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Borrowings (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Scheduled maturities and weighted average rates of borrowings    
Year one $ 117,875 $ 901
Thereafter 103,878 103,878
Total $ 221,753 $ 104,779
Weighted Average Rate    
Year one (as a percent) 0.12% 0.03%
Thereafter (as a percent) 4.95% 4.95%
Total (as a percent) 2.38% 4.91%