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, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]      
Pledged loans receivable, carrying value $ 1,350,000,000    
Total borrowing capacity available from the collateral 1,110,000,000    
Available borrowing capacity 878,400,000    
Available for use through the Federal Reserve Bank of San Francisco Discount Window 29,600,000    
Pledged loans, carrying values 30,200,000    
Borrowings 0    
Advances from the FHLB 90,000,000 $ 55,000,000  
Increase in the advances from the FHLB 35,000,000.0    
Interest on subordinated debentures $ 763,000 $ 3,379,000 $ 1,077,000
Weighted-average interest rates 1.89% 1.94% 0.90%
Overnight advances from federal home loan banks $ 15,000,000.0