Allowance for Loan Losses - Allowance for Loan Losses Disaggregated Based on Loan Receivables Evaluated for Impairment Individually and Collectively by Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	$ 1,357	$ 1,534
Collectively evaluated for impairment	2,750	2,689
Total allowance for loan losses	4,107	4,223	[1]
Mortgage Loans on Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	1,082	1,256
Collectively evaluated for impairment	2,328	2,246
Total allowance for loan losses	3,410	3,502
Commercial and Industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Individually evaluated for impairment	275	278
Collectively evaluated for impairment	304	321
Total allowance for loan losses	579	599
Consumer and Other Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collectively evaluated for impairment	118	122
Total allowance for loan losses	$ 118	$ 122

[1] Derived from Audited December 31, 2015 Financial Statements.