Fraud in kisan credit card loan

I am working as manager in a psu bank. On 22/7/2015 at sainthal village of dausa distrcit rajasthan the bank sanctioned kcc of 1,80,000/- and disbursed 1,70,000/- to mr Jagdish gujar, mukesh gujar and mahesh gujar jointly. The land was in the name of jagdish gujar & was the principle borrower .Mukesh gujar and mahesh gujar were his son.After 3 -4 months jagdish gujar expired . On 30/5/2016 mukesh gujar and mahesh gujar approached the branch & deposited 1,79,000/- in full settlement of their kcc outstanding dues.The then branch manager and then loan officer deposited the money in their account and gave them no dues with their joint signature (signature of branch manager and loan officeron no dues)but didn't marked the closure of the account in CBS due to which entire 179000 remained as credit balance in kcct account. In sept 2016 the then branch manager credited interest subvention in that kcc account and even then also he didn't closed it in the system.Later on land mutation was done in the name of sons of jagdish gujar ,i.e.,mukesh gujar and mahesh gujar and they availed kcc from ICICI dausa on same land which was earlier mortgaged with my bank because after getting no dues from my bank the charge created in favor of my bank was removed .I was joined Sainthal on 06/2/2017 when I was in probation period On 04/5/2017 mr mukesh gujar and mr mahesh gujar came to branch and presented a kcc withdrawl having a joint signature of all thre,i.e., mr jagdish gujar,mrmahesh gujar and mr mukesh gujar.The amount they filled in withdrawl was Rs1,80,000/- and on the back of the witdrawl they wrote plese trnsfer the said amount to saving account of mr mohar singh gujar. I being the single officer of the branch posted the withdrawl and transferred it to the saving account of mr mohar singh gujar which was in same branch.After 2 minutes mr mohar singh gujar came to the branch and withdrawn 1,80,000 in cash from is saving account.Sinc then no money was deposited in kcc by them and on 20/02/2020 their kcc account with my became NPA with outstanding ledger balance 2,24,000/-. This fraud came into light when the incumbent branch officials went to the residence for recovery and the borower shown them the no dues. The incumbent manager of that ranch has now asked me and ten loan officer to adjust the dues in the ratio of 50-50 as the then branch manager who issued no dues has retiered from banks service on 30/9/2017. Otherwise the fraud will be reported to the controlling office which will not only recover the outstanding amount from our salary but also punish us with disciplanary action.Keeping this fact we agreed to bear the loss.But we now want to personally file suit against the fraudster mr mukesh gujar, mahesh gujar and mohar singh gujar.What are legal options open to us ? Please guide