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Equity Securities Without Readily Determinable Fair Values (Equity securities without readily determinable fair values) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Equity Method And Other Investments [Abstract]    
FHLB Stock $ 15,050 $ 15,050
FRB Stock 1,999 1,999
Other 334 334
Total 25,130 24,948
Investment in Corporate Settlement Solutions [Member]    
Schedule of Equity Method Investments [Line Items]    
Equity method investments $ 7,747 $ 7,565