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Other Borrowings - Textual (Details) - USD ($)
Mar. 31, 2021
Dec. 31, 2020
Federal Home Loan Bank, Advances [Line Items]    
Credit facility with the FHLB $ 926,300,000  
FHLB advances outstanding 0 $ 0
Federal funds purchased 0 0
Credit facility with the Federal Reserve Bank of San Francisco 215,000,000.0  
Federal Reserve Bank Advances    
Federal Home Loan Bank, Advances [Line Items]    
Credit facility with the Federal Reserve Bank of San Francisco 48,900,000  
PPPLF Facility [Member]    
Federal Home Loan Bank, Advances [Line Items]    
Credit facility with the Federal Reserve Bank of San Francisco 909,700,000  
Borrowings outstanding $ 0 $ 0