Associated Banc-Corp is Wisconsin's second- largest bank with more than $20 billion in assets and nearly 300 offices. Half of its loans are in its home state, followed by 20% and 15% in neighboring Illinois and Minnesota, respectively. The rest are among 40 other states. About 30% of its portfolio is commercial real estate and construction loans. General commercial loans, home equity lines, and residential mortgages account for roughly 25%, 20%, and 20%, respectively.