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Fair Value - Carrying Amount and Estimated Fair Values of Financial Instruments (Detail) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Financial assets
Securities available for sale	$ 17,639	$ 18,516
Loans held for sale	623	1,210
Carrying Value [Member]
Financial assets
Cash and cash equivalents	25,152	61,436
Interest-bearing deposits in other financial institutions	2,726	1,984
Securities available for sale	17,639	18,516
Loans held for sale	623	1,210
Loans, net	153,043	151,160
FHLB stock	1,942	1,942
Accrued interest receivable	105	92
Yield maintenance provisions (embedded derivatives)	990	999
Interest rate lock commitments	45	39
Financial liabilities
Deposits	(173,508)	(217,049)
FHLB advances	(10,000)	(15,742)
Subordinated debentures	(5,155)	(5,155)
Accrued interest payable	(98)	(300)
Interest-rate swaps	(990)	(999)
Fair Value [Member]
Financial assets
Cash and cash equivalents	25,152	61,436
Interest-bearing deposits in other financial institutions	2,726	1,984
Securities available for sale	17,639	18,516
Loans held for sale	623	1,210
Loans, net	156,256	155,159
Accrued interest receivable	105	92
Yield maintenance provisions (embedded derivatives)	990	999
Interest rate lock commitments	45	39
Financial liabilities
Deposits	(175,286)	(219,235)
FHLB advances	(10,338)	(16,327)
Subordinated debentures	(2,999)	(2,810)
Accrued interest payable	(98)	(300)
Interest-rate swaps	(990)	(999)
Fair Value [Member] | Fair Value, Inputs, Level 1 [Member]
Financial assets
Cash and cash equivalents	25,152
Interest-bearing deposits in other financial institutions	2,726
Securities available for sale
Loans held for sale
Loans, net
FHLB stock
Accrued interest receivable	10
Yield maintenance provisions (embedded derivatives)
Interest rate lock commitments
Financial liabilities
Deposits	(75,340)
FHLB advances
Subordinated debentures
Accrued interest payable
Interest-rate swaps
Fair Value [Member] | Significant Other Observable Inputs (Level 2) [Member]
Financial assets
Cash and cash equivalents
Securities available for sale	17,639
Loans held for sale	623
Loans, net
FHLB stock
Accrued interest receivable	95
Yield maintenance provisions (embedded derivatives)	990
Interest rate lock commitments	45
Financial liabilities
Deposits	(99,946)
FHLB advances	(10,338)
Subordinated debentures	(2,999)
Accrued interest payable	(98)
Interest-rate swaps	(990)
Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member]
Financial assets
Cash and cash equivalents
Interest-bearing deposits in other financial institutions
Securities available for sale
Loans held for sale
Loans, net	156,256
FHLB stock
Accrued interest receivable
Yield maintenance provisions (embedded derivatives)
Interest rate lock commitments
Financial liabilities
Deposits
FHLB advances
Subordinated debentures
Accrued interest payable
Interest-rate swaps

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair values as of the balance sheet date of all assets resulting from contracts that meet the criteria of being accounted for as derivative instruments, net of the effects of master netting arrangements.

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