Permanent TSB has launched a new archive, website and book, detailing the long 200-year history of the bank.
The resources pull together documents and other materials that together chart the evolution of the bank over the past two centuries.
Among the artefacts are minute books, ledgers, passbooks, corporate records and photographs dating from the early 1800s to the present day.
"The history of Permanent TSB is intertwined with Irish history and Irish society," the bank's chief executive Eamonn Crowley said.
"The communities that we served became generations of loyal customers and our branches and offices became part the fabric of towns and cities across Ireland," he stated.
Mr Crowley added that the archive is also an exercise in humility.
"200 years ago our forbearers helped ordinary people to manage their finances and to improve their local communities," he said.
"Financial services have become a lot more complex in the last two centuries and we have made mistakes along the way but the purpose of our business remains the same - working hard every day to build trust with our customers," he added.
The institution's inception can be traced back to five independent "trustee savings banks" that were established in Waterford, Cork, Dublin, Monaghan and Limerick between 1816 and 1820.
They were used by ordinary people as places to save and borrow small sums of money, with savings capped at no more than £50 a year.
Among the founders of the Dublin Savings Bank were Arthur Guinness and members of the Bewley and Jameson families.
Separately, the Irish Temperance Permanent Benefit Building Society was founded in 1884 in Dublin.
It later changed its name in 1888 to the Irish Permanent Benefit Building Society in 1888, which was later shortened to Irish Permanent Building Society in 1940.
In 1977 the Monaghan Savings Bank was acquired by the Dublin Savings Bank, with the Cork and Limerick Savings Banks merging in 1986.
The Waterford Savings Bank then merged in 1988 with what had become the Trustee Savings Bank Dublin (TSB Dublin).
The Cork and Limerick Savings Banks then merged with TSB Dublin in 1992, leading to the launch of TSB Bank.
Two years later Irish Permanent Building Society de-mutualised and became a stock market listed firm.
But five years later in 1999 it merged with the largest insurance provider in Ireland, Irish Life, to become Irish Life and Permanent plc.
That business then bought TSB Bank in 2001 and in integrating it with Irish Permanent created a new retail bank, Permanent TSB (PTSB).
Poor lending practices coupled with the wider financial crash later forced the Government into a bailout of Irish Life and Permanent and to the State taking control of 99.2% of the business in 2011.
PTSB later separated from Irish Life and Permanent in 2012 to become the standalone bank we know today.
The archive was launched by the Minister for Finance, who said it will enhance understanding of the origins of one of Ireland's oldest financial institutions.
"If the Decade of Centenaries has taught us anything it is the value of our historical records and primary sources and it is great to see Permanent TSB investing in its archival heritage," Paschal Donohoe said.