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Investment Securities (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Schedule of Investments [Line Items]    
Available-for-sale securities pledged as collateral $ 136.6 $ 123.2
Collateralized debt obligations [Member]    
Schedule of Investments [Line Items]    
Impairment losses $ 3.0 $ 3.0