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Certificates of Deposit (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Banking and Thrift [Abstract]      
Certificates of deposit less than $100,000 $ 161,518 $ 184,471 $ 220,360
Certificates $100,000 to $250,000 278,429 221,892 253,185
Certificates $250,000 and over 38,172 41,138 40,339
Total certificates of deposit $ 478,119 $ 447,501 $ 513,884