XML 31 R11.htm IDEA: XBRL DOCUMENT

Cash and Cash Equivalents	12 Months Ended
Cash and Cash Equivalents	Dec. 31, 2017
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 Federal Reserve Bank or maintain such reserve balance in the form of cash. The average required reserve balance for the years ended December 31, 2017 and 2016 was approximately $76.5 million and $62.8 million, respectively, and was met by holding cash and maintaining an average balance with the Federal Reserve Bank.