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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	6 Months Ended
	Jun. 30, 2022	Dec. 31, 2021
Credit Risk Profile, Segregated by Class [Abstract]
Total	$ 3,558,443	$ 3,408,813
Consumer mortgage loans secured by real estate properties for which formal foreclosure proceedings are in process	4,300	2,300
Commercial [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	275,112	553,686
2021/2020	468,035	239,577
2020/2019	211,526	196,051
2019/2018	176,590	146,490
2018/2017	126,205	120,432
Prior	342,171	311,172
Revolving Loans	197,876	190,045
Total	1,797,515	1,757,453
Commercial [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	261,929	517,860
2021/2020	437,481	209,688
2020/2019	190,976	174,914
2019/2018	161,843	125,833
2018/2017	107,314	109,211
Prior	279,014	247,757
Revolving Loans	184,559	176,157
Total	$ 1,623,116	1,561,420
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]
2022/2021	$ 10,525	24,203
2021/2020	14,634	21,212
2020/2019	12,502	16,338
2019/2018	10,111	14,300
2018/2017	15,989	7,219
Prior	46,720	50,350
Revolving Loans	8,344	13,062
Total	118,825	146,684
Commercial [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	32	0
2020/2019	0	268
2019/2018	0	383
2018/2017	2	28
Prior	2,119	179
Revolving Loans	50	502
Total	2,203	1,360
Commercial [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	2,658	11,623
2021/2020	15,888	8,677
2020/2019	8,048	4,531
2019/2018	4,636	5,974
2018/2017	2,900	3,974
Prior	14,011	12,578
Revolving Loans	4,923	324
Total	53,064	47,681
Commercial [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	307	308
Revolving Loans	0	0
Total	307	308
Commercial [Member] | Hotel/Motel [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	62,047	51,290
2021/2020	37,963	25,252
2020/2019	23,411	62,526
2019/2018	61,339	30,887
2018/2017	30,403	36,518
Prior	65,793	50,589
Revolving Loans	0	0
Total	280,956	257,062
Commercial [Member] | Hotel/Motel [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	58,139	42,056
2021/2020	28,894	11,231
2020/2019	17,852	53,713
2019/2018	55,356	18,752
2018/2017	18,441	32,765
Prior	38,120	20,087
Revolving Loans	0	0
Total	216,802	178,604
Commercial [Member] | Hotel/Motel [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	3,908	9,234
2021/2020	9,069	14,021
2020/2019	5,559	8,813
2019/2018	5,983	8,780
2018/2017	11,962	2,678
Prior	25,670	30,502
Revolving Loans	0	0
Total	62,151	74,028
Commercial [Member] | Hotel/Motel [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	2,003	0
Revolving Loans	0	0
Total	2,003	0
Commercial [Member] | Hotel/Motel [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	3,355
2018/2017	0	1,075
Prior	0	0
Revolving Loans	0	0
Total	0	4,430
Commercial [Member] | Hotel/Motel [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	72,130	149,829
2021/2020	132,279	58,729
2020/2019	47,452	24,902
2019/2018	18,370	23,780
2018/2017	17,283	13,085
Prior	56,001	55,208
Revolving Loans	11,153	9,700
Total	354,668	335,233
Commercial [Member] | Commercial Real Estate Residential [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	68,934	142,364
2021/2020	127,149	54,380
2020/2019	42,594	22,320
2019/2018	16,652	19,826
2018/2017	13,499	11,919
Prior	45,711	45,791
Revolving Loans	10,884	9,544
Total	325,423	306,144
Commercial [Member] | Commercial Real Estate Residential [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	2,881	2,643
2021/2020	663	2,359
2020/2019	3,025	1,962
2019/2018	1,344	2,119
2018/2017	2,123	554
Prior	7,820	6,949
Revolving Loans	45	156
Total	17,901	16,742
Commercial [Member] | Commercial Real Estate Residential [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	16
Prior	15	0
Revolving Loans	0	0
Total	15	16
Commercial [Member] | Commercial Real Estate Residential [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	315	4,822
2021/2020	4,467	1,990
2020/2019	1,833	620
2019/2018	374	1,835
2018/2017	1,661	596
Prior	2,455	2,468
Revolving Loans	224	0
Total	11,329	12,331
Commercial [Member] | Commercial Real Estate Residential [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	88,477	224,894
2021/2020	219,221	107,094
2020/2019	100,727	90,131
2019/2018	83,890	60,799
2018/2017	49,555	61,093
Prior	191,561	190,506
Revolving Loans	24,796	23,376
Total	758,227	757,893
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	84,474	214,563
2021/2020	210,069	99,131
2020/2019	92,399	82,386
2019/2018	78,345	57,397
2018/2017	46,995	55,422
Prior	168,186	168,533
Revolving Loans	23,741	22,389
Total	704,209	699,821
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	2,618	5,130
2021/2020	4,361	2,865
2020/2019	3,304	3,981
2019/2018	2,451	2,802
2018/2017	1,542	3,655
Prior	12,155	11,828
Revolving Loans	1,010	767
Total	27,441	31,028
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	101	178
Revolving Loans	20	20
Total	121	198
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	1,385	5,201
2021/2020	4,791	5,098
2020/2019	5,024	3,764
2019/2018	3,094	600
2018/2017	1,018	2,016
Prior	10,812	9,659
Revolving Loans	25	200
Total	26,149	26,538
Commercial [Member] | Commercial Real Estate Nonresidential [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	307	308
Revolving Loans	0	0
Total	307	308
Commercial [Member] | Dealer Floorplans [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	71,785	69,452
Total	71,785	69,452
Commercial [Member] | Dealer Floorplans [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	71,398	69,105
Total	71,398	69,105
Commercial [Member] | Dealer Floorplans [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	387	347
Total	387	347
Commercial [Member] | Dealer Floorplans [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Commercial [Member] | Commercial Other [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	52,458	81,446
2021/2020	70,787	47,394
2020/2019	39,933	18,492
2019/2018	12,991	31,024
2018/2017	28,964	9,736
Prior	28,816	14,869
Revolving Loans	90,142	87,517
Total	324,091	290,478
Commercial [Member] | Commercial Other [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	50,382	72,650
2021/2020	63,584	43,838
2020/2019	38,128	16,495
2019/2018	11,490	29,858
2018/2017	28,379	9,105
Prior	26,997	13,346
Revolving Loans	78,536	75,119
Total	297,496	260,411
Commercial [Member] | Commercial Other [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	1,118	7,196
2021/2020	541	1,967
2020/2019	614	1,582
2019/2018	333	599
2018/2017	362	332
Prior	1,075	1,071
Revolving Loans	6,902	11,792
Total	10,945	24,539
Commercial [Member] | Commercial Other [Member] | OAEM [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	32	0
2020/2019	0	268
2019/2018	0	383
2018/2017	2	12
Prior	0	1
Revolving Loans	30	482
Total	64	1,146
Commercial [Member] | Commercial Other [Member] | Substandard [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	958	1,600
2021/2020	6,630	1,589
2020/2019	1,191	147
2019/2018	1,168	184
2018/2017	221	287
Prior	744	451
Revolving Loans	4,674	124
Total	15,586	4,382
Commercial [Member] | Commercial Other [Member] | Doubtful [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	0	46,227
2021/2020	7,785	1,108
2020/2019	3	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	0	0
Total	7,788	47,335
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | Pass [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	46,227
2021/2020	7,785	1,108
2020/2019	3	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	0	0
Total	7,788	47,335
Commercial [Member] | Commercial Unsecured SBA PPP [Member] | Watch [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	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]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	0	0
Revolving Loans	0	0
Total	0	0
Residential [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	94,529	195,731
2021/2020	190,337	161,534
2020/2019	142,722	76,216
2019/2018	66,822	37,552
2018/2017	33,042	43,155
Prior	278,252	264,426
Revolving Loans	98,373	95,238
Total	904,077	873,852
Residential [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	94,529	195,731
2021/2020	190,170	161,471
2020/2019	142,645	75,792
2019/2018	66,499	37,188
2018/2017	32,630	42,597
Prior	271,249	256,575
Revolving Loans	98,029	94,666
Total	895,751	864,020
Residential [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	167	63
2020/2019	77	424
2019/2018	323	364
2018/2017	412	558
Prior	7,003	7,851
Revolving Loans	344	572
Total	8,326	9,832
Residential [Member] | Real Estate Mortgage [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	94,529	195,731
2021/2020	190,337	161,534
2020/2019	142,722	76,216
2019/2018	66,822	37,552
2018/2017	33,042	43,155
Prior	265,797	252,997
Revolving Loans	0	0
Total	793,249	767,185
Residential [Member] | Real Estate Mortgage [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	94,529	195,731
2021/2020	190,170	161,471
2020/2019	142,645	75,792
2019/2018	66,499	37,188
2018/2017	32,630	42,597
Prior	259,263	245,666
Revolving Loans	0	0
Total	785,736	758,445
Residential [Member] | Real Estate Mortgage [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	167	63
2020/2019	77	424
2019/2018	323	364
2018/2017	412	558
Prior	6,534	7,331
Revolving Loans	0	0
Total	7,513	8,740
Residential [Member] | Home Equity Lines [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	12,455	11,429
Revolving Loans	98,373	95,238
Total	110,828	106,667
Residential [Member] | Home Equity Lines [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	11,986	10,909
Revolving Loans	98,029	94,666
Total	110,015	105,575
Residential [Member] | Home Equity Lines [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	0
2021/2020	0	0
2020/2019	0	0
2019/2018	0	0
2018/2017	0	0
Prior	469	520
Revolving Loans	344	572
Total	813	1,092
Consumer [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	261,905	334,777
2021/2020	262,373	229,596
2020/2019	179,223	99,308
2019/2018	75,330	64,939
2018/2017	46,657	27,965
Prior	31,363	20,923
Revolving Loans	0	0
Total	856,851	777,508
Consumer [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	261,876	334,753
2021/2020	262,254	229,457
2020/2019	179,187	99,285
2019/2018	75,274	64,905
2018/2017	46,646	27,939
Prior	31,348	20,919
Revolving Loans	0	0
Total	856,585	777,258
Consumer [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	29	24
2021/2020	119	139
2020/2019	36	23
2019/2018	56	34
2018/2017	11	26
Prior	15	4
Revolving Loans	0	0
Total	266	250
Consumer [Member] | Consumer Direct [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	38,195	71,626
2021/2020	54,693	39,316
2020/2019	30,694	18,495
2019/2018	14,493	10,502
2018/2017	8,251	4,493
Prior	13,465	12,251
Revolving Loans	0	0
Total	159,791	156,683
Consumer [Member] | Consumer Direct [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	38,166	71,626
2021/2020	54,692	39,312
2020/2019	30,692	18,492
2019/2018	14,493	10,468
2018/2017	8,251	4,490
Prior	13,465	12,251
Revolving Loans	0	0
Total	159,759	156,639
Consumer [Member] | Consumer Direct [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	29	0
2021/2020	1	4
2020/2019	2	3
2019/2018	0	34
2018/2017	0	3
Prior	0	0
Revolving Loans	0	0
Total	32	44
Consumer [Member] | Consumer Indirect [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	223,710	263,151
2021/2020	207,680	190,280
2020/2019	148,529	80,813
2019/2018	60,837	54,437
2018/2017	38,406	23,472
Prior	17,898	8,672
Revolving Loans	0	0
Total	697,060	620,825
Consumer [Member] | Consumer Indirect [Member] | Performing [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	223,710	263,127
2021/2020	207,562	190,145
2020/2019	148,495	80,793
2019/2018	60,781	54,437
2018/2017	38,395	23,449
Prior	17,883	8,668
Revolving Loans	0	0
Total	696,826	620,619
Consumer [Member] | Consumer Indirect [Member] | Nonperforming [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2022/2021	0	24
2021/2020	118	135
2020/2019	34	20
2019/2018	56	0
2018/2017	11	23
Prior	15	4
Revolving Loans	0	0
Total	$ 234	$ 206

X

- References

No definition available.

+ Details

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

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

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

X

- Definition

Amortized cost of financing receivable originated more than five years prior to current fiscal year. Excludes net investment in lease.

+ 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 https://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 https://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

Amortized cost of financing receivable originated four years prior to current fiscal year. Excludes net investment in lease.

+ 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 https://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
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