Exhibit 16.1 [Letterhead of Deloitte & Touche LLP] September 26, 1996 Securities and Exchange Commission Mail Stop 9-5 450-5th Street, N.W. Washington, D.C. 20549 Dear Sirs/Madams: We have read and agree with the comments in Item 4 of Form 8-K of Napa National Bancorp dated September 25, 1996, except that we are not able to comment on the registrant's response required by regulation SK paragraph 304(a)2. Yours truly, /s/ DELOITTE & TOUCHE LLP