Why are banks changing their names?

ANDERSON BROS Bank 5 BANC OF CA 10 Bank of York 8 Community State Bank 1 ESB Financial 18 First Bank of Central Ohio 2 FIRST HORIZON Bank 11 First National Bank of Mt. Dora 3 FIRST SECURITY Bank 4 First Security State Bank 4 FIRST State Bank OF LIVINGSTON 14 Integrity Bank 5 Jersey State Bank 8 Nantahala Bank & Trust Company 6 National Bank & Trust 1 Peoples Exchange Bank 10 State Nebraska Bank & Trust 3 Todays Bank 13 TS Bank 11 UNITY Bank 18