The twin cities of Kalyan and Dombivli were joined and converted into the Kalyan-Dombivli municipal corporation in 1982 to improve the administration of the twin townships. The headquarter of this city is situated in Kalyan. Kalyan and Dombivli are both cities in the Thane District of Konkan division in Maharashtra state. The city comprises a majority of Hindu residents who speak mostly in Marathi. The weather in this city follows the exact trends as that of Mumbai and is known to experience the notorious Mumbai rains. The twin city of Kalyan-Dombivli had been under the reigns of the Mughal, the Portuguese as well as the British. The celebrated Maratha heroes, held in high esteem by the residents, were the only valiant defense against these foreign invasions. The city of Kalyan used to be surrounded by a fort wall which was constructed during the Mughal age and further improved by the Maratha rulers. It was called the Durgadi Fort. History claims that a small wooden temple dedicated to Durgadevi was behind the mosque inside this fort wall. However, this historical relic was dismantled by the British and the stones were used to build the piers of Thane and Kalyan. The idol in the temple was also stolen. Only the remnants of the north-west gate of this fort still remain to remind the people of the historic past.
Ratnakar Bank was founded in August 1943. According to Business World-PWC Best Bank Survey, it was rated as the fastest growing small bank simultaneously in the year 2013, 2014 and 2015. In the year 2013, it bought a particular business of the Royal Bank of Scotland due to which 1.5 lakh of RBS customers moved to RBL Bank. In the year 2016, it acquired a 30% stake in Swadharv Finserve Pvt Ltd.RBL bank started the first credit card for Gold enthusiasts in association with Indian Gold Union. To support the government campaigns such as Make In India and Startup India, the RBL Bank came up with the Startup Club to fulfill the end to end banking needs of the emerging entrepreneurial community. It has also started the financial literacy program referred to as "Shaksham" in association with CDC to provide education to 25000 individuals and 300 villages in the four districts of MP. The RBL bank has also been a banking partner for the Delhi Daredevils. RBL even started another financial literacy program "Swadhaar Finaccess" for women from lower-income communities in association with Swadhaar Information and Management Services in Gujarat and Mumbai.