interest rate, range to (in hundredths)	6.42%
Weighted average interest rate (in hundredths)	0.20%	1.84%
Term advances maturity [Abstract]
Total term advances	60,000,000	0
Advance #275, 0.17%, due 1/05/15 [Member]
Advances from Federal Home Loan Bank [Abstract]
Term	60,000,000	0
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Weighted average interest rate (in hundredths)	0.17%
Term advances maturity [Abstract]
Total term advances	60,000,000	0
Advance #279 and #280 , 0.17%, Maturing 02/03/15 [Member]
Advances from Federal Home Loan Bank [Abstract]
Term	80,000,000
Federal Home Loan Bank, Advances, Fiscal Year Maturity [Abstract]
Weighted average interest rate (in hundredths)	0.17%
Term advances maturity [Abstract]
Total term advances	$80,000,000

Borrowings_Details

Borrowings (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2007	Dec. 31, 2013
Short-term Debt [Line Items]
Repurchase agreements	$235,186,000		$208,067,000
Federal funds purchased	11,041,000		12,465,000
Total short-term debt	246,227,000		220,532,000
Maximum balance for repurchase agreements at any month-end	252,300,000
Long-term debt [Abstract]
Junior subordinated debentures, 1.83%, due 6/1/37	61,341,000		61,341,000
Interest rate on junior subordinated debentures (in hundredths)		6.52%
Maturity date of junior subordinated debentures	1-Jun-37
Issuance of capital securities in a private placement		59,500,000
Maturity period of debentures		30 years
Period after which debentures are redeemable		5 years
Description of variable rate basis	three-month LIBOR	three-month LIBOR
Basis spread on variable rate (in hundredths)	1.59%	1.59%
Subordinated Debentures 9.0% [Member]
Long-term debt [Abstract]
Interest rate on junior subordinated debentures (in hundredths)	9.00%
Subordinated Debentures 8.25% [Member]
Long-term debt [Abstract]
Interest rate on junior subordinated debentures (in hundredths)	8.25%
Junior Subordinated Debentures [Member]
Long-term debt [Abstract]
Junior subordinated debentures, 1.83%, due 6/1/37	61,341,000		61,341,000
Interest rate on junior subordinated debentures (in hundredths)	1.83%
Repurchase Agreements [Member]
Short-term Debt [Line Items]
Average interest rate (in hundredths)	0.36%
Average balance of repurchase agreements	$221,200,000
Federal Funds Purchased [Member]
Short-term Debt [Line Items]
Average interest rate (in hundredths)	0.15%

Borrowings_Line_of_Credit_Faci

Borrowings, Line of Credit Facility (Details) (USD $)	12 Months Ended
In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2007
Line of Credit Facility [Line Items]
Basis spread on variable rate (in hundredths)	1.59%	1.59%
Description of variable rate basis	three-month LIBOR	three-month LIBOR
Maturity date of line of credit	1-Jun-37
Revolving Credit Promissory Note [Member]
Line of Credit Facility [Line Items]
Available amount under line of credit	12
Basis spread on variable rate (in hundredths)	2.00%
Description of variable rate basis	one-month LIBOR
Commitment fee (in hundredths)	0.15%
Maturity date of line of credit	30-Oct-15

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Components of the provision for income taxes [Abstract]
Current income tax expense	$20,194,000	$19,418,000	$14,784,000
Deferred income tax expense (benefit)	-1,048,000	582,000	5,441,000
Total income tax expense	19,146,000	20,000,000	20,225,000
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]
Computed at the statutory rate	21,839,000	22,810,000	22,781,000
Adjustments resulting from [Abstract]
Tax-exempt interest	-1,204,000	-1,126,000	-1,278,000
Housing and new markets credits	-1,076,000	-996,000	-704,000
Dividends received deduction	-178,000	-291,000	-202,000
Bank owned life insurance	-503,000	-791,000	-470,000
ESOP dividend deduction	-284,000	-281,000	-271,000
Other, net	552,000	675,000	369,000
Total income tax expense	19,146,000	20,000,000	20,225,000
Reconciliation of income tax expense at the statutory rate to actual income tax expense [Abstract]
Computed at the statutory rate (in hundredths)	35.00%	35.00%	35.00%
Adjustment resulting from [Abstract]
Tax-exempt interest (in hundredths)	-1.93%	-1.73%	-1.96%
Housing and new markets credits (in hundredths)	-1.72%	-1.52%	-1.08%
Dividends received deduction (in hundredths)	-0.29%	-0.45%	-0.31%
Bank owned life insurance (in hundredths)	-0.81%	-1.22%	-0.72%
ESOP dividend deduction (in hundredths)	-0.46%	-0.43%	-0.42%
Other, net (in hundredths)	0.88%	1.04%	0.56%
Total (in hundredths)	30.68%	30.69%	31.07%
Deferred tax assets [Abstract]
Allowance for loan and lease losses	12,019,000	11,820,000
Interest on nonperforming loans	1,039,000	732,000
Accrued expenses	1,911,000	3,370,000
Allowance for other real estate owned	1,901,000	2,232,000
Unrealized losses on AFS securities	0	3,717,000
Other	1,145,000	232,000
Total deferred tax assets	18,015,000	22,103,000
Deferred tax liabilities [Abstract]
Depreciation and amortization	-19,181,000	-18,717,000
FHLB stock dividends	-3,460,000	-4,956,000
Loan fee income	-744,000	-724,000
Mortgage servicing rights	-1,039,000	-1,198,000
Capitalized lease obligations	-681,000	-1,145,000
Unrealized gains on AFS securities	-1,231,000	0
Other	-1,171,000	-1,015,000
Total deferred tax liabilities	-27,507,000	-27,755,000
Net deferred tax liability	($9,492,000)	($5,652,000)

Employee_Benefits_Details

Employee Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 31, 2012
	H
	Plan
Employee Benefits [Abstract]
Number of retirement savings plan	2
Minimum age of employees to participate in plan	21 years
Minimum requisite service period to participate in retirement plans	1 year
Minimum annual working hours required to participate in plan	1,000
Percentage of employee contribution, minimum (in hundredths)	1.00%
Percentage of employee contribution, maximum (in hundredths)	20.00%
Employer matching contribution (in hundredths)	50.00%
Maximum contribution on employees gross pay (in hundredths)	4.00%
Contribution by employer under 401(K) plan	$1,000,000		$1,000,000	$1,000,000
Number of allocated shares under 401 (K) plan (in shares)	503,082		487,330	551,527
Annual contribution percentage under ESOP (in hundredths)	4.00%
Contributions to ESOP by employer	1,500,000		1,500,000	1,400,000
Number of allocated shares under ESOP (in shares)	752,710		746,260	748,674
Stock Ownership Incentive Plans [Line Items]
Number of active incentive stock option plan	1
Number of inactive incentive stock option plan	1
Number of shares transferred from one plan to another plan (in shares)	217,826
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]
Shares available for future issuance (in shares)	1,563,702
Shares Available for Future Issuance [Abstract]
Shares available for future issuance (in shares)	1,563,702
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Stock-based compensation expense	900,000		700,000	600,000
Dividends paid on restricted stock shares	121,000		124,000	121,000
Unrecognized compensation cost related to nonvested awards grant date fair value of vested shares and tax benefit realized from option exercises [Abstract]
Unrecognized compensation cost of unvested share-based compensation arrangements granted under the plan at year-end	861,000		1,366,000	1,133,000
Grant date fair value of shares vested for the year	343,000		521,000	34,000
Cash received from option exercises under all share-based payment arrangements for the year	1,163,000		5,306,000	3,137,000
Tax benefit realized for the tax deductions from option exercises of the share-based payment arrangements for the year	93,000		303,000	496,000
Expected period for recognition of unrecognized compensation cost	1 year 10 months 24 days
Stock Options [Member]
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]
Number of shares to be issued upon exercise (in shares)	143,000
Weighted average price (in dollars per share)	$31.47
Shares available for future issuance (in shares)	1,563,702	[1]
Shares Available for Future Issuance [Abstract]
Shares available for future issuance (in shares)	1,563,702	[1]
Black-Scholes option pricing model, weighted average assumptions [Abstract]
Expected option life (in years)	7 years		7 years 6 months	0 years
Expected volatility (in hundredths)	30.77%		39.11%	0.00%
Expected dividend yield (in hundredths)	3.40%		3.74%	0.00%
Risk-free interest rate (in hundredths)	2.01%		1.33%	0.00%
Restricted Stock [Member]
Stock Ownership Incentive Plans [Line Items]
Shares authorized (in shares)	440,000
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]
Number of shares to be issued upon exercise (in shares)		[2]
Weighted average price (in dollars per share)		[3]
Shares available for future issuance (in shares)		[1]
Maximum number of shares to be grant to a participant (in shares)	44,000
Shares Available for Future Issuance [Abstract]
Shares available for future issuance (in shares)		[1]
Restricted Stock Grants, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	107,511		106,561	106,197
Granted (in shares)	4,561		11,904	364
Vested (in shares)	-8,949		-10,954	0
Forfeited (in shares)	-1,814		0	0
Outstanding, end of period (in shares)	101,309		107,511	106,561
Restricted Stock Grants, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding, beginning of period (in dollars per share)	$25.91		$25.38	$25.37
Granted (in dollars per share)	$37.85		$30.64	$28.11
Vested (in dollars per share)	$28.35		$25.87	$0
Forfeited (in dollars per share)	$28.38		$0	$0
Outstanding, end of period (in dollars per share)	$26.19		$25.91	$25.38
Performance Shares [Member]
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]
Number of shares to be issued upon exercise (in shares)		[4]
Weighted average price (in dollars per share)		[3]
Shares available for future issuance (in shares)		[1]
Maximum amount of shares to be grant to a participant	250,000
Shares Available for Future Issuance [Abstract]
Shares available for future issuance (in shares)		[1]
Stock Appreciation Rights (SARs) [Member]
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]
Number of shares to be issued upon exercise (in shares)		[5]
Weighted average price (in dollars per share)		[3]
Shares available for future issuance (in shares)		[1]
Maximum number of shares to be grant to a participant (in shares)	110,000
Shares Available for Future Issuance [Abstract]
Shares available for future issuance (in shares)		[1]
1998 Stock Option Plan [Member]
Stock Ownership Incentive Plans [Line Items]
Shares authorized (in shares)	1,151,514
Restricted Stock Grants, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	0
Outstanding, end of period (in shares)	0
Unrecognized compensation cost related to nonvested awards grant date fair value of vested shares and tax benefit realized from option exercises [Abstract]
Weighted average remaining contractual term	1 year 0 months 11 days
1998 Stock Option Plan [Member] | Stock Options [Member]
Options, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	78,066		195,279	353,694
Granted (in shares)	0		0	0
Exercised (in shares)	-34,106		-117,213	-158,305
Forfeited/expired (in shares)	0		0	-110
Outstanding, end of period (in shares)	43,960		78,066	195,279
Exercisable, end of period (in shares)	43,960		78,066	195,279
Options, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share)	$28.91		$28.08	$24.41
Granted (in dollars per share)	$0		$0	$0
Exercised (in dollars per share)	$28.25		$27.54	$19.85
Forfeited/expired (in dollars per share)	$0		$0	$29.49
Outstanding, end of period (in dollars per share)	$29.43		$28.91	$28.08
Exercisable, end of period (in dollars per share)	$29.43		$28.91	$28.08
Nonvested Options, Number of Shares [Roll Forward]
Granted (in shares)	0		0	0
Nonvested Options, Weighted Average Grant Date Fair Value [Abstract]
Intrinsic value of options exercised	270,000		1,175,000	690,000
Intrinsic value of options exercisable	316,000		948,000	1,517,000
Intrinsic value of outstanding options	316,000		948,000	1,517,000
2006 Stock Ownership Incentive Plan [Member]
Stock Ownership Incentive Plans [Line Items]
Shares authorized (in shares)	1,650,000
Shares available for future grants (in shares)	1,345,876
Number of shares to be issued upon exercise of outstanding stock-based awards and remaining shares available for future issuance [Abstract]
Shares available for future issuance (in shares)	1,563,702		1,573,980
Shares Available for Future Issuance [Abstract]
Shares available at January 1, 2014 (in shares)	1,573,980
1998 Plan forfeitures in 2014 (in shares)	0
2006 Plan stock option issuances for 2014 (in shares)	-10,000
2006 Plan restricted stock issuances in 2014 (in shares)	-4,561
2006 Plan forfeitures in 2014 (in shares)	4,283
Shares available for future issuance (in shares)	1,563,702		1,573,980
Nonvested Options, Weighted Average Grant Date Fair Value [Abstract]
Granted (in dollars per share)	$7.76		$8.23
Weighted average fair value of options granted	80,000		10,000
Weighted average fair value per share of options granted (in dollars per share)	$7.76		$8.23
Unrecognized compensation cost related to nonvested awards grant date fair value of vested shares and tax benefit realized from option exercises [Abstract]
Weighted average remaining contractual term	3 years 4 months 6 days
2006 Stock Ownership Incentive Plan [Member] | Stock Options [Member]
Options, Number of Shares [Roll Forward]
Outstanding, beginning of period (in shares)	97,047		163,524	167,828
Granted (in shares)	10,000		1,650	0
Exercised (in shares)	-5,757		-68,127	-3,507
Forfeited/expired (in shares)	-2,469		0	-797
Outstanding, end of period (in shares)	98,821		97,047	163,524
Exercisable, end of period (in shares)	86,264		92,997	112,555
Options, Weighted Average Exercise Price [Abstract]
Outstanding, beginning of period (in dollars per share)	$32.29		$31.56	$31.43
Granted (in dollars per share)	$34.75		$30.64	$0
Exercised (in dollars per share)	$34.62		$30.52	$25.92
Forfeited/expired (in dollars per share)	$34.29		$0	$0
Outstanding, end of period (in dollars per share)	$32.35		$32.29	$31.56
Exercisable, end of period (in dollars per share)	$32.25		$32.56	$34.26
Nonvested Options, Number of Shares [Roll Forward]
Nonvested, beginning of period (in shares)	4,051
Granted (in shares)	10,000		1,650	0
Vested (in shares)	-1,274
Forfeited (in shares)	-220
Nonvested, end of period (in shares)	12,557		4,051
Nonvested Options, Weighted Average Grant Date Fair Value [Abstract]
Nonvested, beginning of period (in dollars per share)	$6.87
Granted (in dollars per share)	$7.76
Vested (in dollars per share)	$6.68
Forfeited (in dollars per share)	$5.94
Nonvested, end of period (in dollars per share)	$7.61		$6.87
Weighted average fair value per share of options granted (in dollars per share)	$7.76
Intrinsic value of options exercised	11,000		477,000	22,000
Intrinsic value of options exercisable	376,000		790,000	88,000
Intrinsic value of outstanding options	$421,000		$849,000	$388,000
[1]	Under the 2006 Plan, 1.65 million shares (plus any shares reserved for issuance under the 1998 Stock Option Plan) were authorized for issuance as nonqualified and incentive stock options, SARS, restricted stock and performance units. As of December 31, 2014, the above shares remained available for issuance.
[2]	The maximum number of shares of restricted stock that may be granted is 440,000 shares, and the maximum that may be granted to a participant during any calendar year is 44,000 shares.
[3]	Not applicable
[4]	No performance units payable in stock had been issued as of December 31, 2014. The maximum payment that can be made pursuant to performance units granted to any one participant in any calendar year shall be $250,000.
[5]	No SARS have been issued. The maximum number of shares with respect to which SARs may be granted to a participant during any calendar year shall be 110,000 shares.

Operating_Leases_Details

Operating Leases (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Payments [Abstract]
2015	$1,970,000
2016	1,411,000
2017	1,270,000
2018	862,000
2019	356,000
Thereafter	2,781,000
Total	8,650,000
Receipts [Abstract]
2015	577,000
2016	339,000
2017	210,000
2018	78,000
2019	4,000
Thereafter	0
Total	1,208,000
Rental expense net of rental income under operating leases	$1,300,000	$1,200,000	$800,000

Fair_Market_Value_of_Financial2

Fair Market Value of Financial Assets and Liabilities (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Impaired loan (collateral dependent) [Abstract]
Impaired loans, fair value adjustments	$400,000	$600,000
Other real estate owned [Abstract]
Other real estate /assets owned, fair value adjustment	1,700,000	2,500,000
Typical frequency of periodic reviews, minimum	12 months
Typical frequency of periodic reviews, maximum	18 months
Maximum frequency of periodic reviews	24 months
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Total recognized gains (losses) Included in net income	-830,000	206,000
Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date	-830,000	206,000
Total gains (losses), noninterest income	-830,000	206,000
Total gains (losses), noninterest expense	0	0
Recurring [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	188,932,000	72,623,000
State and political subdivisions	137,458,000	116,703,000
U.S. government sponsored agency mortgage-backed securities	288,907,000	367,297,000
Marketable equity securities	24,889,000	52,782,000
Mortgage servicing rights	2,968,000	3,424,000
Recurring [Member] | Mortgage Servicing Rights [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning balance	3,424,000	2,364,000
Total recognized gains (losses) Included in net income	-467,000	788,000
Issues	374,000	854,000
Settlements	-363,000	-582,000
Ending balance	2,968,000	3,424,000
Total gains (losses) for the period included in net income attributable to the change in unrealized gains or losses related to assets still held at the reporting date	-467,000	788,000
Total gains (losses), noninterest income	-467,000	788,000
Recurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	0	0
State and political subdivisions	0	0
U.S. government sponsored agency mortgage-backed securities	0	0
Marketable equity securities	24,889,000	52,782,000
Mortgage servicing rights	0	0
Recurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	188,932,000	72,623,000
State and political subdivisions	137,458,000	116,703,000
U.S. government sponsored agency mortgage-backed securities	288,907,000	367,297,000
Marketable equity securities	0	0
Mortgage servicing rights	0	0
Recurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Available-for-sale securities [Abstract]
U.S. Treasury and government agencies	0	0
State and political subdivisions	0	0
U.S. government sponsored agency mortgage-backed securities	0	0
Marketable equity securities	0	0
Mortgage servicing rights	2,968,000	3,424,000
Nonrecurring [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	4,665,000	6,830,000
Other real estate /assets owned	6,472,000	11,111,000
Nonrecurring [Member] | Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	0	0
Other real estate /assets owned	0	0
Nonrecurring [Member] | Significant Other Observable Inputs (Level 2) [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	0	0
Other real estate /assets owned	0	0
Nonrecurring [Member] | Significant Unobservable Inputs (Level 3) [Member]
Assets measured-nonrecurring basis [Abstract]
Impaired loans (collateral dependent)	4,665,000	6,830,000
Other real estate /assets owned	$6,472,000	$11,111,000

Fair_Market_Value_of_Financial3

Fair Market Value of Financial Assets and Liabilities, Quantitative Information about Level 3 Fair Value Measurements (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	2,968	3,424
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Constant prepayment rate (in hundredths)	4.60%	4.30%
Probability of default (in hundredths)	0.00%	0.00%
Discount rate (in hundredths)	10.00%
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Constant prepayment rate (in hundredths)	25.10%	23.60%
Probability of default (in hundredths)	100.00%	33.33%
Discount rate (in hundredths)	11.50%
Mortgage Servicing Rights [Member] | Discount Cash Flows, Computer Pricing Model [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Constant prepayment rate (in hundredths)	11.30%	9.70%
Probability of default (in hundredths)	3.61%	3.36%
Discount rate (in hundredths)	10.13%	10.00%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	4,665	6,830
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Marketability discount (in hundredths)	5.00%	5.00%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Marketability discount (in hundredths)	10.00%	10.00%
Impaired Loans (Collateral Dependent) [Member] | Market Comparable Properties [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Marketability discount (in hundredths)	7.00%	7.00%
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Fair value	6,472	11,111
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] | Minimum [Member]
Unobservable inputs [Abstract]
Comparability adjustments (in hundredths)	3.00%	5.00%
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] | Maximum [Member]
Unobservable inputs [Abstract]
Comparability adjustments (in hundredths)	67.00%	38.00%
Other Real Estate/Asset Owned [Member] | Market Comparable Properties [Member] | Weighted Average [Member]
Unobservable inputs [Abstract]
Comparability adjustments (in hundredths)	18.00%	9.00%

Fair_Market_Value_of_Financial4

Fair Market Value of Financial Assets and Liabilities, Estimated Fair Value Of Financial Instruments and Indication of Level Within Fair Value Hierarchy of Valuation Techniques (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financial assets [Abstract]
Securities available-for-sale	$640,186	$609,405
Securities held-to-maturity	1,644	1,601
Mortgage servicing rights	2,968	3,424	2,364	2,282
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Financial assets [Abstract]
Cash and cash equivalents	105,517	106,641
Certificates of deposits in other banks	0	0
Securities available-for-sale	24,889	52,782
Securities held-to-maturity	0	0
Loans held for sale	2,321	845
Loans, net	0	0
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	677,626	621,321
Repurchase agreements	0	0
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	0	0
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Significant Other Observable Inputs (Level 2) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	8,213	9,582
Securities available-for-sale	615,297	556,623
Securities held-to-maturity	1,644	1,601
Loans held for sale	0	0
Loans, net	0	0
Federal Home Loan Bank stock	17,927	25,673
Federal Reserve Bank stock	4,869	4,886
Accrued interest receivable	13,548	12,886
Mortgage servicing rights	0	0
Financial liabilities [Abstract]
Deposits	2,192,848	2,230,608
Repurchase agreements	0	0
Federal funds purchased	11,041	12,465
Advances from Federal Home Loan Bank	61,106	1,531
Long-term debt	0	0
Accrued interest payable	908	1,032
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Significant Unobservable Inputs (Level 3) [Member]
Financial assets [Abstract]
Cash and cash equivalents	0	0
Certificates of deposits in other banks	0	0
Securities available-for-sale	0	0
Securities held-to-maturity	0	0
Loans held for sale	0	0
Loans, net	2,691,906	2,589,811
Federal Home Loan Bank stock	0	0
Federal Reserve Bank stock	0	0
Accrued interest receivable	0	0
Mortgage servicing rights	2,968	3,424
Financial liabilities [Abstract]
Deposits	0	0
Repurchase agreements	235,193	207,992
Federal funds purchased	0	0
Advances from Federal Home Loan Bank	0	0
Long-term debt	35,615	31,362
Accrued interest payable	0	0
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	0	0
Carrying Amount [Member]
Financial assets [Abstract]
Cash and cash equivalents	105,517	106,641
Certificates of deposits in other banks	8,197	9,568
Securities available-for-sale	640,186	609,405
Securities held-to-maturity	1,662	1,662
Loans held for sale	2,264	828
Loans, net	2,699,377	2,581,346
Federal Home Loan Bank stock	17,927	25,673
Federal Reserve Bank stock	4,869	4,886
Accrued interest receivable	13,548	12,886
Mortgage servicing rights	2,968	3,424
Financial liabilities [Abstract]
Deposits	2,874,257	2,855,074
Repurchase agreements	235,186	208,067
Federal funds purchased	11,041	12,465
Advances from Federal Home Loan Bank	61,170	1,286
Long-term debt	61,341	61,341
Accrued interest payable	908	1,032
Unrecognized financial instruments [Abstract]
Letters of credit	0	0
Commitments to extend credit	0	0
Forward sale commitments	$0	$0

OffBalance_Sheet_Transactions_2

Off-Balance Sheet Transactions and Guarantees (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	$487,904,000	$445,664,000
Percentage of secured standby letters of credit (in hundredths)	81.00%
Standby letters of credit secured by cash	20,600,000
Fixed rate loan commitments amount	36,600,000
Period of commitment to sell the loans at specified prices	60 days
Total mortgage loans in process	300,000	1,600,000
Mortgage loans held for sale	2,300,000	800,000
Minimum [Member]
Off-balance sheet risks [Line Items]
Interest rate on loan commitments (in hundredths)	3.50%
Maximum [Member]
Off-balance sheet risks [Line Items]
Interest rate on loan commitments (in hundredths)	5.00%
Fixed rate loan commitments term	1 year
Standby Letters of Credit [Member]
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	28,524,000	34,861,000
Credit loss reserve	4,000
Commitments to Extend Additional Credit [Member]
Off-balance sheet risks [Line Items]
Total off-balance sheet financial instruments	459,380,000	410,803,000
Credit loss reserve	$223,000

Concentrations_of_Credit_Risk_

Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Lessors of Non-residential Buildings [Member]
Concentration Risk [Line Items]
Concentration of credit risk (in hundredths)	39.00%	33.00%
Lessors of Residential Buildings and Dwellings Credits [Member]
Concentration Risk [Line Items]
Concentration of credit risk (in hundredths)	34.00%	34.00%
Hotel/Motel Industry Credits [Member]
Concentration Risk [Line Items]
Concentration of credit risk (in hundredths)	31.00%	33.00%

Regulatory_Matters_Details

Regulatory Matters (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Document
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Restricted core capital elements (in hundredths)	25.00%
Transition period of final rule	5 years
Tier I capital (to average assets), Amount [Abstract]
Actual Amount	$439,877,000	$412,053,000
For Capital Adequacy Purposes	146,139,000	143,198,000
Tier I capital (to average assets), Ratio [Abstract]
Actual Ratio (in hundredths)	12.04%	11.51%
For Capital Adequacy Purposes (in hundredths)	4.00%	4.00%
Tier I capital (to risk weighted assets), Amount [Abstract]
Actual Amount	439,877,000	412,053,000
For Capital Adequacy Purposes	106,572,000	102,056,000
Tier I capital (to risk weighted assets), Ratio [Abstract]
Actual Ratio (in hundredths)	16.51%	16.15%
For Capital Adequacy Purposes (in hundredths)	4.00%	4.00%
Total capital (to risk weighted assets), Amount [Abstract]
Actual Amount	473,097,000	443,875,000
For Capital Adequacy Purposes	213,107,000	204,080,000
Total capital (to risk-weighted assets), Ratio [Abstract]
Actual Ratio (in hundredths)	17.76%	17.40%
For Capital Adequacy Purposes (in hundredths)	8.00%	8.00%
Number of consultative documents released by the Basel Committee	2
Maximum countercyclical buffer specified as percentage of common equity Tier 1 capital (in hundredths)	2.50%
Assets threshold for advanced approach banks	250,000,000,000
Foreign exposures threshold for advanced approach banks	10,000,000,000
Total assets threshold for small depository institution	15,000,000,000
Minimum assets for top tier banking organizations for disclosure requirements	50,000,000,000
Minimum consolidated assets for banks to which top tier banking organizations apply	250,000,000,000
Community Trust Bank, Inc [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Maximum dividend without Approval	53,200,000
Tier I capital (to average assets), Amount [Abstract]
Actual Amount	416,861,000	392,932,000
For Capital Adequacy Purposes	145,374,000	142,496,000
To Be Well-Capitalized Under Prompt Corrective Action Provision	181,718,000	178,120,000
Tier I capital (to average assets), Ratio [Abstract]
Actual Ratio (in hundredths)	11.47%	11.03%
For Capital Adequacy Purposes (in hundredths)	4.00%	4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths)	5.00%	5.00%
Tier I capital (to risk weighted assets), Amount [Abstract]
Actual Amount	416,861,000	392,932,000
For Capital Adequacy Purposes	106,274,000	101,730,000
To Be Well-Capitalized Under Prompt Corrective Action Provision	159,411,000	152,595,000
Tier I capital (to risk weighted assets), Ratio [Abstract]
Actual Ratio (in hundredths)	15.69%	15.45%
For Capital Adequacy Purposes (in hundredths)	4.00%	4.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths)	6.00%	6.00%
Total capital (to risk weighted assets), Amount [Abstract]
Actual Amount	450,081,000	424,754,000
For Capital Adequacy Purposes	212,553,000	203,475,000
To Be Well-Capitalized Under Prompt Corrective Action Provision	$265,691,000	$254,344,000
Total capital (to risk-weighted assets), Ratio [Abstract]
Actual Ratio (in hundredths)	16.94%	16.70%
For Capital Adequacy Purposes (in hundredths)	8.00%	8.00%
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths)	10.00%	10.00%
CTBI and CTB [Member] | Rules in 2015 [Member]
Tier I capital (to risk weighted assets), Ratio [Abstract]
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths)	8.00%
Total capital (to risk-weighted assets), Ratio [Abstract]
To Be Well-Capitalized Under Prompt Corrective Action Provision (in hundredths)	10.00%
Common equity Tier 1 capital ratio under well capitalized (in hundredths)	6.50%
Tier 1 leverage ratio under well capitalized (in hundredths)	5.00%
CTBI and CTB [Member] | Rules from 2015 to 2019 [Member]
Tier I capital (to risk weighted assets), Ratio [Abstract]
For Capital Adequacy Purposes (in hundredths)	6.00%
Total capital (to risk-weighted assets), Ratio [Abstract]
For Capital Adequacy Purposes (in hundredths)	8.00%
Common equity Tier one capital ratio (in hundredths)	4.50%
Tier 1 leverage ratio (in hundredths)	4.00%
Capital conservation buffer in 2016 (in hundredths)	0.63%
Capital conservation buffer in 2017 (in hundredths)	1.25%
Capital conservation buffer in 2018 (in hundredths)	1.88%
Capital conservation buffer in 2019 and thereafter (in hundredths)	2.50%
CTBI and CTB [Member] | Rules in 2019 [Member]
Tier I capital (to risk weighted assets), Ratio [Abstract]
For Capital Adequacy Purposes (in hundredths)	8.50%
Total capital (to risk-weighted assets), Ratio [Abstract]
For Capital Adequacy Purposes (in hundredths)	10.50%
Common equity Tier one capital ratio (in hundredths)	7.00%

Parent_Company_Financial_State2

Parent Company Financial Statements (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Assets:
Cash on deposit	$56,299	$64,828
Goodwill	65,490	65,490
Premises and equipment, net	49,980	52,000
Other assets	27,378	27,228
Total assets	3,723,765	3,581,716
Liabilities and shareholders' equity:
Other liabilities	32,893	30,991
Total liabilities	3,275,888	3,169,224
Shareholders' equity	447,877	412,492
Total liabilities and shareholders' equity	3,723,765	3,581,716
Expenses:
Interest expense	11,797	13,440	21,588
Other expenses	15,260	20,638	16,053
Income before income taxes and equity in undistributed income of subsidiaries	62,397	65,172	65,087
Income tax benefit	19,146	20,000	20,225
Net income	43,251	45,172	44,862
Unrealized holding gains (losses) on securities available-for-sale
Unrealized holding gains (losses) arising during the period	13,928	-31,878	4,973
Less: Reclassification adjustments for realized (gains) losses included in net income	211	45	-1,155
Other comprehensive income (loss), net of tax	9,190	-20,691	2,482
Comprehensive income	52,441	24,481	47,344
Cash flows from operating activities:
Net income	43,251	45,172	44,862
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	4,314	4,562	4,324
Stock-based compensation	852	698	592
Excess tax benefits of stock-based compensation	760	572	496
Changes in:
Other assets	-60	4,647	1,792
Other liabilities	-1,339	323	7,130
Net cash provided by operating activities	57,528	90,716	57,896
Cash flows from investing activities:
Purchase of premises and equipment	-2,081	-2,105	-4,301
Net cash used in investing activities	-144,076	-122,046	-70,963
Cash flows from financing activities:
Issuance of common stock	1,992	6,348	4,395
Excess tax benefits of stock-based compensation	-760	-572	-496
Dividends paid	-20,570	-24,546	-19,215
Net cash provided by (used in) financing activities	85,424	-69,589	-17,854
Net decrease in cash and cash equivalents	-1,124	-100,919	-30,921
Cash and cash equivalents at beginning of year	106,641	207,560	238,481
Cash and cash equivalents at end of year	105,517	106,641	207,560
Parent Company [Member]
Assets:
Cash on deposit	995	1,272
Investment in and advances to subsidiaries	503,252	468,240
Goodwill	4,973	4,973
Premises and equipment, net	207	235
Other assets	1,173	617
Total assets	510,600	475,337
Liabilities and shareholders' equity:
Long-term debt	61,341	61,341
Other liabilities	1,382	1,504
Total liabilities	62,723	62,845
Shareholders' equity	447,877	412,492
Total liabilities and shareholders' equity	510,600	475,337
Income:
Dividends from subsidiary banks	19,534	13,035	16,572
Other income	196	545	238
Total income	19,730	13,580	16,810
Expenses:
Interest expense	1,131	1,161	2,403
Depreciation expense	153	163	127
Other expenses	2,550	2,442	1,990
Total expenses	3,834	3,766	4,520
Income before income taxes and equity in undistributed income of subsidiaries	15,896	9,814	12,290
Income tax benefit	-1,548	-1,416	-1,750
Income before equity in undistributed income of subsidiaries	17,444	11,230	14,040
Equity in undistributed income of subsidiaries	25,807	33,942	30,822
Net income	43,251	45,172	44,862
Unrealized holding gains (losses) on securities available-for-sale
Unrealized holding gains (losses) arising during the period	13,928	-31,878	4,973
Less: Reclassification adjustments for realized (gains) losses included in net income	211	45	-1,155
Tax expense (benefit)	4,949	-11,142	1,336
Other comprehensive income (loss), net of tax	9,190	-20,691	2,482
Comprehensive income	52,441	24,481	47,344
Cash flows from operating activities:
Net income	43,251	45,172	44,862
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	153	163	127
Equity in undistributed earnings of subsidiaries	-25,807	-33,942	-30,822
Stock-based compensation	838	658	512
Excess tax benefits of stock-based compensation	760	572	496
Changes in:
Other assets	-558	660	-771
Other liabilities	563	1,505	495
Net cash provided by operating activities	19,200	14,788	14,899
Cash flows from investing activities:
Purchase of premises and equipment	-125	-148	-166
Repayment of investments in and advances to subsidiaries	-14	-40	-80
Net cash used in investing activities	-139	-188	-246
Cash flows from financing activities:
Issuance of common stock	1,992	6,348	4,395
Excess tax benefits of stock-based compensation	-760	-572	-496
Dividends paid	-20,570	-24,546	-19,215
Net cash provided by (used in) financing activities	-19,338	-18,770	-15,316
Net decrease in cash and cash equivalents	-277	-4,170	-663
Cash and cash equivalents at beginning of year	1,272	5,442	6,105
Cash and cash equivalents at end of year	$995	$1,272	$5,442

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Numerator [Abstract]
Net income	$43,251	$45,172	$44,862
Basic earnings per share [Abstract]
Weighted average shares (in shares)	17,326,000	17,158,000	17,013,000
Diluted earnings per share [Abstract]
Dilutive effect of equity grants (in shares)	71,000	82,000	60,000
Adjusted weighted average shares (in shares)	17,397,000	17,240,000	17,073,000
Earnings per share [Abstract]
Basic earnings per share (in dollars per share)	$2.50	$2.63	$2.64
Diluted earnings per share (in dollars per share)	$2.49	$2.62	$2.63
Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options excluded from diluted calculations (in shares)	0	65,519	98,720
Weighted average price of outstanding options (in dollars per share)	$0	$35.41	$35.41

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Tax (benefit) expense	$19,146	$20,000	$20,225
Net income	43,251	45,172	44,862
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification Out Of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Securities gains (losses)	-211	-45	1,155
Tax (benefit) expense	-74	-15	405
Net income	($137)	($30)	$750