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Cash and Cash Equivalents	12 Months Ended
Cash and Cash Equivalents	Dec. 31, 2018
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash Equivalents The Company is required to maintain an average reserve balance with the FRB or maintain such reserve balance in the form of cash. The average required reserve balance for the years ended December 31, 2018 and 2017 was approximately $110.2 million and $76.5 million, respectively, and was met by holding cash and maintaining an average balance with the FRB.