Annual report pursuant to Section 13 and 15(d)

Borrowings - Additional Information (Detail)

v3.20.4
Borrowings - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument [Line Items]      
Pledged loans receivable, carrying value $ 2,170,000,000    
Total borrowing capacity available from the collateral 1,730,000,000    
Available borrowing capacity 1,440,000,000    
Available for use through the Federal Reserve Bank of San Francisco Discount Window 26,300,000    
Pledged loans, carrying values 27,300,000    
Borrowings 0    
Advances from the FHLB 150,000,000.0 $ 90,000,000.0  
Increase in the advances from the FHLB 60,000,000.0    
Interest expense on FHLB $ 2,200,000 $ 763,000 $ 3,400,000
Weighted-average interest rates 1.42% 1.89% 1.94%
Payment Protection Program      
Debt Instrument [Line Items]      
Borrowings $ 0    
Available borrowing capacity $ 300,400,000    
Maturity date Mar. 31, 2021