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Fair Value of Financial Instruments (Reconciliation Of Fair Valued Assets Measured On A Recurring Basis) (Details) - Fair Value, Inputs, Level 3 [Member] - Fair Value, Measurements, Recurring [Member] - Collateralized debt obligations [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]        
Beginning balance $ 11,952 $ 14,872 $ 14,354 $ 15,277
Total losses realized/unrealized: Included in other comprehensive income     (1,594) (1,810)
Ending balance 12,760 13,467 $ 12,760 $ 13,467
Included in other comprehensive income (loss) $ 808 $ (1,405)