Disclosures About Fair Value of Financial Instruments - Estimated fair values of Corporation's financial instruments and level within fair value hierarchy (Unaudited) (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 19,152	$ 18,714
Investment securities available for sale	113,770	104,689
Loans, held for sale	394	87
Loans, net of allowance for losses	305,518	253,096
Stock in Federal Home Loan Bank	4,595	4,226
Interest receivable	2,292	1,996
Liabilities
Deposits	384,255	305,226
Interest payable	362	401
Carrying Amount
Assets
Cash and cash equivalents	19,152	18,714
Investment securities available for sale	113,770	104,689
Loans, held for sale	394	87
Loans, net of allowance for losses	305,518	253,096
Stock in Federal Home Loan Bank	4,595	4,226
Interest receivable	2,292	1,996
Liabilities
Deposits	384,255	305,226
Borrowings	49,717	65,217
Interest payable	362	401
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	19,152
Investment securities available for sale
Loans, held for sale
Loans, net of allowance for losses
Stock in Federal Home Loan Bank
Interest receivable
Liabilities
Deposits
Borrowings
Interest payable
Fair Value Measurements Using Significant Other Observable Inputs ( Level 2)
Assets
Cash and cash equivalents
Investment securities available for sale	112,573
Loans, held for sale	394
Loans, net of allowance for losses	331,543
Stock in Federal Home Loan Bank	4,595
Interest receivable	2,292
Liabilities
Deposits	386,068
Borrowings	45,849
Interest payable	362
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents
Investment securities available for sale	1,197
Loans, held for sale
Loans, net of allowance for losses
Stock in Federal Home Loan Bank
Interest receivable
Liabilities
Deposits
Borrowings	6,898
Interest payable
Fair Value
Assets
Cash and cash equivalents		18,714
Investment securities available for sale		104,689
Loans, held for sale		87
Loans, net of allowance for losses		260,907
Stock in Federal Home Loan Bank		4,226
Interest receivable		1,996
Liabilities
Deposits		309,156
Borrowings		68,546
Interest payable		$ 401