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Deposits - Remaining Maturities of Certificate of Deposit Accounts (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Total certificate of deposit accounts $ 1,437,890 $ 1,563,310
Certificates of Deposit [Member]    
Within 12 months 1,220,601 1,017,177
More than 12 months to 24 months 143,520 404,930
More than 24 months to 36 months 14,223 78,427
More than 36 months to 48 months 48,318 10,915
More than 48 months to 60 months 11,082 51,365
More than 60 months 146 496
Total certificate of deposit accounts $ 1,437,890 $ 1,563,310