Credit Concentrations (Details)	12 Months Ended
	Dec. 31, 2012
Real Estate Loans [Member] | Portfolio [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	76.00%
Real Estate Loans [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	37.00%
Commercial and Industrial [Member] | Portfolio [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	22.00%
Commercial and Industrial [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	10.00%
Consumer Loans [Member] | Portfolio [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	2.00%
Consumer Loans [Member] | Assets [Member] | Maximum [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	1.00%
Municipal Securities [Member] | Investment Securities [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	43.00%
Municipal Securities [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	11.00%
Collateralized Mortgage Obligations [Member] | Investment Securities [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	22.00%
Collateralized Mortgage Obligations [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	6.00%
Mortgage-Backed Securities [Member] | Investment Securities [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	15.00%
Mortgage-Backed Securities [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	4.00%
US Government Agencies Debt Securities [Member] | Investment Securities [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	16.00%
US Government Agencies Debt Securities [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	4.00%
Corporate Bond Securities [Member] | Investment Securities [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	4.00%
Corporate Bond Securities [Member] | Assets [Member]
Concentration Risk [Line Items]
Concentration risk, percentage (in hundredths)	1.00%