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Deposits - Total deposits (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Deposits      
Certificates of deposit $ 1,732,554 $ 1,775,095 $ 1,804,657
Interest-bearing demand deposits 5,588,061 5,407,175 5,216,942
Non-interest bearing demand deposits 3,255,906 3,061,769 3,152,828
Savings deposits 1,339,293 1,399,815 1,458,208
Other time deposits 6,466 3,079 5,654
Total deposits $ 11,922,280 $ 11,646,933 $ 11,638,289