Commitments and Off-Balance Sheet Risk (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Commitments and Off-Balance Sheet Risk (Additional Textual) [Abstract]
Reserve or liability balance for financial instruments with off-balance sheet risk	$ 0
Line of credit facilities	1 year
Libor rate period	30 days
Fixed rate range of term debt secured by real estate, Minimum	4.00%
Fixed rate range of term debt secured by real estate, Maximum	7.00%
Term debt secured by real estate balloon payment period	5 years
Term debt secured by non real estate collateral maturity period	5 years
Notional amount of the underlying interest rate swap agreements, entered into by commercial loan customers with correspondent banks	29.7
Net fair value of interest rate swaps entered into by commercial loan customer's with correspondent banks	4.1
Liabilities for accreted fee collected from customer	0.1	0.2
Amount of federal reserve requirement	$ 1.2	$ 0.9
Maximum [Member]
Commitments and Off-Balance Sheet Risk (Textual) [Abstract]
Amortization period for term debt secured by real estate	20 years
Interest rates on loans secured by non real estate collateral	7.50%
Fees accreted into income during interest rate swap agreements years	15 years
Minimum [Member]
Commitments and Off-Balance Sheet Risk (Textual) [Abstract]
Amortization period for term debt secured by real estate	10 years
Interest rates on loans secured by non real estate collateral	4.00%
Fees accreted into income during interest rate swap agreements years	4 years