Annual report pursuant to Section 13 and 15(d)

Borrowings - Additional Information (Detail)

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Borrowings - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]      
Pledged loans receivable, carrying value $ 2,300,000,000    
Total borrowing capacity available from the collateral 1,840,000,000    
Available borrowing capacity 1,610,000,000    
Available for use through the Federal Reserve Bank of San Francisco Discount Window 32,800,000    
Pledged loans, carrying values 34,700,000    
Borrowings 0    
Advances from the FHLB 137,500,000 $ 150,000,000.0  
Decrease in the advances from the FHLB 12,500,000    
Interest expense on FHLB $ 1,700,000 $ 2,200,000 $ 763,000
Weighted-average interest rates 1.17% 1.42% 1.89%