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Deposits - Total deposits (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Deposits      
Certificates of deposit $ 1,640,324 $ 1,651,399 $ 1,756,637
Interest-bearing demand deposits 5,993,448 5,966,496 5,562,111
Non-interest bearing demand deposits 3,367,422 3,245,306 3,219,864
Savings deposits 1,337,730 1,309,896 1,374,557
Other time deposits 5,623 3,999 5,802
Total deposits $ 12,344,547 $ 12,177,096 $ 11,918,971