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Federal Home Loan Bank Advances - Additional Information (Detail)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
Loans
Dec. 31, 2015
USD ($)
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Total Borrowings $ 10,000 $ 10,000
Number of FHLB Loans | Loans 2  
Unsecured borrowings through correspondent banks $ 58,000 58,000
Unpledged securities which could be sold or used as collateral 71,800 29,400
Additional borrowings available from the Federal Home Loan Bank based on current pledging 4,700 4,100
Maximum unsecured borrowing available $ 115,700 118,500
FHLB Loan One [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Interest rate of loans 1.61%  
FHLB Loan Two [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Interest rate of loans 1.34%  
Mortgage Loans at Cost [Member]    
Federal Home Loan Bank, Advances, Branch of FHLB Bank [Line Items]    
Advances, secured by mortgage loans $ 17,900 $ 20,000