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Credit Quality - Schedule of Risk Category of Loans by Class of Loans and Leases (Detail) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
Total	$ 14,274,274	$ 11,881,005
Owner-Occupied [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	353,313
2024	362,444	236,794
2023	205,602	132,095
2022	304,730	246,596
2021	278,290	225,152
2020		205,768
Prior	578,800	504,586
Revolving loans amortized cost basis	62,626	38,890
Revolving loans converted to term loans	116	121
Total	2,145,921	1,590,002
Owner-Occupied [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	353,313
2024	362,198	236,547
2023	196,733	132,095
2022	301,328	243,103
2021	278,290	225,152
2020		205,461
Prior	555,204	467,417
Revolving loans amortized cost basis	51,711	29,900
Revolving loans converted to term loans	0	0
Total	2,098,777	1,539,675
Owner-Occupied [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	4,842	0
2022	0	0
2021	0	0
2020		0
Prior	3,727	15,199
Revolving loans amortized cost basis	2,695	8,545
Revolving loans converted to term loans	0	0
Total	11,264	23,744
Owner-Occupied [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	246	247
2023	4,027	0
2022	3,402	3,493
2021	0	0
2020		307
Prior	19,671	21,744
Revolving loans amortized cost basis	8,220	445
Revolving loans converted to term loans	116	121
Total	35,682	26,357
Owner-Occupied [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	198	226
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	198	226
Owner-Occupied [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	(228)	(116)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(228)	(116)
Owner-Occupied [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	14	15
2021	0	0
2020		0
Prior	304	1,168
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	318	1,183
Owner-Occupied [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	14	15
2021	0	0
2020		0
Prior	76	1,052
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	90	1,067
Nonowner-Occupied [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	1,630,768
2024	856,235	741,996
2023	772,532	485,437
2022	2,018,312	1,635,973
2021	1,284,331	1,380,492
2020		669,226
Prior	1,615,761	1,844,378
Revolving loans amortized cost basis	165,581	182,061
Revolving loans converted to term loans	0	78
Total	8,343,520	6,939,641
Nonowner-Occupied [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	1,628,785
2024	856,235	741,996
2023	760,043	485,437
2022	1,917,759	1,623,423
2021	1,165,300	1,294,232
2020		639,143
Prior	1,397,941	1,584,833
Revolving loans amortized cost basis	143,406	160,243
Revolving loans converted to term loans	0	78
Total	7,869,469	6,529,385
Nonowner-Occupied [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	1,983
2024	0	0
2023	7,058	0
2022	51,603	8,465
2021	113,708	82,240
2020		29,940
Prior	120,213	210,912
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	294,565	331,557
Nonowner-Occupied [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	5,431	0
2022	48,950	4,085
2021	5,323	4,020
2020		143
Prior	97,607	48,633
Revolving loans amortized cost basis	22,175	21,818
Revolving loans converted to term loans	0	0
Total	179,486	78,699
Nonowner-Occupied [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Nonowner-Occupied [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		(751)
Prior	(35,798)	(1,830)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(35,798)	(2,581)
Nonowner-Occupied [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	160	200
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	160	200
Nonowner-Occupied [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		(751)
Prior	(35,638)	(1,630)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(35,638)	(2,381)
Other Commercial Loans [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	628,602
2024	375,820	403,928
2023	475,304	506,402
2022	221,616	398,128
2021	332,478	401,780
2020		165,757
Prior	627,305	549,716
Revolving loans amortized cost basis	1,123,661	925,651
Revolving loans converted to term loans	47	0
Total	3,784,833	3,351,362
Other Commercial Loans [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	628,597
2024	373,700	403,641
2023	472,334	505,947
2022	214,442	378,072
2021	324,424	394,412
2020		164,671
Prior	600,824	519,488
Revolving loans amortized cost basis	1,117,879	912,293
Revolving loans converted to term loans	47	0
Total	3,732,247	3,278,524
Other Commercial Loans [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	5
2024	431	81
2023	117	36
2022	949	1,129
2021	1,128	339
2020		251
Prior	9,012	18,941
Revolving loans amortized cost basis	458	4,652
Revolving loans converted to term loans	0	0
Total	12,100	25,429
Other Commercial Loans [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	1,689	206
2023	2,853	419
2022	6,225	18,927
2021	6,926	7,029
2020		835
Prior	17,469	11,262
Revolving loans amortized cost basis	5,324	8,706
Revolving loans converted to term loans	0	0
Total	40,486	47,384
Other Commercial Loans [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	25
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	25
Other Commercial Loans [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	(48)	0
2023	(150)	(464)
2022	(229)	(252)
2021	(1,625)	(156)
2020		(148)
Prior	(2,459)	(1,352)
Revolving loans amortized cost basis	(913)	(1,217)
Revolving loans converted to term loans	0	0
Total	(5,424)	(3,589)
Other Commercial Loans [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	10
2023	27	67
2022	75	9
2021	32	45
2020		0
Prior	2,111	1,512
Revolving loans amortized cost basis	64	7
Revolving loans converted to term loans	0	0
Total	2,309	1,650
Other Commercial Loans [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	(48)	10
2023	(123)	(397)
2022	(154)	(243)
2021	(1,593)	(111)
2020		(148)
Prior	(348)	160
Revolving loans amortized cost basis	(849)	(1,210)
Revolving loans converted to term loans	0	0
Total	(3,115)	(1,939)
Residential Real Estate [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	746,665
2024	428,121	407,812
2023	785,205	820,166
2022	1,608,513	1,617,541
2021	830,732	827,903
2020		396,094
Prior	1,164,513	986,122
Revolving loans amortized cost basis	534,353	449,196
Revolving loans converted to term loans	160	2,550
Total	6,098,262	5,507,384
Residential Real Estate [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	746,665
2024	427,238	407,430
2023	784,994	820,059
2022	1,608,513	1,617,541
2021	822,932	827,395
2020		396,094
Prior	1,148,481	971,226
Revolving loans amortized cost basis	533,509	447,363
Revolving loans converted to term loans	160	2,467
Total	6,072,492	5,489,575
Residential Real Estate [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	476	382
2023	104	107
2022	0	0
2021	0	0
2020		0
Prior	4,048	2,466
Revolving loans amortized cost basis	637	1,326
Revolving loans converted to term loans	0	0
Total	5,265	4,281
Residential Real Estate [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	407	0
2023	107	0
2022	0	0
2021	7,800	508
2020		0
Prior	11,984	12,430
Revolving loans amortized cost basis	207	507
Revolving loans converted to term loans	0	83
Total	20,505	13,528
Residential Real Estate [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Residential Real Estate [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	(67)	0
2023	(205)	(7)
2022	(189)	(2)
2021	(6)	0
2020		0
Prior	(532)	(359)
Revolving loans amortized cost basis	0	(113)
Revolving loans converted to term loans	0	0
Total	(999)	(481)
Residential Real Estate [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	2	5
2020		0
Prior	701	489
Revolving loans amortized cost basis	1	1
Revolving loans converted to term loans	0	0
Total	704	495
Residential Real Estate [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	(67)	0
2023	(205)	(7)
2022	(189)	(2)
2021	(4)	5
2020		0
Prior	169	130
Revolving loans amortized cost basis	1	(112)
Revolving loans converted to term loans	0	0
Total	(295)	14
Construction & Land Development [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	1,031,756
2024	995,673	628,186
2023	728,729	837,662
2022	401,845	1,254,935
2021	69,668	445,218
2020		20,223
Prior	37,481	20,508
Revolving loans amortized cost basis	305,750	302,302
Revolving loans converted to term loans	0	0
Total	3,570,902	3,509,034
Construction & Land Development [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	1,031,215
2024	992,846	628,186
2023	693,752	837,662
2022	401,811	1,253,480
2021	65,460	426,662
2020		18,559
Prior	27,716	18,542
Revolving loans amortized cost basis	305,750	302,302
Revolving loans converted to term loans	0	0
Total	3,518,550	3,485,393
Construction & Land Development [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	2,827	0
2023	30,509	0
2022	0	1,455
2021	4,208	18,356
2020		57
Prior	8,281	153
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	45,825	20,021
Construction & Land Development [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	541
2024	0	0
2023	4,468	0
2022	34	0
2021	0	200
2020		1,607
Prior	1,484	1,813
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	6,527	3,620
Construction & Land Development [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Construction & Land Development [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	(141)	0
2022	0	0
2021	(103)	0
2020		0
Prior	(164)	(29)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(408)	(29)
Construction & Land Development [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	225	319
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	225	319
Construction & Land Development [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	(141)	0
2022	0	0
2021	(103)	0
2020		0
Prior	61	290
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(183)	290
Bankcard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	9,686	9,998
Revolving loans converted to term loans	0	0
Total	9,686	9,998
Bankcard [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	9,603	9,874
Revolving loans converted to term loans	0	0
Total	9,603	9,874
Bankcard [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	28	63
Revolving loans converted to term loans	0	0
Total	28	63
Bankcard [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	55	61
Revolving loans converted to term loans	0	0
Total	55	61
Bankcard [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Bankcard [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	(320)	(431)
Revolving loans converted to term loans	0	0
Total	(320)	(431)
Bankcard [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	55	19
Revolving loans converted to term loans	0	0
Total	55	19
Bankcard [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	(265)	(412)
Revolving loans converted to term loans	0	0
Total	(265)	(412)
Other Consumer [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	346,960
2024	91,126	140,479
2023	80,262	133,095
2022	164,578	291,957
2021	62,245	128,069
2020		52,615
Prior	20,201	24,614
Revolving loans amortized cost basis	2,124	2,248
Revolving loans converted to term loans	0	0
Total	767,496	773,077
Other Consumer [Member] | Pass [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	346,057
2024	90,623	139,908
2023	79,353	131,108
2022	157,220	276,041
2021	57,987	118,478
2020		49,553
Prior	18,929	22,913
Revolving loans amortized cost basis	2,104	2,215
Revolving loans converted to term loans	0	0
Total	752,273	740,216
Other Consumer [Member] | Special Mention [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	682
2024	446	495
2023	821	1,805
2022	6,741	13,462
2021	3,794	8,485
2020		2,704
Prior	1,171	1,440
Revolving loans amortized cost basis	13	23
Revolving loans converted to term loans	0	0
Total	13,668	28,414
Other Consumer [Member] | Substandard [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	221
2024	57	76
2023	88	182
2022	617	2,454
2021	464	1,106
2020		358
Prior	101	261
Revolving loans amortized cost basis	7	10
Revolving loans converted to term loans	0	0
Total	1,555	4,447
Other Consumer [Member] | Doubtful [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	0	0
2023	0	0
2022	0	0
2021	0	0
2020		0
Prior	0	0
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	0	0
Other Consumer [Member] | Current-period charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	(15)
2024	(185)	(28)
2023	(507)	(206)
2022	(4,547)	(5,724)
2021	(1,698)	(3,096)
2020		(869)
Prior	(783)	(380)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	(7,735)	(10,303)
Other Consumer [Member] | Current-period recoveries [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	0
2024	7	0
2023	78	21
2022	642	402
2021	273	241
2020		125
Prior	429	330
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	1,429	1,119
Other Consumer [Member] | Current-period net charge-offs [Member]
Disclosure Details Of Loans And Leases By Risk Category [Line Items]
2025	(15)
2024	(178)	(28)
2023	(429)	(185)
2022	(3,905)	(5,322)
2021	(1,425)	(2,855)
2020		(744)
Prior	(354)	(50)
Revolving loans amortized cost basis	0	0
Revolving loans converted to term loans	0	0
Total	$ (6,306)	$ (9,184)

X

- Definition

Disclosure Details Of Loans and Leases Outstanding Based On Risk Category [Line Items]

+ References

No definition available.

+ Details

Name:	ubsi_DisclosureDetailsOfLoansAndLeasesByRiskCategoryLineItems
Namespace Prefix:	ubsi_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The Gross carrying amount of Loans and Finance Receivables from various Credit transaction before Providing for Doubtful accounts.

+ References

No definition available.

+ Details

Name:	ubsi_LoansAndFinanceReceivablesGross
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Revolving Loans Convertedto Term Loans.

+ References

No definition available.

+ Details

Name:	ubsi_RevolvingLoansConvertedtoTermLoans
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Revolving loans on an amortized basis.

+ References

No definition available.

+ Details

Name:	ubsi_RevolvingloansAmortizedCostBasis
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term loans originated in year five.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearFive
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term Loans Origination Year Four.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearFour
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term loans originated in year one.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearOne
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term loans originated prior to year five.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearPrior
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term loans origination year six.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearSix
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term Loans Origination Year Three.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearThree
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Term loans originated in year two.

+ References

No definition available.

+ Details

Name:	ubsi_TermLoansOriginationYearTwo
Namespace Prefix:	ubsi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ubsi_OwnerOccupiedCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_PassMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SpecialMentionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_SubstandardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=us-gaap_DoubtfulMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=ubsi_CurrentPeriodChargeOffsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=ubsi_CurrentPeriodRecoveriesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_InternalCreditAssessmentAxis=ubsi_CurrentPeriodNetChargeOffsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ubsi_NonownerOccupiedCommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ubsi_OtherCommercialLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ResidentialPortfolioSegmentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=us-gaap_ConstructionLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ubsi_BankCardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancingReceivableRecordedInvestmentByClassOfFinancingReceivableAxis=ubsi_OtherConsumerMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: