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Deposits - Total deposits (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Deposits      
Certificates of deposit $ 1,709,175 $ 1,775,095 $ 1,820,122
Interest-bearing demand deposits 5,682,129 5,407,175 5,195,871
Non-interest bearing demand deposits 3,307,532 3,061,769 3,157,478
Savings deposits 1,317,705 1,399,815 1,433,724
Other time deposits 7,246 3,079 6,680
Total deposits $ 12,023,787 $ 11,646,933 $ 11,613,875