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, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Disclosure [Abstract]      
Pledged loans receivable, carrying value $ 2,360,000,000    
Total borrowing capacity available from the collateral 1,540,000,000    
Remaining available borrowing capacity 1,090,000,000.00    
Available for use through the Federal Reserve Bank of San Francisco discount window 23,200,000 $ 22,000,000  
Pledged loans, carrying values 24,800,000 23,400,000  
Outstanding borrowing capacity 0 0  
Borrowings 0    
Advances from the FHLB 325,000,000 350,000,000.0  
Decrease in the advances from the FHLB   25,000,000  
Open advances 212,500,000 250,000,000  
Term borrowings 112,500,000 100,000,000  
Interest expense on FHLB $ 6,900,000 $ 2,200,000 $ 1,700,000
FHLB, advances, weighted average interest rate 4.69% 3.57%  
FHLB, advances, weighted-average interest rate during the year 3.48% 1.52% 1.17%
Open advances (percent) 5.70% 4.65%  
Weighted average interest rate of outstanding advances (percent) 2.77% 0.87%