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FAIR VALUE OF ASSETS AND LIABILITIES (Level 3 Assets and Liabilities) (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
bond
Dec. 31, 2015
USD ($)
States and political subdivisions    
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis    
Principal payments received $ (338) $ (987)
Purchases 0 0
Unrealized net loss included in other comprehensive loss 55 371
Mortgage revenue bonds    
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 12,479 13,095
Aggregate fair value / Balance at the end of the period $ 12,196 $ 12,479
Additional disclosures    
Number of investment securities held | bond 4  
Mortgage revenue bonds | Weighted average    
Additional disclosures    
Discount rate 3.00%