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, 2014	Dec. 31, 2013
Carrying Amount
Assets
Cash and cash equivalents	$ 13,264	$ 10,244
Interest-bearing deposits	1,984	1,984
Loans, held for sale	423	341
Loans, net of allowance for losses	331,995	316,228
Stock in Federal Home Loan Bank	3,796	4,595
Interest receivable	2,391	2,178
Liabilities
Deposits	397,083	395,015
Borrowings	54,872	49,717
Interest payable	209	270
Fair Value Measurements Using Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets
Cash and cash equivalents	13,264	10,244
Interest-bearing deposits	1,984	1,984
Loans, held for sale
Loans, net of allowance for losses
Stock in Federal Home Loan Bank
Interest receivable
Liabilities
Deposits
Borrowings	4,155
Interest payable
Fair Value Measurements Using Significant Other Observable Inputs (Level 2)
Assets
Cash and cash equivalents
Interest-bearing deposits
Loans, held for sale	423	341
Loans, net of allowance for losses	340,790	330,073
Stock in Federal Home Loan Bank	3,796	4,595
Interest receivable	2,391	2,178
Liabilities
Deposits	397,388	395,924
Borrowings	44,920	44,538
Interest payable	209	270
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
Assets
Cash and cash equivalents
Interest-bearing deposits
Loans, held for sale
Loans, net of allowance for losses
Stock in Federal Home Loan Bank
Interest receivable
Liabilities
Deposits
Borrowings	7,218	7,218
Interest payable