Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Financial assets:
Securities	$ 127,515	$ 129,291
Bank-owned life insurance	9,419	8,298
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	37,066	66,878
Loans held for sale	103
Securities	127,515	129,291
Net loans	373,246	360,000
Bank-owned life insurance	9,419	8,298
Restricted stock	5,463	5,463
Accrued interest receivable	1,343	1,317
Financial liabilities:
Deposits	462,845	475,443
Short-term borrowings	41,851	43,992
Other borrowings	12,558	12,672
Accrued interest payable	124	135
Fair Value [Member]
Financial assets:
Cash and cash equivalents	37,066	66,878
Loans held for sale	103
Securities	127,515	129,291
Net loans	377,473	367,028
Bank-owned life insurance	9,419	8,298
Restricted stock	5,463	5,463
Accrued interest receivable	1,343	1,317
Financial liabilities:
Deposits	463,922	476,942
Short-term borrowings	41,851	43,992
Other borrowings	13,185	13,772
Accrued interest payable	124	135
Fair Value [Member] | Level I [Member]
Financial assets:
Cash and cash equivalents	37,066	66,878
Loans held for sale	103
Securities	1,207	169
Bank-owned life insurance	9,419	8,298
Accrued interest receivable	1,343	1,317
Financial liabilities:
Deposits	312,312	317,369
Short-term borrowings	41,851	43,992
Accrued interest payable	124	135
Fair Value [Member] | Level II [Member]
Financial assets:
Securities	126,308	129,122
Restricted stock	5,463	5,463
Fair Value [Member] | Level III [Member]
Financial assets:
Net loans	377,473	367,028
Financial liabilities:
Deposits	151,610	159,573
Other borrowings	$ 13,185	$ 13,772