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Fair Value (Reconciliation Of Level 3 Input For Financial Instruments Measured On Recurring Basis) (Details) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
U S Government Sponsored Entities Asset Backed Securities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Investments, Fair Value Disclosure   $ 938,381     $ 1,003,421    
Equity Securities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Investments, Fair Value Disclosure   1,889     1,649    
Fair Value, Inputs, Level 2 [Member] | U S Government Sponsored Entities Asset Backed Securities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Investments, Fair Value Disclosure   938,381     1,003,421    
Fair Value, Inputs, Level 3 [Member] | Equity Securities [Member]              
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Investments, Fair Value Disclosure   438     424    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning $ 424 438 $ 424 $ 433 424 $ 420 $ 417
Included in other comprehensive income   14 7        
Balance, ending 424 438 424 433 424 420 417
Fair Value, Inputs, Level 3 [Member] | Swap [Member]              
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]              
Balance, beginning (226) (226) (226) (226) (226) (226) (226)
Included in other comprehensive income 0 0 0        
Balance, ending $ (226) $ (226) $ (226) $ (226) $ (226) $ (226) $ (226)