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Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Dec. 31, 2011
Other Comprehensive Income          
Unrealized holding gains arising during the period $ 2,458 $ 5,303 $ 4,537 $ 13,863  
Less: reclassification adjustment for realized gains included in net income, net of taxes of $1 for three and nine months ended 2012, and $390 and $614, for three and nine months ended 2011, respectively 1 725 1 1,140  
Unrealized gains (losses) on securities, total 2,456 4,188 4,535 12,109  
Unrealized gain (loss) on derivative instruments (262) (3,002) (906) (3,489)  
Net unrealized gains 2,194 1,186 3,629 8,620  
Tax effect (768) (415) (1,270) (3,017)  
Other comprehensive income 1,426 771 2,359 5,603  
Unrealized gain on securities available for sale 21,514   21,514   16,978
Unrealized gain (loss) on derivative instruments (5,820)   (5,820)   (4,914)
Tax effect (5,493)   (5,493)   (4,222)
Total accumulated other comprehensive income $ 10,201   $ 10,201   $ 7,842