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CASH AND DUE FROM BANKS	12 Months Ended
CASH AND DUE FROM BANKS	Dec. 31, 2020
Cash and Cash Equivalents [Abstract]
CASH AND DUE FROM BANKS	CASH AND DUE FROM BANKS The Heartland banks are required to maintain certain average cash reserve balances as a non-member bank of the Federal Reserve System. On March 15, 2020, the Federal Reserve temporarily suspended the reserve requirement due to the COVID-19 pandemic. The reserve balance requirement at December 31, 2019 was $46.8 million.