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Westamerica Bank, History
The following are major historical events for Westamerica Bank, including mergers and acquisitions.
| 1884-02-24 | Institution established: Original name:The First National Bank of Cloverdale | |
| 1980-02-04 | Changed name to The First National Bank of Mendocino County | |
| 1980-02-11 | Moved bank headquarters from CLOVERDALE, CA to UKIAH, CA | |
| 1983-07-01 | Moved bank headquarters from UKIAH, CA to SAN RAFAEL, CA | |
| 1983-07-01 | Acquired Bank of Marin (18617) in SAN RAFAEL, CA | |
| 1983-07-01 | Acquired Gold Country Bank (21835) in GRASS VALLEY, CA | |
| 1983-07-01 | Changed name to Westamerica Bank, National Association | |
| 1983-07-01 | Acquired Vaca Valley Bank (17528) in VACAVILLE, CA | |
| 1983-07-01 | Acquired Bank of Sonoma County (1302) in SANTA ROSA, CA | |
| 1983-07-01 | Acquired Bank of Lake County (8010) in LAKEPORT, CA | |
| 1985-10-31 | Acquired Westamerica Trust Company (90549) in SAN RAFAEL, CA | |
| 1992-02-28 | Acquired John Muir National Bank (25912) in MARTINEZ, CA | |
| 1993-05-21 | Acquired Suisun Valley Bank (23302) in FAIRFIELD, CA | |
| 1993-08-31 | Changed primary regulatory agency from COMPTROLLER OF THE CURRENCY to FEDERAL RESERVE BOARD | |
| 1993-08-31 | Changed name to Westamerica Bank | |
| 1995-02-24 | Acquired Pacific Valley National Bank (24183) in MODESTO, CA | |
| 1995-06-10 | Acquired CapitolBank Sacramento (22260) in SACRAMENTO, CA | |
| 1995-09-16 | Acquired Novato National Bank (26234) in NOVATO, CA | |
| 1996-04-12 | Acquired Napa Valley Bank (20432) in NAPA, CA | |
| 1997-06-21 | Acquired ValliWide Bank (21166) in FRESNO, CA | |
| 2000-08-19 | Acquired Bank of Lake County (27320) in LAKEPORT, CA | |
| 2000-09-16 | Acquired First Counties Bank (26250) in CLEARLAKE, CA | |
| 2002-06-21 | Acquired Kerman State Bank (24228) in KERMAN, CA | |
| 2005-03-12 | Acquired National Bank of the Redwoods (25910) in SANTA ROSA, CA | |
| 2008-01-14 | Changed institution class to INSURED COMMERCIAL BANKS, STATE, NOT MEMBERS OF THE FRS | |
| 2008-01-14 | Changed primary regulatory agency from FEDERAL RESERVE BOARD to FEDERAL DEPOSIT INSURANCE CORPORATION | |
| 2009-02-06 | Acquired County Bank (22574) in MERCED, CA as part of a government assisted transaction. | |
| 2010-08-20 | Acquired Sonoma Valley Bank (27259) in SONOMA, CA as part of a government assisted transaction. | |
| 2011-05-27 | Changed institution class to INSURED COMMERCIAL OR SAVINGS BANKS, STATE, MEMBERS FRS | |
| 2011-05-27 | Changed primary regulatory agency from FEDERAL DEPOSIT INSURANCE CORPORATION to FEDERAL RESERVE BOARD |