Income Taxes (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Abstract]
Statutory tax rate (in hundredths)	34.00%	34.00%	34.00%	34.00%
Increase (decrease) resulting from -
Tax exempt interest (in hundredths)	(7.60%)	(7.60%)	(6.90%)	(9.50%)
Tax exempt income on bank owned life insurance (in hundredths)	(1.80%)	(1.80%)	(1.70%)	(2.20%)
Other, net (in hundredths)	(0.10%)	1.50%	0.00%	0.90%
Effective tax rate (in hundredths)	24.50%	26.10%	25.40%	23.20%