Disclosures About Fair Value of Assets and Liabilities (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income
Non Interest Income	$ 320	$ 359	$ 600	$ 1,157
Hedged loans [Member]
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income
Non Interest Income	112	394	336	335
Fair value interest rate swap agreements [Member]
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income
Non Interest Income	(112)	(394)	(336)	(335)
Derivative loan commitments [Member]
Realized gains and losses included in net income for the periods in the condensed consolidated statements of income
Non Interest Income	$ 320	$ 359	$ 600	$ 1,157