Leawood-based Aslin Group, the holding company for Alterra Bank, announced that Alterra has been acquired by Wisconsin-based First Business Financial Services. Alterra, a privately owned, business-oriented bank, has two locations and about 48 employees. First Business is publicly traded, and employs 166 people. Alterra brings $223 million in assets, creating a total of $1.5 billion for First Business. The selling price was $30.1 million in cash and stock.