How do banks make a profit?

ALLIANCE Bank 13 BANESCO USA 19 Bank of Marion 4 Belt Valley Bank 5 CENTRAL State Bank 9 CLIMATE FIRST Bank 12 DBA FIRST CONVENIENCE Bank 16 ENDEAVOR Bank 9 Finance Factor 31 First National Bank in New Bremen 3 First State Bank of St. Charles, MO 5 HERITAGE Bank INC 4 Lineage Bank 10 Method Bank 10 Old Exchange National Bank 20 Solon State Bank 7 Texas Traditions Bank 5 TRUSTMARK Bank 18 Twin Valley Bank 3 Valley Bank of Kalispell 1