Significant New Authoritative Accounting Guidance Significant New Authoritative Accounting Guidance (Narrative) (Details) $ in Thousands	Jan. 01, 2020 USD ($)
Accounting Standards Update and Change in Accounting Principle [Abstract]
Retained Earnings Adjustment Due to Adoption of ASU 2016-13	$ 6,760
Adjustment to Allowance for Loan Credit Losses Due to Adoption of ASU 2016-13	6,930
Adjustment to Allowance for Off Balance Sheet Credit Exposures Due to Adoption of ASU 2016-13	2,430
Adjustment to Deferred Taxes Due to Adoption of ASU 2016-13	2,130
Loans Identified as Purchased Credit Deteriorated	$ 9,400