After the demolition of the existing structures on the site, which included the offices of the Water Works Company and of another bank, the cornerstone was laid on May 12, 1896.
The building was of Neoclassical design, with a colonnaded main entrance and a large circular stained glass sky light in the banking lobby.
In 1935, a two-story addition was erected to the south of the bank on Pennsylvania Street, replacing the original Scottish Rite Cathedral in Indianapolis.
After that date, Indiana allowed very limited branching but allowed the purchase of banks by holding companies anywhere in the state as long as total deposits that were controlled by the holding company did not exceed a ceiling that was initially set at 11 percent of all deposits held in Indiana banks.
[23][24] By late 1987, Indiana National wanted to expand into Monroe County, but was unable to find a local bank that it could purchase.
[25] In November 1988, Indiana National Corporation announced that it planned to open three branch offices in Bloomington in early 1989.
[31][32] In September 1989, INB Financial Corporation announced the pending acquisition of the Chesterton-based CSB Inc. with its Chesterton State Bank subsidiary for $18.2 million.
[37] In February 1990, INB Financial Corporation announced the pending acquisition of the Evansville-based Peoples Savings Bank of Evansville for an undisclosed amount.
[40] The acquisition was completed in January 1991 and Farmers Loan and Trust was renamed the INB Banking Company, Northeast.
[41][42] In August 1990, INB Financial Corporation announced the pending acquisition of the Salem-based Homestate Bancorp with its State Bank of Salem subsidiary for $6.1 million in cash.