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Certificates of Deposit (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Sep. 30, 2016
Banking and Thrift [Abstract]      
Certificates of deposit of less than $100,000 $ 250,865 $ 195,115 $ 192,424
Certificates $100,000 to $250,000 202,722 240,904 183,991
Certificates $250,000 and over 43,257 40,601 48,040
Total certificates of deposit $ 496,844 $ 476,620 $ 424,455