FINANCIAL INSTRUMENTS WITH OFF-BALANCE-SHEET RISK (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instrument expiration period	30 days
Investment of UBT to limited partnership	$ 920,000	$ 900,000
Obligation of UBT to the limited partnership	260,000	457,000
Percentage investment in limited partnership (in hundredths)	99.00%
Maximum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instrument, interest rate (in hundredths)	5.75%
Minimum [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instrument expiration period	90 days
Financial instrument, interest rate (in hundredths)	2.625%
Commitments to make loans [Member] | Variable Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	8,690,000	21,309,000
Commitments to make loans [Member] | Fixed Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	5,780,000	7,017,000
Unused lines of credit [Member] | Variable Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	101,997,000	96,948,000
Unused lines of credit [Member] | Fixed Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	12,544,000	4,116,000
Standby letters of credit [Member] | Variable Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	9,160,000	10,262,000
Standby letters of credit [Member] | Fixed Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Financial instruments with off-balance sheet risk	$ 0	$ 0