Short-Term Borrowings (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2017
Short-term Debt [Line Items]
Carrying value of the underlying qualified investment securities		$ 12.2
FHLB Advance [Member]
Short-term Debt [Line Items]
Remaining borrowing capacity	$ 202.8
Correspondent Banks [Member]
Short-term Debt [Line Items]
Remaining borrowing capacity	21.0
Federal Reserve Bank Discount Window [Member]
Short-term Debt [Line Items]
Remaining borrowing capacity	$ 94.3