Dex-Hort-Bnk-'89-THEN-mr September 18, 2010 1500 × 894 Dex-Hort-Bnk-'89-THEN-mr THEN: After the city’s big fire of 1889, its first bank, Dexter Horton’s at First Avenue South and Washington Street, although gutted, was still secure in its back-wall vault -both used and guarded.