The 1911 Thames National Bank building is at 16-20 Chelsea Harbor Drive (formerly Shetucket Street) in downtown Norwich. As described in A Modern History of New London County, Connecticut, Volume 2 (1922):
The Thames Bank was the second institution of the kind chartered in Norwich, with a capital of $200,000, in 1825. By its charter the bank was obliged to purchase the stock of the Norwich Channel Company, and “maintain a depth of at least ten feet of water in the channel of the Thames river at common and ordinary tides.” The charter also permitted the bank to collect toll from all vessels coming to Norwich. These provisions of the charter were complied with so long as the bank operated under its State charter. The bank was also obliged to receive deposits from the State school fund, ecclesiastical societies, colleges and schools, at par, and pay on such deposits such dividends as were paid to their stockholders. The first bank rooms were on Main street
[…] Prosperity made it necessary to add to the facilities of the bank in order to properly meet the demands of increasing business, and in 1862 the bank erected enlarged quarters on Shetucket street. In 1864 the Thames Bank was succeeded by the Thames National Bank […] Its National Bank charter was renewed in 1884 and again in 1904, the home of the bank centering in the same quarters on Shetucket street until 1911, when the present building begun in 1910 was finished and occupied.
