v3.26.1
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Mar. 31, 2026
Jun. 18, 2026
Sep. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Mar. 31, 2026    
Document Fiscal Year Focus 2026    
Document Fiscal Period Focus FY    
Title of 12(b) Security Common Stock, par value $0.01 share    
Security Exchange Name NASDAQ    
Trading Symbol CPBI    
Entity Registrant Name Central Plains Bancshares, Inc.    
Entity Central Index Key 0001979332    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Current Fiscal Year End Date --03-31    
Entity Filer Category Non-accelerated Filer    
Entity Shell Company false    
Entity Small Business true    
Entity Emerging Growth Company true    
Entity Ex Transition Period false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Public Float     $ 57.0
Entity Common Stock, Shares Outstanding   4,182,777  
Entity File Number 001-41844    
Entity Incorporation, State or Country Code MD    
Entity Tax Identification Number 93-2239246    
Entity Address, Address Line One 221 South Locust Street    
Entity Address, City or Town Grand Island    
Entity Address, State or Province NE    
Entity Address, Postal Zip Code 68801    
City Area Code 308    
Local Phone Number 382-4000    
Document Annual Report true    
Document Transition Report false    
Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the Proxy Statement for the 2026 Annual Meeting of Stockholders are incorporated by reference in Part III of this Form 10-K.

    
Auditor Name Plante & Moran, PLLC    
Auditor Location Chicago, Illinois    
Auditor Firm ID 166