Loans And Allowance for Credit Losses (Collateral-Dependent Loans) (Details) - Commercial Portfolio Segment [Member] $ in Thousands	Jun. 30, 2020 USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	$ 19,058
Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	18,518
Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business Real Estate, Amortized Cost	540
Business Assets
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	144
Business Assets | Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	144
Business Assets | Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business Real Estate, Amortized Cost	0
Future Revenue Streams
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	3,701
Future Revenue Streams | Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	3,701
Future Revenue Streams | Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business Real Estate, Amortized Cost	0
Real Estate
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	540
Real Estate | Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	0
Real Estate | Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business Real Estate, Amortized Cost	540
Energy Service
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Amortized Cost	14,673
Energy Service | Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business, Amortized Cost	14,673
Energy Service | Real Estate - Business [Member]
Financing Receivable, Credit Quality Indicator [Line Items]
Collateral Dependent Loans, Business Real Estate, Amortized Cost	$ 0