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Borrowings (Details Textual) (USD $)
 6 Months Ended
Jun. 30, 2012
Dec. 31, 2011
Jun. 30, 2012
Retail overnight and term repurchase agreements [Member]
Dec. 31, 2011
Retail overnight and term repurchase agreements [Member]
Jun. 30, 2012
Wholesale repurchase agreements [Member]
Dec. 31, 2011
Wholesale repurchase agreements [Member]
Jun. 30, 2012
Convertible and callable advances [Member]
Dec. 31, 2011
Convertible and callable advances [Member]
Jun. 30, 2011
Convertible and callable advances [Member]
Borrowings (Textual) [Abstract]                  
Securities sold under agreements to repurchase $ 148,367,000 $ 129,208,000 $ 90,170,000 $ 79,210,000 $ 58,200,000 $ 50,000,000      
Weighted average contractual rate of the wholesale repurchase agreements         3.37% 3.65% 3.55% 4.12%  
Convertible and callable advances 176,653,000 150,000,000           150,000,000 164,320,000
Minimum contractual maturities period 2 months                
Maximum contractual maturities period 9 years                
Borrowings (Additional Textual) [Abstract]                  
Qualifying loans 1,040,000,000 693,330,000              
Unused borrowing capacity 278,890,000                
Junior subordinated debentures issued 15,460,000                
fixed rate credit $ 12,330,000                
Libor rate 2.95%                
Time period of LIBOR interest rate 3 months