The Federal Deposit Insurance Corporation, or FDIC, released its quarterly banking profile for the fourth quarter, and in this video, Motley Fool financial analysts David Hanson and Matt Koppenheffer discuss two of the most important takeaways across the banking sector for investors to note from the report. David and Matt discuss why banking margins continue to suffer in this climate, why non-interest income for banks continues to be so important to banking revenue right now, and which banks are able to keep non-interest income high.