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Certificates of Deposit (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Banking and Thrift [Abstract]      
Certificates of deposit of less than $100,000 $ 377,806 $ 372,464 $ 400,680
Certificates $100,000 to $250,000 268,296 162,185 204,311
Certificates $250,000 and over 70,896 56,760 52,400
Total certificates of deposit $ 716,998 $ 591,409 $ 657,391