Short-Term Borrowings (Narrative) (Details) $ in Millions	Dec. 31, 2020 USD ($)
FHLB Advance [Member]
Short-term Debt [Line Items]
Remaining borrowing capacity	$ 428.7
Correspondent Banks [Member]
Short-term Debt [Line Items]
Remaining borrowing capacity	31.0
Federal Reserve Bank Discount Window [Member]
Short-term Debt [Line Items]
Remaining borrowing capacity	$ 91.0

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant