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, 2018
Dec. 31, 2017
Dec. 31, 2016
Federal Home Loan Banks [Abstract]      
Pledged loans receivable, carrying value $ 1,100,000,000    
Total borrowing capacity available from the collateral 924,400,000    
Available borrowing capacity 729,400,000    
Available for use through the Fed Discount Window 29,300,000    
Pledged loans, carrying values 29,900,000    
Borrowings 0    
Advances from the FHLB 55,000,000 $ 150,000,000  
Decrease in the advances from the FHLB 95,000,000    
Interest on subordinated debentures $ 3,379,000 $ 1,077,000 $ 879,000
Weighted-average interest rates 1.94% 0.90% 0.45%