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Deposits - Total deposits - (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Deposits      
Certificates of deposit $ 1,820,122 $ 1,738,384 $ 1,083,814
Interest-bearing demand deposits 5,195,871 5,300,108 4,102,391
Non-interest bearing demand deposits 3,157,478 3,047,432 2,505,570
Savings deposits 1,433,724 1,443,918 1,363,944
Other time deposits 6,680 2,924 6,302
Total deposits $ 11,613,875 $ 11,532,766 $ 9,062,021