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Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Financial assets:
Cash and due from banks	$ 7,530	$ 9,332
Interest-bearing deposits	6,663	6,627
Federal funds sold	444	2,669
Investment securities	103,298	100,490
Investments in restricted stock	1,363	1,448
Ground rents	172	175
Loans, net	252,070	249,632
Accrued interest receivable	1,320	1,450
Financial liabilities:
Deposits	334,141	332,289
Long-term borrowings	20,000	20,000
Dividends payable	274	0
Accrued interest payable	33	28
Off-balance sheet commitments	23,577	26,236
Financial assets:
Cash and due from banks	7,530	9,332
Interest-bearing deposits	6,663	6,627
Federal funds sold	444	2,669
Investment securities	103,298	100,490
Investments in restricted stock	1,363	1,448
Ground rents	172	175
Loans, net	253,847	251,419
Accrued interest receivable	1,320	1,450
Financial liabilities:
Deposits	311,832	314,680
Long-term borrowings	21,663	21,899
Dividends payable	274	0
Accrued interest payable	33	28
Off-balance sheet commitments	$ 23,577	$ 26,236

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