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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] - Collateralized debt obligations [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Asset beginning balance $ 15,277 $ 14,920
Calls/maturities of investments   (996)
Included in other comprehensive (loss) income (923) 1,353
Asset ending balance $ 14,354 $ 15,277