Question: DVB Bank SE is part of which second largest bank in Germany by asset size and the central institution for more than 1,000 co-operative banks and their 12,000 branch offices?

full_context: Document 1: TakarékBank: TakarékBank is a banking and financial services corporation in Hungary and it is the central institution for more than 60 co-operative banks and their 1,100 branch offices. TakarékBank consolidates its co-operative banks and forms the Takarék Group, which is the fourth largest bank in Hungary by AUM of 1,889 billion Hungarian forint.
Document 2: Bankcard-Servicenetz: The Bankcard-Servicenetz ("bank card service network") is a German ATM card interbank network group provided by the Volksbanken und Raiffeisenbanken services group. Technically it is not an interbank network but uses the pre-existing girocard network. Member banks of this cash credit group charge ATM usage fees at a low level and most customers of the co-operative banks enjoy free withdrawal from their accounts. With 19,200 ATMs the Bankcard-Servicenetz group is the second largest ATM group in Germany (after the savings banks network).
Document 3: Rabobank: Rabobank (] ; full name: "Coöperatieve Rabobank U.A.") is a Dutch multinational banking and financial services company headquartered in Utrecht, Netherlands. It is a global leader in food and agriculture financing and sustainability-oriented banking. The group comprises 129 independent local Dutch Rabobanks (2013), a central organisation (Rabobank Nederland), and a large number of specialised international offices and subsidiaries. Food and agribusiness constitute the primary international focus of the Rabobank Group. Rabobank is the second-largest bank in the Netherlands in terms of total assets.
Document 4: DZ Bank: DZ Bank AG is the second largest bank in Germany by asset size and the central institution for more than 1,000 co-operative banks and their 12,000 branch offices. Within the Volksbanken Raiffeisenbanken Co-operative financial network, which is one of Germany's largest private sector financial service organisations, DZ Bank functions both as a central institution and as a corporate and investment bank.
Document 5: State Bank of India: State Bank of India (SBI) is an Indian multinational, public sector banking and financial services company. It is a government-owned corporation with its headquarters in Mumbai, Maharashtra. On 1st April, 2017, State Bank of India, which is India's largest Bank merged with five of its Associate Banks (State Bank of Bikaner & Jaipur, State Bank of Hyderabad, State Bank of Mysore, State Bank of Patiala and State Bank of Travancore) and Bharatiya Mahila Bank with itself. This is the first ever large scale consolidation in the Indian Banking Industry. With the merger, State Bank of India will enter the league of top 50 global banks with a balance sheet size of ₹33 trillion, 278,000 employees, 420 million customers, and more than 24,000 branches and 59,000 ATMs. SBI's market share will increase to 22 percent from 17 per cent. It has 198 offices in 37 countries; 301 correspondents in 72 countries. The company is ranked 232nd on the "Fortune Global 500" list of the world's biggest corporations as of 2016.
Document 6: Rosbank: Rosbank (Russian: Росбанк) is a Russian universal bank whose majority shareholder is the international financial group Société Générale. As of December 2014, Rosbank's assets are the 12th among Russian banks.
Document 7: HypoVereinsbank: UniCredit Bank Aktiengesellschaft, better known under its brand name Hypovereinsbank (HVB), is the fifth-largest of the German financial institutions, ranked according to its total assets, and the fourth largest bank in Germany according to the number of its employees. Its registered office is in Munich and it is a member of the Cash Group. Since 2005, UniCredit Bank AG has been a subsidiary of UniCredit S.p.A., an Italian financial service provider with its registered office in Rome and its headquarters in Milan. When the transfer resolution was entered in the commercial register in 2008, the equities of the minority shareholders were transferred to the principal shareholder, UniCredit S.p.A. as part of a squeeze-out. HVB thus became a wholly subsidiary and has not been listed on the stock exchange since this time.
Document 8: Frankfurt: Frankfurt, officially Frankfurt am Main (Literally "Frankfurt on the Main", ] ), is a metropolis and the largest city in the German state of Hesse and the fifth-largest city in Germany, with a 2015 population of 732,688 within its administrative boundaries, and 2.3 million in its urban area. The city is at the centre of the larger Frankfurt Rhine-Main Metropolitan Region, which has a population of 5.5 million and is Germany's second-largest metropolitan region after Rhine-Ruhr. Since the enlargement of the European Union in 2013, the geographic centre of the EU is about 40 km to the east of Frankfurt's CBD, the Bankenviertel. Frankfurt is culturally and ethnically diverse, with around half of the population, and a majority of young people, having a migration background. A quarter of the population are foreign nationals, including many expatriates.
Document 9: Volksbanken und Raiffeisenbanken: Volksbanken und Raiffeisenbanken is a brand of co-operative banks in Germany. "Volksbank" derives from People's Bank institutes (co-operatives originally created by a local population often based in a town) and "Raiffeisenbanken" refers to banks founded on initiatives by Friedrich Wilhelm Raiffeisen (who was pioneering farmer credit unions). Many co-operative banks in Germany have either "Volksbank" or "Raiffeisenbank" in their name – the nationwide services and associations in the co-operative branch of the German financing industry used the compound of the plurals of these words (so it translates as "Peoples banks and Raiffeisen banks").
Document 10: IKB Deutsche Industriebank: IKB Deutsche Industriebank AG (FWB: IKBG) is a bank headquartered in Düsseldorf, Germany. IKB supports medium-sized enterprises in Germany and Europe with loans, risk management, capital market services and advisory services. The online offering for retail banking customers covers overnight and term money, bank savings schemes, bank deposits and selected commercial papers. With total assets of €18.8 billion and about 1,500 employees the bank has a medium-size. The bank has ten branches in Germany and Europe as well as different subsidiaries. IKB is listed on Entry Standard (Frankfurt am Main) and primary market (Düsseldorf). Single shareholder is the investment company Lone Star.
Document 11: Union Investment: Union Investment (formal name Union Asset Management Holding AG) is the investment arm of the DZ Bank Group and part of the cooperative financial services network. It was founded in 1956 and is headquartered in Frankfurt.
Document 12: DVB Bank: DVB Bank SE is part of the DZ BANK Group and a specialist in international transportation finance, based in Frankfurt/Main, Germany.
Document 13: Frankfurt: Frankfurt, officially Frankfurt am Main (Literally "Frankfurt on the Main", ] ), is a metropolis and the largest city in the German state of Hesse and the fifth-largest city in Germany, with a 2015 population of 732,688 within its administrative boundaries, and 2.3 million in its urban area. The city is at the centre of the larger Frankfurt Rhine-Main Metropolitan Region, which has a population of 5.5 million and is Germany's second-largest metropolitan region after Rhine-Ruhr. Since the enlargement of the European Union in 2013, the geographic centre of the EU is about 40 km to the east of Frankfurt's CBD, the Bankenviertel. Frankfurt is culturally and ethnically diverse, with around half of the population, and a majority of young people, having a migration background. A quarter of the population are foreign nationals, including many expatriates.
Document 14: Australia and New Zealand Banking Group: The Australia and New Zealand Banking Group Limited, commonly called ANZ, is the fourth largest bank by market capitalisation in Australia, after the Commonwealth Bank, Westpac Banking Corporation and National Australia Bank. Australian operations make up the largest part of ANZ's business, with commercial and retail banking dominating. ANZ is also the largest bank in New Zealand, where the legal entity became known as ANZ National Bank Limited in 2003 and changed to ANZ Bank New Zealand Limited in 2012. From 2003 to 2012 it operated two brands in New Zealand, ANZ and the National Bank of New Zealand. The National Bank brand was retired in 2012, with a number of branches closing and others converting to ANZ branches.
Document 15: Dubai Bank Kenya: Dubai Bank Kenya (DBK), whose complete name is Dubai Bank Kenya Limited, but is often referred to as Dubai Bank, was a commercial bank in Kenya, the largest economy in the East African Community. It was licensed by the Central Bank of Kenya, the central bank and national banking regulator. The institution is not affiliated with Dubai Bank of United Arab Emirates or with that bank's parent company, Dubai Banking Group.
ground_truth: DZ Bank AG