The financial institution withinside the starting desired the function of a local financial institution and slowly however gradually constructed for itself an area withinside the Delta District Thanjavur. The first Branch of the Bank turned into opened at Mannargudi on twenty fourth January 1930.  Thereafter, branches had been opened at Nagapattinam, Sannanallur, Ayyampet, Tirukattupalli, Tiruvarur, Manapparai, Mayuram and Porayar inside a span of twenty 5 years.  The Bank turned into covered withinside the Second Schedule of Reserve Bank of India Act, 1934, on twenty second March 1945. 
 
The Bank celebrated its Golden Jubilee on 14th November, 1954 at Kumbakonam beneathneath the Presidentship of Shri.C.R.Srinivasan, Editor, `Swadesmitran' & Director, Reserve Bank of India.  
 
In 1957, the financial institution took over the belongings and liabilities of the Common Wealth Bank Limited and withinside the technique annexed to it the 5 Branches of Common Wealth Bank Limited at Aduthurai, Kodavasal, Valangaiman, Jayankondacholopuram and Ariyalur. 
 
In 1963,  Shri. R. A.Venkataramani Iyer took fee because the Chairman of the Bank which function he held as much as 1969. 
 
In April, 1965,  different neighborhood banks viz., 'The City Forward Bank Limited' and 'The Union Bank Limited' had been amalgamated with the Bank beneathneath a scheme of amalgamation with the consequent addition of six extra branches viz., Kumbakonam-Town, Nannilam, Koradacherry, Tiruvidaimarudur, Tirupanandal and Kuttalam. Consequently, the Bank's call turned into modified to 'The Kumbakonam City Union Bank Limited'. 
 
In November 1965, the financial institution's first department at Madras turned into opened at Thiyagaraya Nagar. In May, 1969 the Bank secured the offerings of Shri. O.R. Srinivasan, a former Officer   of Reserve Bank of India to be on the helm of affairs as Chairman and Chief Executive Officer which occasion proved to be a turning factor withinside the annals of the Bank. Under the brand new Management the Branch Expansion were given a sparkling impetus and branches had been opened at Eravancheri, Sembanarkoil, Tiruchirapalli, Madurai, Thanjavur, Dindigul, Keelapalur, Tirumakkottai, Kottur, Tiruvarur Town and Coimbatore all through the length from March, 1968 to August, 1973. 
 
In April, 1974 the financial institution secured the offerings of Shri. K.Srinivasan, another  former Senior Officer of Reserve Bank of India, as its Secretary.  At that time, a Young Chartered Accountant from Thippirajapuram village close to Kumbakonam,   Shri. V.Narayanan turned into appointed as Assistant Secretary of the Bank. 
 
During the length 1974-1976 Branches had been opened at Periyakulam, Mandaveli (Madras), Pattukkottai, Triplicane (Madras), Cuddalore, Pudukkottai, Chidambaram and Salem. 
 
When Shri. O.R.Srinivasan relinquished his workplace in June 1977, the then Secretary Shri. K.Srinivasan turned into appointed as Chairman and Chief Executive Officer of the Bank and the then Asst.Secretary Shri. V.Narayanan turned into multiplied to the rank of the Secretary. 
 
From July,1977 to September,1979 the financial institution has opened ten extra branches along with the ones at George Town (Madras), Mount Road (Madras), Tirunelveli and Karaikudi.