Dear Mr. Schnur,
Thank you for posting your request on History Hub!
We searched the National Archives Catalog and located a series Records Concerning Posts, Camps, and Stations, 1945 - 1954 (Record Group 338) that includes records of Camp Crowder but were able to find records pertaining to a camp bank or other financial institution on base. If he was saving money from his soldier pay, we suggest you contact the Defense Finance & Accounting Services (DFAS-Indianapolis) for information about pay for Army personnel via their website at https://www.dfas.mil/.
Also, we suggest that you contact the curator of The Longwell Museum at Crowder College that has a collection of photographs and records about Camp Crowder. The website is http://www.longwellmuseum.com/camp-crowder.html.
We hope this is helpful.