Disclosures About Fair Value of Financial Instruments (Details Textual) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Disclosures About Fair Value of Financial Instruments (Textual) [Abstract]
Specific reserves related to impaired loans	$ 5,184	$ 5,676
Interest only strip security	$ 2,632	$ 2,894

Specific reserves related to impaired loans whose fair value is determined on a nonrecurring basis.

No definition available.

Name:	cuuu_SpecificReservesRelatedToImpairedLoans
Namespace Prefix:	cuuu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant