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CASH AND CASH EQUIVALENTS
12 Months Ended
Dec. 31, 2017
Cash and Cash Equivalents [Abstract]  
CASH AND CASH EQUIVALENTS
CASH AND CASH EQUIVALENTS
 
Cash and cash equivalents include cash on hand, amounts due from banks, and short-term investments with original maturities of 90 days or less. Short-term investments included $2.1 million and $0.9 million pledged as collateral support for derivative financial contracts at year-end 2017 and 2016, respectively. The Federal Reserve Bank requires the Bank to maintain certain reserve requirements of vault cash and/or deposits. The reserve requirement, included in cash and equivalents, was $20.4 million and $17.0 million at year-end 2017 and 2016, respectively.