In 1852, Rockwood, Hazard & Company purchased, from the Lehigh Coal and Navigation Company, a stone building erected in 1829 on the site of the present Broadway structure of the JTNB. This was the beginning of a private bank known as the "Savings Shoppe".

The directors of the Savings Shoppe organized the first chartered bank in Carbon County in 1855 known as the Mauch Chunk Bank. The newly formed bank occupied the same building which formerly housed the Savings Shoppe.

In 1863, The First National Bank of Mauch Chunk was organized, erecting a new building on the site of the former Mauch Chunk Bank.

After four decades as a prosperous bank in a small Victorian town known for its railroad industry and neighboring coal mines, The First National Bank of Mauch Chunk consolidated with the Linderman National Bank in 1902 and was chartered by the United States Treasury Department as The Mauch Chunk National Bank.

In 1955, a year after the merger of the neighboring towns of Mauch Chunk and East Mauch Chunk and renaming the towns as Jim Thorpe, Pennsylvania , the Citizens National Bank of East Mauch Chunk and the Mauch Chunk National Bank consolidated and formed The Jim Thorpe National Bank. In 1988, The Jim Thorpe National Bank became a subsidiary company of the newly incorporated JTNB Bancorp, Inc.

Today, JTNB has four branch offices: the Main Banking House at 12 Broadway, Jim Thorpe, the East Side Branch at 418 Center Street , Jim Thorpe (the site of the former Citizens National Bank of East Mauch Chunk), the Penn Forest Branch at 1397 State Route 903, Jim Thorpe, and the Lehighton Branch at 145 South Fourth Street , Lehighton.

JTNB continues to prosper and prides itself on its personal banking services. JTNB has remained a true community bank.