Estimated Fair Values of Company's Financial Instruments (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Financial assets
Cash and cash equivalents	$ 9,788	$ 12,701	$ 25,291	$ 39,164
Loans, net of allowance	346,357	327,226
Federal Home Loan Bank stock	4,210	4,210
Accrued interest receivable	788	803
Financial liabilities
Deposits	326,979	323,622
Short term borrowings	10,065	5,691
Federal Home Loan Bank Advances	33,249	26,530
Subordinated debentures	4,124	4,124
Interest payable	99	123
Fair Value, Inputs, Level 1
Financial assets
Cash and cash equivalents	9,788	12,701
Loans, net of allowance	0	0
Federal Home Loan Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities
Deposits	0	0
Short term borrowings	0	0
Federal Home Loan Bank Advances	0	0
Subordinated debentures	0	0
Interest payable	0	0
Fair Value, Inputs, Level 2
Financial assets
Cash and cash equivalents	0	0
Loans, net of allowance	0	0
Federal Home Loan Bank stock	4,210	4,210
Accrued interest receivable	788	803
Financial liabilities
Deposits	314,134	307,172
Short term borrowings	10,065	5,691
Federal Home Loan Bank Advances	33,858	27,347
Subordinated debentures	3,238	3,238
Interest payable	99	123
Fair Value, Inputs, Level 3
Financial assets
Cash and cash equivalents	0	0
Loans, net of allowance	346,446	325,354
Federal Home Loan Bank stock	0	0
Accrued interest receivable	0	0
Financial liabilities
Deposits	0	0
Short term borrowings	0	0
Federal Home Loan Bank Advances	0	0
Subordinated debentures	0	0
Interest payable	$ 0	$ 0