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Borrowing Arrangements (Details 2) (Securities sold under agreements to repurchase, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Securities sold under agreements to repurchase
     
Securities sold under agreements to repurchase      
Maturity period 2 years 6 months    
Average balance during the year   $ 712,000 $ 18,767,000
Average interest rate during the year (as a percent) 0.00% 3.37% 2.23%
Maximum month-end balance during the year   $ 5,000,000 $ 25,000,000
Average rate at December 31 (as a percent)     3.09%