Step 1: Historical dates.
- Punjab National Bank: Established in 1894.
- Bank of India: Established in 1906.
- Indian Bank: Established in 1907.
- Central Bank of India: Established in 1911.
Step 2: Analysis.
Punjab National Bank is the earliest among these.
Step 3: Conclusion.
Thus, the first bank established is Punjab National Bank (1894).