Predictably enough, people have coined the word "matriotism" to describe love of the mother country. Whilst not in any dictionary, as far as I know, it's probably only a matter of time. Try typing matriotism into your favourite search engine. Here are a couple of samples:

http://hpk.felk.cvut.cz/tis/Voc/208.html

http://www.columbia.edu/~jbs39/words.html

Seems it appears in Catch-22 as well.