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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Details 3) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Available for sale states and political subdivisions debt securities
   
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis    
Aggregate fair value / Balance at the beginning of the period $ 12,826 $ 12,994
Principal payments received (100) (95)
Unrealized net gain included in other comprehensive income (86) 334
Purchases, sales, issuances and settlements, net 73  
Aggregate fair value / Balance at the end of the period 12,713 13,233
Mortgage revenue bonds
   
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis    
Aggregate fair value / Balance at the end of the period $ 12,700  
Additional disclosures    
Number of investment securities held 5  
Mortgage revenue bonds | Weighted average
   
Additional disclosures    
Discount rate (as a percent) 4.51%