Borrowings and Subordinated Debentures (Details) (USD $)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Advances from Federal Home Loan Banks [Abstract]
Percentage of over collateralized delivery requirement with federal home loan bank (in hundredths)	105.00%
Line of credit with federal home loan bank, amount	$ 150,000,000
Federal Home Loan Bank, advances, general debt obligations, disclosures, collateral pledged	58,900,000
Federal Home Loan Bank, advances, general debt obligations, disclosures, collateral pledged book value	47,300,000
Amount [Abstract]
Advances maturing in 2013	50,000,000	50,000,000
Advances maturing in 2017	15,000,000	15,000,000
Total FHLB borrowings	65,000,000	65,000,000
Rate [Abstract]
Advances maturing in 2013 (in hundredths)	2.64%	2.64%
Advances maturing in 2017 (in hundredths)	1.39%	1.39%
Subordinated Debentures [Line Items]
Number of Delaware trust affiliates	2
Interest payable in arrears	2,600,000
Trust Preferred Securities [Member]
Subordinated Debentures [Line Items]
Aggregate principal amount	25,000,000
Description of variable rate basis	3-month LIBOR
Interest payable in arrears	2,600,000
Trust Preferred Securities [Member] | Trust I [Member]
Other borrowings [Abstract]
Basis spread on variable rate (in hundredths)	2.15%
Subordinated Debentures [Line Items]
Aggregate principal amount	12,500,000
Junior subordinated debenture owed to unconsolidated subsidiary trust	12,900,000
Debt securities interest rate (in hundredths)	2.43%
Basis spread on variable rate (in hundredths)	2.15%
Trust Preferred Securities [Member] | Trust II [Member]
Other borrowings [Abstract]
Basis spread on variable rate (in hundredths)	2.15%
Subordinated Debentures [Line Items]
Aggregate principal amount	12,500,000
Junior subordinated debenture owed to unconsolidated subsidiary trust	12,900,000
Debt securities interest rate (in hundredths)	2.43%
Basis spread on variable rate (in hundredths)	2.15%
Common Securities [Member]
Subordinated Debentures [Line Items]
Aggregate principal amount	387,000
PNC Bank [Member]
Other borrowings [Abstract]
Description of variable rate basis	one month LIBOR
Notes payable [Member] | PNC Bank [Member]
Other borrowings [Abstract]
Notes payable with PNC Bank	3,200,000	3,300,000
Maturity date	Aug. 25, 2016
Basis spread on variable rate (in hundredths)	0.15%
Interest rate on notes payable (in hundredths)	0.35%
Subordinated Debentures [Line Items]
Basis spread on variable rate (in hundredths)	0.15%
Other Borrowings [Member] | PNC Bank [Member]
Other borrowings [Abstract]
Maturity date	Jan. 07, 2018
Other borrowings	$ 40,000,000	$ 40,000,000
Weighted average interest rate (in hundredths)	3.65%	3.65%