Fair Values of Financial Instruments - Schedule of Estimated Fair Values of Recognized Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Financial assets:
Securities, available for sale	$ 102,453	$ 129,291
Securities, held to maturity	35,690
Bank-owned life insurance	9,486	8,298
Carrying Value [Member]
Financial assets:
Cash and cash equivalents	48,619	66,878
Securities, available for sale	102,453	129,291
Securities, held to maturity	36,808
Loans held for sale	70
Net loans	372,357	360,000
Bank-owned life insurance	9,486	8,298
Restricted stock	5,463	5,463
Accrued interest receivable	1,509	1,317
Financial liabilities:
Deposits	480,861	475,443
Short-term borrowings	46,044	43,992
Other borrowings	12,511	12,672
Accrued interest payable	122	135
Fair Value [Member]
Financial assets:
Cash and cash equivalents	48,619	66,878
Securities, available for sale	102,453	129,291
Securities, held to maturity	35,690
Loans held for sale	70
Net loans	376,006	367,028
Bank-owned life insurance	9,486	8,298
Restricted stock	5,463	5,463
Accrued interest receivable	1,509	1,317
Financial liabilities:
Deposits	481,797	476,942
Short-term borrowings	46,044	43,992
Other borrowings	13,163	13,772
Accrued interest payable	122	135
Fair Value [Member] | Level I [Member]
Financial assets:
Cash and cash equivalents	48,619	66,878
Securities, available for sale	1,117	169
Loans held for sale	70
Bank-owned life insurance	9,486	8,298
Accrued interest receivable	1,509	1,317
Financial liabilities:
Deposits	334,445	317,369
Short-term borrowings	46,044	43,992
Accrued interest payable	122	135
Fair Value [Member] | Level II [Member]
Financial assets:
Cash and cash equivalents
Securities, available for sale	101,336	129,122
Securities, held to maturity	35,690
Restricted stock	5,463	5,463
Fair Value [Member] | Level III [Member]
Financial assets:
Cash and cash equivalents
Net loans	376,006	367,028
Financial liabilities:
Deposits	147,352	159,573
Other borrowings	$ 13,163	$ 13,772