CHICAGO, Dec 4 (Reuters) - Spot basis bids for soybeans and corn were mostly steady to higher on Wednesday in the U.S. Midwest as farmer selling remained slow, grain dealers said.

* The soybean basis jumped by 15 cents a bushel at a river terminal in Savanna, Illinois, and by 5 cents at a Decatur, Indiana processor.

* Soybean crush margins have declined since early November but remain profitable, supporting processor demand.

* Chicago Board of Trade January soybean futures SF25 were down 6-3/4 cents at $9.85 per bushel by 11:50 a.m. CST (1750 GMT). CBOT March corn futures CH25 slipped 2 cents to $4.30-1/4 a bushel. GRA/

Basis values are quoted against CBOT futures in cts/bu:

NOTE: 0 = Option price, UNC = Unchanged, UNQ = Unquoted

NC = Not comparable, DP = Delayed price, N/A = Not available,

F = January, H = March, K = May, N = JulyQ = August, U = September, X = November, Z = December

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LINKS: 0#USCSHGRN-PM

For U.S. forward basis spreadsheets, please click:

CORN/BASIS, SOYA/BASIS, WHEAT/BASIS, MILO/BASIS

- CBOT corn report COR/

- CBOT soybean report SOY/C

- CBOT wheat report WHE/C

- U.S. grain barge freight values BG/US

- U.S. Midwest cash grain PM GRA/PM

- U.S. CIF/FOB Gulf Grain GRA/F

(Reporting by Tom Polansek in Chicago; Editing by Vijay Kishore)

((Thomas.Polansek@thomsonreuters.com))