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FAIR VALUE (Amount of Activity Pertaining to Level 3 Assets and Liabilities Included in Earnings) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Bonds    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Change in unrealized (losses) gains related to assets and liabilities held   $ (6)
Additional realized gains recognized $ 3,571  
Total net (losses) gains reported in earnings 3,571 (6)
Derivatives    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Change in unrealized (losses) gains related to assets and liabilities held (72) (99)
Change in unrealized losses related to assets and liabilities settled during the period (80)  
Additional realized gains recognized 148 645
Total net (losses) gains reported in earnings $ (4) $ 546