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Fair Value (Details 5) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Carrying amount and estimated fair value of financial instruments        
Securities available for sale $ 658,751   $ 666,287  
Restricted Stock 21,296   22,282  
FDIC Indemnification asset 1,608 1,802 2,384 3,977
Accrued interest receivable 11,829   12,947  
Deposits (2,253,221)   (2,274,499)  
Other borrowings (146,111)   (146,427)  
Level 1
       
Carrying amount and estimated fair value of financial instruments        
Cash and due from banks 18,484      
Securities available for sale 320   375  
Level 2
       
Carrying amount and estimated fair value of financial instruments        
Cash and due from banks 66,185      
Federal funds sold 27,472      
Securities available for sale 643,986   649,905  
FDIC Indemnification asset 1,608      
Accrued interest receivable 3,087      
Deposits (2,258,753)      
Short-term borrowings (47,091)      
Federal Home Loan Bank advances (147,351)      
Other borrowings (6,098)      
Accrued interest payable (1,299)      
Level 3
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 7,163   4,964  
Securities available for sale 14,445   16,007  
Loans, net 1,953,612      
Accrued interest receivable 8,742      
Level 3 | Other real estate
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 7,163   4,964  
Level 3 | Other real estate - commercial
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 4,763   2,080  
Level 3 | Other real estate - residential
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 2,400   2,884  
Carrying Value
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 7,163   4,964  
Cash and due from banks 84,669   134,280  
Federal funds sold 27,472   11,725  
Securities available for sale 658,751   666,287  
Restricted Stock 21,296   22,282  
Loans, net 1,857,631   1,874,438  
FDIC Indemnification asset 1,608   2,384  
Accrued interest receivable 11,829   12,947  
Deposits (2,253,221)   (2,274,499)  
Short-term borrowings (47,091)   (100,022)  
Federal Home Loan Bank advances (140,013)   (140,231)  
Other borrowings (6,098)   (6,196)  
Accrued interest payable (1,299)   (1,829)  
Carrying Value | Other real estate - commercial
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 4,763   2,080  
Carrying Value | Other real estate - residential
       
Carrying amount and estimated fair value of financial instruments        
Total fair value 2,400   2,884  
Fair Value
       
Carrying amount and estimated fair value of financial instruments        
Cash and due from banks 84,669   134,280  
Federal funds sold 27,472   11,725  
Securities available for sale 658,751   666,287  
Loans, net 1,953,612   1,888,263  
FDIC Indemnification asset 1,608   2,384  
Accrued interest receivable 11,829   12,947  
Deposits (2,258,753)   (2,279,739)  
Short-term borrowings (47,091)   (100,022)  
Federal Home Loan Bank advances (147,351)   (144,089)  
Other borrowings (6,098)   (6,196)  
Accrued interest payable $ (1,299)   $ (1,829)