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Certificates of Deposit (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Sep. 30, 2014
Banking and Thrift [Abstract]      
Certificates of deposit less than $100,000 $ 141,946 $ 184,471 $ 208,972
Certificates $100,000 to $250,000 204,707 221,892 210,042
Certificates $250,000 and over 42,654 41,138 44,762
Total certificates of deposit $ 389,307 $ 447,501 $ 463,776