Quarterly report pursuant to Section 13 or 15(d)

BORROWINGS (Short-Term Borrowings) (Details)

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BORROWINGS (Short-Term Borrowings) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Short-term borrowings    
Securities sold under agreements to repurchase $ 39,434us-gaap_SecuritiesSoldUnderAgreementsToRepurchase $ 44,393us-gaap_SecuritiesSoldUnderAgreementsToRepurchase
Other short-term borrowings 335,000us-gaap_OtherShortTermBorrowings 343,000us-gaap_OtherShortTermBorrowings
Total short-term borrowings 374,434us-gaap_ShortTermBorrowings 387,393us-gaap_ShortTermBorrowings
Maximum month-end outstanding balance 374,434us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount 387,393us-gaap_ShorttermDebtMaximumMonthendOutstandingAmount
Average outstanding balance during the period 379,604us-gaap_ShorttermDebtAverageOutstandingAmount 237,896us-gaap_ShorttermDebtAverageOutstandingAmount
Average interest rate during the period 0.27%us-gaap_DebtInstrumentInterestRateDuringPeriod 0.24%us-gaap_DebtInstrumentInterestRateDuringPeriod
Average interest rate at end of period 0.26%us-gaap_DebtInstrumentInterestRateEffectivePercentage 0.31%us-gaap_DebtInstrumentInterestRateEffectivePercentage
Other short-term borrowings:    
Federal Funds purchased      
FHLB 325,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate 335,000us-gaap_FederalHomeLoanBankAdvancesMaturitiesSummaryDueWithinOneYearOfBalanceSheetDate
Other lines of credit $ 10,000ubsh_ShortTermBorrowingsFromOtherLinesOfCredit $ 8,000ubsh_ShortTermBorrowingsFromOtherLinesOfCredit