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Certificates of Deposit (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Banking and Thrift [Abstract]      
Certificates of deposit of less than $100,000 $ 319,292 $ 372,464 $ 389,317
Certificates $100,000 to $250,000 278,050 162,185 168,402
Certificates $250,000 and over 64,431 56,760 61,690
Total certificates of deposit $ 661,773 $ 591,409 $ 619,409