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Deposits (Details) - USD ($)
Jun. 30, 2019
Dec. 31, 2018
Deposits Disclosure [Line Items]    
Time Deposits, $250,000 or More $ 1,810,000,000 $ 1,770,000,000
Securities pledged as collateral 0  
California State Treasurer    
Deposits Disclosure [Line Items]    
Time Deposits, $250,000 or More 300,000,000.0 300,000,000
Securities pledged as collateral 333,700,000 336,800,000
Brokered deposits 1,480,000,000 1,570,000,000
Money market and NOW accounts | California State Treasurer    
Deposits Disclosure [Line Items]    
Brokered deposits 266,900,000 370,400,000
Time deposits | California State Treasurer    
Deposits Disclosure [Line Items]    
Brokered deposits $ 1,210,000,000 $ 1,200,000,000