XML 59 R49.htm IDEA: XBRL DOCUMENT v3.20.2
Investment Securities - Investments in Debt and Equity Securities Reported Less than Historical Cost (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Schedule of Investments [Line Items]    
Fair value $ 51,815 $ 395,416
Investments reported at less than historical cost    
Schedule of Investments [Line Items]    
Historical cost 52,054 398,172
Fair value 51,815 395,416
Gross unrealized losses $ 239 $ 2,756
Percent of the Corporation's investment portfolio 1.90% 15.20%