Annual report pursuant to Section 13 and 15(d)

REGULATORY MATTERS AND CAPITAL (Schedule of Bank Capital and Ratio) (Details)

v2.4.1.9
REGULATORY MATTERS AND CAPITAL (Schedule of Bank Capital and Ratio) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, actual amount $ 771,441us-gaap_Capital $ 465,360us-gaap_Capital
Total capital to risk weighted assets, actual ratio 13.40%us-gaap_CapitalToRiskWeightedAssets 14.17%us-gaap_CapitalToRiskWeightedAssets
Total capital to risk weighted assets, Required for Capital adequacy purposes, amount 460,562us-gaap_CapitalRequiredForCapitalAdequacy 262,730us-gaap_CapitalRequiredForCapitalAdequacy
Total capital to risk weighted assets, required for capital adequacy purposes, ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 capital to risk weighted assets, actual amount 735,611us-gaap_TierOneRiskBasedCapital 428,490us-gaap_TierOneRiskBasedCapital
Tier 1 capital to risk weighted assets, actual ratio 12.77%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets 13.05%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
Tier 1 capital to risk weighted assets, required for capital adequacy purposes, amount 230,418us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy 131,338us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
Tier 1 capital ratio of risk-weighted assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
Tier 1 capital to average adjusted assets, actual amount 735,611us-gaap_TierOneLeverageCapital 428,490us-gaap_TierOneLeverageCapital
Tier 1 capital to average adjusted assets, actual ratio 10.63%us-gaap_TierOneLeverageCapitalToAverageAssets 10.70%us-gaap_TierOneLeverageCapitalToAverageAssets
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, amount 276,806us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy 160,183us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
Union Bank & Trust [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets, actual amount 745,125us-gaap_Capital
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		442,784us-gaap_Capital
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Total capital to risk weighted assets, actual ratio 13.00%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		13.56%us-gaap_CapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Total capital to risk weighted assets, Required for Capital adequacy purposes, amount 458,538us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		261,229us-gaap_CapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Total capital to risk weighted assets, required for capital adequacy purposes, ratio 8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		8.00%us-gaap_CapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Total capital to risk weighted assets, required in order to be well capitalized under PCA, amount 573,173us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		326,537us-gaap_CapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Total capital to risk weighted assets, required in order to be well capitalized under PCA, ratio 10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		10.00%us-gaap_CapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to risk weighted assets, actual amount 709,309us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		405,925us-gaap_TierOneRiskBasedCapital
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to risk weighted assets, actual ratio 12.37%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		12.43%us-gaap_TierOneRiskBasedCapitalToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to risk weighted assets, required for capital adequacy purposes, amount 229,364us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		130,628us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital ratio of risk-weighted assets 4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		4.00%us-gaap_TierOneRiskBasedCapitalRequiredForCapitalAdequacyToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to risk weighted assets, required in order to be well capitalized under PCA, amount 344,046us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		195,941us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to risk weighted assets, required in order to be well capitalized under PCA, ratio 6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		6.00%us-gaap_TierOneRiskBasedCapitalRequiredToBeWellCapitalizedToRiskWeightedAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to average adjusted assets, actual amount 709,309us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		405,925us-gaap_TierOneLeverageCapital
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to average adjusted assets, actual ratio 10.30%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		10.19%us-gaap_TierOneLeverageCapitalToAverageAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, amount 275,460us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		159,342us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacy
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to average adjusted assets, required for capital adequacy purposes, ratio 4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		4.00%us-gaap_TierOneLeverageCapitalRequiredForCapitalAdequacyToAverageAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to average adjusted assets, required in order to be well capitalized under PCA, amount $ 344,325us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		$ 199,178us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalized
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember
Tier 1 capital to average adjusted assets, required in order to be well capitalized under PCA, ratio 5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember 		5.00%us-gaap_TierOneLeverageCapitalRequiredToBeWellCapitalizedToAverageAssets
/ dei_LegalEntityAxis
= ubsh_UnionBankTrustMember