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Fair Value (Activity Under Level 3, Fair Value Measurements Using Significant Unobservable Inputs By Asset Type) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 8,778 $ 4,409 $ 15,763 $ 6,127
Total gains or (losses) (realized/unrealized) Included in earnings 60 59 119 216
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) 1,166 19 69 31
Purchases, issuances and settlements (12) (1,228) 1,928 (2,179)
Transfers in and/or (out) of Level 3 (197)   (8,084) (936)
Ending balance 9,795 3,259 9,795 3,259
Corporate Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 2,653      
Total gains or (losses) (realized/unrealized) Included in earnings 2   4  
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) (3)   (2)  
Purchases, issuances and settlements (12)   1,928  
Transfers in and/or (out) of Level 3 (682)   28  
Ending balance 1,958   1,958  
Asset-Backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance   3,672   5,299
Total gains or (losses) (realized/unrealized) Included in earnings   38   56
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)   42   75
Purchases, issuances and settlements   (752)   (1,494)
Transfers in and/or (out) of Level 3       (936)
Ending balance   3,000   3,000
Commercial Mortgage-Backed Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance     8,597  
Transfers in and/or (out) of Level 3     (8,597)  
Foreign Corporate Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance 6,125 473 7,166 481
Total gains or (losses) (realized/unrealized) Included in earnings 58 17 115 18
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss) 1,169 (20) 71 (20)
Purchases, issuances and settlements   (470)   (479)
Transfers in and/or (out) of Level 3 485   485  
Ending balance $ 7,837   $ 7,837  
Non-Agency Residential [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance   264   347
Total gains or (losses) (realized/unrealized) Included in earnings   4   142
Total gains or (losses) (realized/unrealized) Included in other comprehensive income (loss)   (3)   (24)
Purchases, issuances and settlements   (6)   (206)
Ending balance   $ 259   $ 259