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Deposits (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Deposits Disclosure [Line Items]    
Time Deposits, $250,000 or More $ 1,690,000,000 $ 1,850,000,000
Securities pledged as collateral 325,000,000.0 376,100,000
Brokered deposits 720,600,000 1,140,000,000
Noninterest bearing 5,427,174,000 4,814,254,000
Money market and NOW accounts 5,009,419,000 5,232,413,000
Savings deposits 305,326,000 300,770,000
Time deposits 3,559,350,000 3,986,475,000
Total deposits $ 14,301,269,000 $ 14,333,912,000
Percent of total deposit balance, by type 100.00% 100.00%
Money market and NOW accounts    
Deposits Disclosure [Line Items]    
Brokered deposits $ 376,600,000 $ 735,000,000.0
Percent of total deposit balance, by type 35.00% 36.00%
Time deposit accounts    
Deposits Disclosure [Line Items]    
Brokered deposits $ 344,000,000.0 $ 400,600,000
Noninterest Bearing Demand Deposits    
Deposits Disclosure [Line Items]    
Percent of total deposit balance, by type 38.00% 34.00%
Savings Deposits    
Deposits Disclosure [Line Items]    
Percent of total deposit balance, by type 2.00% 2.00%
Bank Time Deposits    
Deposits Disclosure [Line Items]    
Percent of total deposit balance, by type 25.00% 28.00%
California State Treasurer    
Deposits Disclosure [Line Items]    
Time Deposits, $250,000 or More   $ 300,000,000.0
Required eligible collateral pledge on outstanding deposits, minimum percentage 110.00%  
Securities pledged as collateral $ 319,300,000 $ 368,200,000