Business of Wilshire Bancorp, Inc. (Details)	3 Months Ended
Mar. 31, 2014 Item
Business of Wilshire Bancorp, Inc.
Number of full-service branch offices in Southern California, Texas, New Jersey, and the greater New York City metropolitan area	35
Business of wilshire bancorp, Inc
Number of loan production offices utilized primarily for origination of loans under SBA lending program	7

Represents the number of loan production offices utilized primarily for the origination of loans under the entity's Small Business Administration (SBA) lending program.

No definition available.

Name:	wibc_NumberOfLoanProductionOfficesUsedForSmallBusinessAdministrationLendingProgram
Namespace Prefix:	wibc_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration