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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3)
$ in Thousands
9 Months Ended
Sep. 30, 2015
USD ($)
security
Sep. 30, 2014
USD ($)
States and political subdivisions    
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 $ 13,095 $ 10,518
Principal payments received (897) (202)
Unrealized net gain included in other comprehensive income 554 74
Purchases   2,325
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 $ 12,752 $ 12,715
Additional disclosures    
Number of investment securities held | security 4  
Mortgage revenue bonds | Weighted average    
Additional disclosures    
Discount rate (as a percent) 3.90%