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Certificates of Deposit (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Banking and Thrift [Abstract]      
Certificates of deposit less than $100,000 $ 237,382 $ 158,529 $ 161,518
Certificates $100,000 to $250,000 199,599 175,077 278,429
Certificates $250,000 and over 42,568 37,376 38,172
Total certificates of deposit $ 479,549 $ 370,982 $ 478,119