XML 58 R65.htm IDEA: XBRL DOCUMENT v2.4.0.6
Borrowings (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2007
Dec. 31, 2011
Short-term Debt [Line Items]      
Repurchase agreements $ 210,120,000   $ 217,177,000
Federal funds purchased 12,314,000   13,104,000
Total short-term debt 222,434,000   230,281,000
Maximum balance for repurchase agreements at any month-end 225,300,000    
Long-term debt [Abstract]      
Junior subordinated debentures, 6.52%, due 6/1/37 61,341,000   61,341,000
Maturity date of junior subordinated debentures Jun. 01, 2037    
Issuance of capital securities in a private placement   59,500,000  
Maturity period of debentures   30 years  
Period after which debentures are redeemable   5 years  
Description of variable rate basis   three-month LIBOR  
Basis spread on variable rate (in hundredths)   1.59%  
Line of Credit Facility [Line Items]      
Basis spread on variable rate (in hundredths)   1.59%  
Description of variable rate basis   three-month LIBOR  
Maturity date of line of credit Jun. 01, 2037    
Revolving Credit Promissory Note [Member]
      
Long-term debt [Abstract]      
Maturity date of junior subordinated debentures Oct. 26, 2012    
Description of variable rate basis one-month LIBOR    
Basis spread on variable rate (in hundredths) 2.25%   0.31%
Line of Credit Facility [Line Items]      
Available amount under line of credit 12,000,000    
Basis spread on variable rate (in hundredths) 2.25%   0.31%
Description of variable rate basis one-month LIBOR    
Commitment fee (in hundredths) 0.15%    
Maturity date of line of credit Oct. 26, 2012    
Subordinated debentures 9.0% [Member]
      
Long-term debt [Abstract]      
Interest rate on junior subordinated debentures (in hundredths) 9.00%    
Subordinated debentures 8.25% [Member]
      
Long-term debt [Abstract]      
Interest rate on junior subordinated debentures (in hundredths) 8.25%    
Junior subordinated debentures [Member]
      
Long-term debt [Abstract]      
Junior subordinated debentures, 6.52%, due 6/1/37 61,341,000   61,341,000
Interest rate on junior subordinated debentures (in hundredths) 1.90%    
Repurchase agreements [Member]
      
Short-term Debt [Line Items]      
Average interest rate (in hundredths) 0.53%    
Average balance of repurchase agreements $ 210,600,000    
Federal Funds Purchased [Member]
      
Short-term Debt [Line Items]      
Average interest rate (in hundredths) 0.15%