Key insight: Bank M&A was one of the hottest topics during the first week of earnings season.What's at stake: As consolidation accelerates, many banks are feeling pressure to get bigger or sell.Forward look: Home Bancshares in Arkansas and First Horizon Corp. in Tennessee both indicated interest in being buyers.Banks' credit quality has been under the microscope for the last week, as fraud scandals and a weakening labor market cast a shadow over what have been otherwise positive financial reports.Despite re ...