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Fair Value Of Financial Instruments (Schedule Of Changes In Fair Value Associated With Level 3 Financial Instruments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Non-Agency [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance   $ 1
Realized gains/(losses)   (1)
Net change   (1)
Asset-Backed Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance $ 175 175
Unrealized gains/(losses), Included in changes in net assets   2
Redemptions   (2)
Ending Balance 175 175
Loans [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Purchases 17,335 17,335
Transfers, Into Level 3 465 465
Net change 17,800 17,800
Ending Balance 17,800 17,800
Corporate Equity Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Transfers, Into Level 3 1,060 1,060
Net change 1,060 1,060
Ending Balance 1,060 1,060
Equity Auction Rate Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 16,732 16,632
Unrealized gains/(losses), Included in changes in net assets (418) (318)
Redemptions (2,650) (2,650)
Net change (3,068) (2,968)
Ending Balance 13,664 13,664
Auction Rate Municipal Securities [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 184 704
Redemptions   (50)
Transfers, Out of Level 3   (470)
Net change   (520)
Ending Balance 184 184
Other Investment [Member]    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Beginning Balance 853 857
Redemptions   (4)
Net change   (4)
Ending Balance $ 853 $ 853