Oh been done in Australia in 1995
Ha ha , here in Australia back in 1995 Westpac Bank Ltd took over a Perth , Western Australia based bank called Challenge.
Now sadly the resulting merger and integration of the Challenge Bank Customer Data Base and identicafion of customers real money was soo poorly mismanaged , so as to deliberately deprive all existing Challenge Bank customers access to any account or credit funds for well in excess of 48 hours or more! , as the computer challenged Wank Bank IT staff desperately sought ways to fix the problems caused by their own ineptitude and very poor planning!
In the the end Westpac , then publically apologised with large scale Newspaper Adds within the state of Western Australia , addressing former Challenge Bank customers , saying literally we didn't mean to stick it too you! , please stay we promise to do better!
Sadly , however the damage had been done! , and no amount of redress on the Westpac side of the fence could prevent the stampede or loss the vast majority of the Challenge Bank customers , as they moved valued credit funds and assets to other financial institutions like Credit Unions etc(the major australian trading banks shameful activities(excluding the NATIONAL AUSTRALIA BANK(NAB) whose then GM point blank refused to join the stampede of the idiots , by asking the simple question "Does it fit the official standard lending criteria? or so the story goes") struggling to survive in the face of a vast sea of red ink from bad unpayable very large debts of many billions of dollars(20 or 30?) generated by gross anything goes stupidity lending of the late eighties based on the guesstimated final developed value and not the ability of the land developer to deliver the goods(Alan Bond/Christopher Skase to name but a few and destroyed all State controlled Banks at the same time) caused a literal hundredfold increase in the more secured Credit Union customer base as the banks put the screws into their financially secure customers by excessively ramping up the fees slashing staff and branches by 50% or more to cover and artificially hide the losses from the balance sheets)
Westpac the Bank had become so desperate to correct it's balance sheet , that it's board , chose to transfer a large surplus from it's own pension fund which the trustees had set aside for post 2012 payouts to retiring staff back into general revenue to hide the embarassing losses , and sacked the messenger who warned the board(he then went on to enlarge and enhance a local bank in Westpac's home state of origin to rival the size of the bank within that state, of his former bosses gaining many of it's wealthy cheesed off customers as well , annoyed at large scale fee increases well above the level of inflation)
In the interim the name Westpac was hidden from sight as a trading entity due to it's bad name as the scurge of good banking practices , run by an ex Wells Fargo man(remember this is the same bank that lost it's shirt in Argentina in the eighties and hit number one on the US FDIC watch list as well) , for over a decade until recently it re-emerged from the doldrums , and is still struggling with a declining customer base even though it ranks number three based on capital , but on customer numbers , number four of four and still a falling star!
So been there , done that in Australia in the nineties!
Interestingly , the combined debts of the ten million or so Australians on credit cards issued today by the local Australian Banks is now far larger than that which caused the Banker's lending crash of 91/92 in Australia!
Life does indeed move in circles!