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Deposits - Contractual Maturities of Certificates of Deposits (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Time Deposits, Fiscal Year Maturity [Abstract]    
2013 $ 326,714  
2014 131,150  
2015 30,289  
2016 20,640  
2017 6,990  
Total $ 515,783 $ 482,411