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Cash and Due from Banks	12 Months Ended
Cash and Due from Banks	Dec. 31, 2019
Cash and Due from Banks [Abstract]
Cash and Cash Equivalents Disclosure [Text Block]	Cash and Due from Banks Cash and due from banks includes cash on hand, cash items in the process of collection, compensating balances, and amounts due from correspondent banks and the Federal Reserve Bank. COMPENSATING BALANCES The Bank maintains collected cash balances with commercial banks in return for certain services. These arrangements contain no legal restrictions on the withdrawal of funds. Average collected cash balances were $100 million and $63 million for the years ended December 31, 2019 and 2018. PASS-THROUGH DEPOSIT RESERVES The Bank acted as a pass-through correspondent for certain member institutions required to deposit reserves with the Federal Reserve Bank of Chicago until this service was discontinued in October 2019. As a result, at December 31, 2019, the Bank had no pass-through deposit reserves. At December 31, 2018, pass-through deposit reserves amounted to $30 million.