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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 Due from Banks	Cash and Due from Banks Regulations of the Board of Governors of the Federal Reserve System impose uniform reserve requirements on all depository institutions with transaction accounts, such as checking accounts and NOW accounts. Reserves are maintained in the form of vault cash or balances held with the local Federal Reserve Bank. First Commonwealth Bank maintained average balances of $14.7 million during 2019 and $4.9 million during 2018 with the Federal Reserve Bank of Cleveland.