Why did our rural credit cooperatives become Jiangnan rural commercial banks?

Jiangsu Jiangnan Rural Commercial Bank Co., Ltd. is a prefecture-level joint-stock rural commercial bank voluntarily initiated and established by five small and medium-sized rural financial institutions under the jurisdiction of Changzhou City in accordance with the principle of marketization. Now the local Jiangnan Rural Commercial Bank is directly under Changzhou, and the recruitment examination is no longer the unified examination of Jiangsu Credit Cooperatives, but it has little impact on ordinary citizens, and the household registration and the like need not be changed for the time being.