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Investments (Narrative) (Details)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
item
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 286,217 $ 187,433
Number of temporarily impaired securities | item 85 144
Temporarily impaired fair value $ 73,400  
Unrealized Losses 1,594 $ 1,686
Unrealized Gain (Loss) on Securities   (92)
Restricted stock 468 465
Equity securities 340 440
Public Funds And Trust Deposits [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value $ 91,800 $ 107,100