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Deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Non-interest bearing deposits    
Non-interest-bearing demand deposits $ 9,438,459 $ 7,317,161
Interest-bearing deposits    
Transaction 3,651,128 3,051,535
Savings 10,517,975 8,222,893
Time 2,871,031 2,014,524
Total interest-bearing deposits 17,040,134 13,288,952
Total deposits $ 26,478,593 $ 20,606,113