Allowance for Loan Losses - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Property	Mar. 31, 2015 USD ($)	Dec. 31, 2015 Property	Apr. 30, 2015 USD ($) Property
Accounts, Notes, Loans and Financing Receivable [Line Items]
Period of nonperforming loans	90 days
Non-accruing loans excluded from impaired loan	$ 72,000	$ 95,000
Non-accruing loans accrued interest	$ 2,000	$ 9,000
No. of Properties | Property	16		16
Residential
Accounts, Notes, Loans and Financing Receivable [Line Items]
Residential properties collateralized with loan | Property	1
Residential mortgage loan amount	$ 556,000
No. of Properties | Property	3		3
Residential | Other assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Properties marketed for sale, value	$ 724,000
No. of Properties | Property	1
Branch Office | Other assets
Accounts, Notes, Loans and Financing Receivable [Line Items]
Properties marketed for sale, value				$ 390,000
No. of Properties | Property				1
Residential First Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance in order to assign a risk rating grade	$ 1,000,000
Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Minimum balance in order to assign a risk rating grade	$ 250,000