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Deposits - Total deposits (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deposits    
Certificates of deposit $ 2,810,075 $ 3,748,605
Non-interest bearing checking 11,498,840 9,711,338
Interest-bearing checking 9,018,987 6,955,575
Savings 3,350,547 2,694,011
Money market 8,376,380 7,584,353
Time deposits 6,100  
Total deposits $ 35,054,829 $ 30,693,882