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Consolidated balance sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Interest-bearing deposits in banks, pledged deposits $ 23,994 $ 16,075
Trading assets, pledged securities to creditors 18,988 34,208
Securities available-for-sale, pledged securities to creditors 375,492 235,581
Securities held-to-maturity, fair value 26,637 33,206
Securities held-to-maturity, pledged securities to creditors 17,486 13,018
Premises and equipment, accumulated depreciation and amortization $ 17,881 $ 16,640
Class A common stock
    
Common stock, no par value      
Common stock, assigned value $ 6.67 $ 6.67
Common stock, Authorized 40,000,000 40,000,000
Common stock, outstanding 6,342,189 6,342,189
Class B common stock
    
Common stock, no par value      
Common stock, assigned value $ 6.67 $ 6.67
Common stock, Authorized 40,000,000 40,000,000
Common stock, outstanding 2,531,926 2,542,021
Class E common stock
    
Common stock, no par value      
Common stock, assigned value $ 6.67 $ 6.67
Common stock, Authorized 100,000,000 100,000,000
Common stock, outstanding 28,257,827 27,826,330