Annual report pursuant to Section 13 and 15(d)

FHLB Advances and Other Borrowings - Additional Information (Detail)

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FHLB Advances and Other Borrowings - Additional Information (Detail) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Federal Home Loan Banks [Abstract]      
Pledged loans receivable, carrying value $ 993,200,000    
Total borrowing capacity available from the collateral 736,600,000    
Available borrowing capacity 421,600,000    
Available for use through the Fed Discount Window 10,500,000    
Pledged loans, carrying values 10,700,000    
Borrowings 0    
Advances from the FHLB 315,000,000 $ 170,000,000  
Increase in the advances from the FHLB 145,000,000    
Interest on FHLB advances $ 879,000 $ 76,000 $ 151,000
Weighted-average interest rates 0.45% 0.20% 0.21%