Quarterly report pursuant to Section 13 or 15(d)

Borrowings - Additional Information (Detail)

v3.20.2
Borrowings - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Debt Disclosure [Abstract]          
Overnight advances from federal home loan banks $ 0   $ 0   $ 15,000,000.0
Advances from the FHLB $ 150,000,000.0   $ 150,000,000.0   $ 75,000,000.0
Weighted average interest rate of outstanding advances (percent) 1.40%   1.40%   1.71%
Interest expense on borrowings $ 582,000 $ 367,000 $ 1,838,000 $ 439,000  
Weighted average interest rate of overnight advances (percent)         1.66%
Outstanding borrowings 0   0   $ 0
Pledged loans receivable, carrying value 2,270,000,000   2,270,000,000   1,350,000,000
Remaining available borrowing capacity 1,430,000,000   1,430,000,000    
FHLB statutory lending limit 1,570,000,000   1,570,000,000   878,400,000
Loans pledged with FRB 35,000,000.0   35,000,000.0   30,200,000
Borrowing capacity through Fed Discount Window $ 33,600,000   $ 33,600,000   $ 29,600,000