INVESTMENT SECURITIES (Details 3) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013
October 1, 2013 through June 30, 2014	$ 25
2015	117
2016	56
2017	61
2018	65
2018 and thereafter	69
Expected Return Held To Maturity For Year Total	$ 393

Expected return on a investment classified as Held to maturity after five years.

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityAfterYearFive
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Expected return on an investment classified as held to maturity for fifth year.

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityForYearFive
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Expected return on a investment classified as Held to maturity for fourth year

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityForYearFour
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Expected return on a investment classified as Held to maturity for third.

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityForYearThree
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Expected return on a investment classified as Held to maturity for total.

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityForYearTotal
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Expected return on a investment classified as Held to maturity for Second year.

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityForYearTwo
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of an expected return held to maturity for an investment maturing in the next fiscal year following the latest fiscal year.

No definition available.

Name:	ucba_ExpectedReturnHeldToMaturityInNextTwelveMonths
Namespace Prefix:	ucba_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant