First National Bank of San Diego County
| Status: | Inactive as of 03/06/1981 |
| Merger - Without Assistance | |
| Successor Bank: | The Mitsubishi Bank of California |
| Headquarters: | First National Bank of San Diego County 140 North Escondido Boulevard Escondido, CA 92025 |
| Established: | 12/21/1964 |
| FDIC Insurance: | 12/21/1964 |
| FDIC Cert: | #19325 |
| Charter Class: | Commercial bank, national (federal) charter and Fed member, supervised by the Office of the Comptroller of the Currency (OCC) |
History
| 1964-12-21 | Institution established: Original name:Escondido National Bank | |
| 1976-08-01 | Changed name to First National Bank of San Diego County | |
| 1977-12-31 | Acquired Balboa Bank (20716) in CHULA VISTA, CA | |
| 1981-03-06 | Merged into and subsequently operated as part of The Mitsubishi Bank of California (20598) in LOS ANGELES, CA | |
| 1988-07-29 | Merged into and subsequently operated as part of The Bank of California, National Association (22826) in SAN FRANCISCO, CA | |
| 1996-04-01 | Changed name to Union Bank of California, National Association (22826) | |
| 1996-04-01 | Acquired Union Bank (17186) in SAN FRANCISCO, CA | |
| 2002-05-13 | Acquired First Western Bank (23357) in SIMI VALLEY, CA | |
| 2002-10-31 | Acquired Valencia Bank & Trust (27091) in SANTA CLARITA, CA | |
| 2002-12-31 | Acquired COPPER MOUNTAIN TRUST CORPORATION (91103) in PORTLAND, OR | |
| 2003-07-01 | Reorganized. | |
| 2003-07-01 | Acquired Monterey Bay Bank (28271) in WATSONVILLE, CA | |
| 2004-01-16 | Acquired Business Bank of California (25070) in SAN BERNARDINO, CA | |
| 2004-10-28 | Acquired Jackson Federal Bank (28653) in FULLERTON, CA | |
| 2008-12-18 | Changed name to Union Bank, National Association (22826) | |
| 2009-09-24 | Acquired Texas First Bank - Winnie (18046) in DALLAS, TX | |
| 2010-04-16 | Acquired Tamalpais Bank (33493) in SAN RAFAEL, CA as part of a government assisted transaction. | |
| 2010-04-30 | Acquired Frontier Bank (22710) in EVERETT, WA as part of a government assisted transaction. | |
| 2012-12-03 | Acquired Santa Barbara Bank & Trust, National Association (18169) in SANTA BARBARA, CA | |
| 2014-07-01 | Changed name to MUFG Union Bank, National Association (22826) |