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Loans, Credit Risk Profile Based on Rating Category and Payment Activity and on Performing and Nonperforming Status, Segregated by Class (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Credit Risk Profile, Segregated by Class [Abstract]
Total	$ 3,408,813	$ 3,554,211
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process	2,300	2,900
Commercial [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	553,686	599,119
2020/2019	239,577	253,159
2019/2018	196,051	200,954
2018/2017	146,490	171,851
2017/2016	120,432	171,600
Prior	311,172	304,879
Revolving Loans	190,045	191,965
Total	1,757,453	1,893,527
Commercial [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	517,860	549,796
2020/2019	209,688	233,331
2019/2018	174,914	168,142
2018/2017	125,833	151,432
2017/2016	109,211	134,594
Prior	247,757	257,363
Revolving Loans	176,157	183,151
Total	$ 1,561,420	1,677,809
Commercial [Member] | Pass [Member] | Minimum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Review period for loans	12 months
Commercial [Member] | Pass [Member] | Maximum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Review period for loans	18 months
Commercial [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	$ 24,203	33,686
2020/2019	21,212	8,273
2019/2018	16,338	12,009
2018/2017	14,300	11,985
2017/2016	7,219	24,744
Prior	50,350	24,369
Revolving Loans	13,062	8,290
Total	146,684	123,356
Commercial [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	1,946
2020/2019	0	4,241
2019/2018	268	15,023
2018/2017	383	323
2017/2016	28	496
Prior	179	3,382
Revolving Loans	502	239
Total	1,360	25,650
Commercial [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	11,623	13,691
2020/2019	8,677	7,314
2019/2018	4,531	5,780
2018/2017	5,974	8,111
2017/2016	3,974	11,766
Prior	12,578	19,737
Revolving Loans	324	285
Total	47,681	66,684
Commercial [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	308	28
Revolving Loans	0	0
Total	308	28
Commercial [Member] | Hotel/Motel [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	51,290	35,458
2020/2019	25,252	75,003
2019/2018	62,526	40,395
2018/2017	30,887	42,866
2017/2016	36,518	31,937
Prior	50,589	35,040
Revolving Loans	0	0
Total	257,062	260,699
Commercial [Member] | Hotel/Motel [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	42,056	11,507
2020/2019	11,231	70,504
2019/2018	53,713	27,453
2018/2017	18,752	39,651
2017/2016	32,765	6,357
Prior	20,087	22,372
Revolving Loans	0	0
Total	178,604	177,844
Commercial [Member] | Hotel/Motel [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	9,234	23,951
2020/2019	14,021	2,506
2019/2018	8,813	3,366
2018/2017	8,780	2,102
2017/2016	2,678	16,740
Prior	30,502	7,422
Revolving Loans	0	0
Total	74,028	56,087
Commercial [Member] | Hotel/Motel [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	1,993
2019/2018	0	9,576
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	11,569
Commercial [Member] | Hotel/Motel [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	3,355	1,113
2017/2016	1,075	8,840
Prior	0	5,246
Revolving Loans	0	0
Total	4,430	15,199
Commercial [Member] | Hotel/Motel [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Real Estate Residential [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	149,829	93,339
2020/2019	58,729	43,419
2019/2018	24,902	33,931
2018/2017	23,780	24,570
2017/2016	13,085	27,029
Prior	55,208	54,988
Revolving Loans	9,700	10,652
Total	335,233	287,928
Commercial [Member] | Commercial Real Estate Residential [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	142,364	85,403
2020/2019	54,380	39,238
2019/2018	22,320	29,179
2018/2017	19,826	17,390
2017/2016	11,919	21,272
Prior	45,791	46,419
Revolving Loans	9,544	10,470
Total	306,144	249,371
Commercial [Member] | Commercial Real Estate Residential [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	2,643	1,714
2020/2019	2,359	2,214
2019/2018	1,962	2,438
2018/2017	2,119	2,962
2017/2016	554	4,520
Prior	6,949	5,306
Revolving Loans	156	182
Total	16,742	19,336
Commercial [Member] | Commercial Real Estate Residential [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	1,921
2020/2019	0	1,361
2019/2018	0	323
2018/2017	0	142
2017/2016	16	129
Prior	0	0
Revolving Loans	0	0
Total	16	3,876
Commercial [Member] | Commercial Real Estate Residential [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	4,822	4,301
2020/2019	1,990	606
2019/2018	620	1,991
2018/2017	1,835	4,076
2017/2016	596	1,108
Prior	2,468	3,263
Revolving Loans	0	0
Total	12,331	15,345
Commercial [Member] | Commercial Real Estate Residential [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Real Estate Nonresidential [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	224,894	137,592
2020/2019	107,094	107,418
2019/2018	90,131	86,299
2018/2017	60,799	89,244
2017/2016	61,093	105,118
Prior	190,506	191,112
Revolving Loans	23,376	26,455
Total	757,893	743,238
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	214,563	125,205
2020/2019	99,131	97,204
2019/2018	82,386	77,685
2018/2017	57,397	80,416
2017/2016	55,422	100,740
Prior	168,533	165,839
Revolving Loans	22,389	25,524
Total	699,821	672,613
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	5,130	5,133
2020/2019	2,865	3,175
2019/2018	3,981	5,075
2018/2017	2,802	6,366
2017/2016	3,655	3,020
Prior	11,828	11,046
Revolving Loans	767	601
Total	31,028	34,416
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	887
2019/2018	0	68
2018/2017	0	0
2017/2016	0	0
Prior	178	3,382
Revolving Loans	20	115
Total	198	4,452
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	5,201	7,254
2020/2019	5,098	6,152
2019/2018	3,764	3,471
2018/2017	600	2,462
2017/2016	2,016	1,358
Prior	9,659	10,817
Revolving Loans	200	215
Total	26,538	31,729
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	308	28
Revolving Loans	0	0
Total	308	28
Commercial [Member] | Dealer Floorplans [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	69,452	69,087
Total	69,452	69,087
Commercial [Member] | Dealer Floorplans [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	69,105	68,610
Total	69,105	68,610
Commercial [Member] | Dealer Floorplans [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	347	477
Total	347	477
Commercial [Member] | Dealer Floorplans [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Dealer Floorplans [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Dealer Floorplans [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Other [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	81,446	80,063
2020/2019	47,394	27,319
2019/2018	18,492	40,329
2018/2017	31,024	15,171
2017/2016	9,736	7,516
Prior	14,869	23,739
Revolving Loans	87,517	85,771
Total	290,478	279,908
Commercial [Member] | Commercial Other [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	72,650	75,014
2020/2019	43,838	26,385
2019/2018	16,495	33,825
2018/2017	29,858	13,975
2017/2016	9,105	6,225
Prior	13,346	22,733
Revolving Loans	75,119	78,547
Total	260,411	256,704
Commercial [Member] | Commercial Other [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	7,196	2,888
2020/2019	1,967	378
2019/2018	1,582	1,130
2018/2017	599	555
2017/2016	332	464
Prior	1,071	595
Revolving Loans	11,792	7,030
Total	24,539	13,040
Commercial [Member] | Commercial Other [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	25
2020/2019	0	0
2019/2018	268	5,056
2018/2017	383	181
2017/2016	12	367
Prior	1	0
Revolving Loans	482	124
Total	1,146	5,753
Commercial [Member] | Commercial Other [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	1,600	2,136
2020/2019	1,589	556
2019/2018	147	318
2018/2017	184	460
2017/2016	287	460
Prior	451	411
Revolving Loans	124	70
Total	4,382	4,411
Commercial [Member] | Commercial Other [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Unsecured SBA PPP [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	46,227	252,667
2020/2019	1,108	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	47,335	252,667
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	46,227	252,667
2020/2019	1,108	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	47,335	252,667
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Residential [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	195,731	214,629
2020/2019	161,534	119,737
2019/2018	76,216	57,115
2018/2017	37,552	61,229
2017/2016	43,155	48,628
Prior	264,426	295,878
Revolving Loans	95,238	91,113
Total	873,852	888,329
Residential [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	195,731	214,629
2020/2019	161,471	119,301
2019/2018	75,792	56,812
2018/2017	37,188	60,915
2017/2016	42,597	48,276
Prior	256,575	287,932
Revolving Loans	94,666	90,724
Total	864,020	878,589
Residential [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	63	436
2019/2018	424	303
2018/2017	364	314
2017/2016	558	352
Prior	7,851	7,946
Revolving Loans	572	389
Total	9,832	9,740
Residential [Member] | Real Estate Mortgage [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	195,731	214,629
2020/2019	161,534	119,737
2019/2018	76,216	57,115
2018/2017	37,552	61,229
2017/2016	43,155	48,605
Prior	252,997	283,244
Revolving Loans	0	0
Total	767,185	784,559
Residential [Member] | Real Estate Mortgage [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	195,731	214,629
2020/2019	161,471	119,301
2019/2018	75,792	56,812
2018/2017	37,188	60,915
2017/2016	42,597	48,253
Prior	245,666	275,883
Revolving Loans	0	0
Total	758,445	775,793
Residential [Member] | Real Estate Mortgage [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	63	436
2019/2018	424	303
2018/2017	364	314
2017/2016	558	352
Prior	7,331	7,361
Revolving Loans	0	0
Total	8,740	8,766
Residential [Member] | Home Equity Lines [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	23
Prior	11,429	12,634
Revolving Loans	95,238	91,113
Total	106,667	103,770
Residential [Member] | Home Equity Lines [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	23
Prior	10,909	12,049
Revolving Loans	94,666	90,724
Total	105,575	102,796
Residential [Member] | Home Equity Lines [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
2017/2016	0	0
Prior	520	585
Revolving Loans	572	389
Total	1,092	974
Consumer [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	334,777	374,205
2020/2019	229,596	168,288
2019/2018	99,308	119,061
2018/2017	64,939	59,881
2017/2016	27,965	30,388
Prior	20,923	20,532
Revolving Loans	0	0
Total	777,508	772,355
Consumer [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	334,753	374,171
2020/2019	229,457	168,116
2019/2018	99,285	118,943
2018/2017	64,905	59,822
2017/2016	27,939	30,358
Prior	20,919	20,521
Revolving Loans	0	0
Total	777,258	771,931
Consumer [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	24	34
2020/2019	139	172
2019/2018	23	118
2018/2017	34	59
2017/2016	26	30
Prior	4	11
Revolving Loans	0	0
Total	250	424
Consumer [Member] | Consumer Direct [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	71,626	72,684
2020/2019	39,316	33,050
2019/2018	18,495	18,461
2018/2017	10,502	9,164
2017/2016	4,493	6,581
Prior	12,251	12,364
Revolving Loans	0	0
Total	156,683	152,304
Consumer [Member] | Consumer Direct [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	71,626	72,677
2020/2019	39,312	32,993
2019/2018	18,492	18,461
2018/2017	10,468	9,157
2017/2016	4,490	6,581
Prior	12,251	12,364
Revolving Loans	0	0
Total	156,639	152,233
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	0	7
2020/2019	4	57
2019/2018	3	0
2018/2017	34	7
2017/2016	3	0
Prior	0	0
Revolving Loans	0	0
Total	44	71
Consumer [Member] | Consumer Indirect [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	263,151	301,521
2020/2019	190,280	135,238
2019/2018	80,813	100,600
2018/2017	54,437	50,717
2017/2016	23,472	23,807
Prior	8,672	8,168
Revolving Loans	0	0
Total	620,825	620,051
Consumer [Member] | Consumer Indirect [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	263,127	301,494
2020/2019	190,145	135,123
2019/2018	80,793	100,482
2018/2017	54,437	50,665
2017/2016	23,449	23,777
Prior	8,668	8,157
Revolving Loans	0	0
Total	620,619	619,698
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021/2020	24	27
2020/2019	135	115
2019/2018	20	118
2018/2017	0	52
2017/2016	23	30
Prior	4	11
Revolving Loans	0	0
Total	$ 206	$ 353

X

- References

No definition available.

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Balance Type:	na
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X

- Definition

Refers to the review period considered for loans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	ctbi_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of financing receivable originated more than five years prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of financing receivable originated four years prior to current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 55
-Paragraph 79
-URI http://asc.fasb.org/extlink&oid=124267575&loc=SL82922352-210448

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=124255953&loc=SL82919232-210447

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

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