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Investment Securities At Fair Value (Gross Realized Gains and Losses on Investment Securities) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]      
Gross realized gains on sales $ 144 $ 4  
Gross realized gains on sales     $ 479
Gross realized losses on sales (9) (38)  
Gross realized losses on sales     (310)
Net gains (losses) recognized on debt and equity securities available for sale 135 (34)  
Net gains (losses) recognized on debt and equity securities available for sale     169
Gross realized losses on other-than-temporary impairments (15) (1,087) $ (465)
Equity securities at fair value 46,196 47,202  
Net losses recognized on investment securities 7,320 (8,449)  
Net losses recognized equity securities 1,526 (808)  
Net unrealized gains (losses) recognized on equity securities still held at the reporting date 5,794 (7,641)  
Net losses recognized on equity securities at fair value that qualify for the NAV practical expedient 6,619 (517)  
Long-term investments      
Debt Securities, Available-for-sale [Line Items]      
Net losses recognized on equity securities at fair value that qualify for the NAV practical expedient 1,797 84  
Marketable equity securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Debt Securities, Available-for-sale [Line Items]      
Equity securities at fair value 23,819 26,010  
Mutual funds invested in fixed income securities | Quoted Prices in Active Markets for Identical Assets (Level 1)      
Debt Securities, Available-for-sale [Line Items]      
Equity securities at fair value $ 22,377 $ 21,192