Loans and Leases and the Allowance for Loan and Lease Losses (Troubled Debt Restructuring & Narrative) (Details 6)	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Jun. 30, 2020 USD ($) contract	Jun. 30, 2019 USD ($) contract	Dec. 31, 2019 USD ($)
Information related to loans modified as a TDR
Recorded Investment	$ 65,000,000.0		$ 65,000,000.0		$ 69,100,000
Available Commitments to Lend Additional Funds on Loans Modified as TDR			$ 300,000		$ 331,300
Number of Contracts | contract	25	112	108	265
Recorded Investment (as of period end)	$ 1,509,000	$ 2,070,000	$ 2,696,000	$ 8,326,000
Increase in Allowance (as of period end)	$ 7,000	$ 36,000	$ 32,000	$ 75,000
Residential Mortgage | Maximum
Information related to loans modified as a TDR
Period of Time Loan Being Fully Amortized			40 years
Land Loan | Maximum
Information related to loans modified as a TDR
Period of Time Loan Being Fully Amortized			360 months
Extending Balloon Payments			5 years
Commercial
Information related to loans modified as a TDR
Number of Contracts | contract	1	1	3	5
Recorded Investment (as of period end)	$ 1,152,000	$ 99,000	$ 1,250,000	$ 4,041,000
Increase in Allowance (as of period end)	$ 0	$ 10,000	$ 2,000	$ 14,000
Commercial | Commercial and Industrial
Information related to loans modified as a TDR
Number of Contracts | contract	0	1	2	4
Recorded Investment (as of period end)	$ 0	$ 99,000	$ 98,000	$ 205,000
Increase in Allowance (as of period end)	$ 0	$ 10,000	$ 2,000	$ 14,000
Commercial | Commercial Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract			0	1
Recorded Investment (as of period end)			$ 0	$ 3,836,000
Increase in Allowance (as of period end)			$ 0	$ 0
Commercial | Construction
Information related to loans modified as a TDR
Number of Contracts | contract	1	0	1	0
Recorded Investment (as of period end)	$ 1,152,000	$ 0	$ 1,152,000	$ 0
Increase in Allowance (as of period end)	$ 0	$ 0	$ 0	$ 0
Consumer
Information related to loans modified as a TDR
Number of Contracts | contract	24	111	105	260
Recorded Investment (as of period end)	$ 357,000	$ 1,971,000	$ 1,446,000	$ 4,285,000
Increase in Allowance (as of period end)	$ 7,000	$ 26,000	$ 30,000	$ 61,000
Consumer | Residential Mortgage
Information related to loans modified as a TDR
Number of Contracts | contract	0	1	0	1
Recorded Investment (as of period end)	$ 0	$ 57,000	$ 0	$ 57,000
Increase in Allowance (as of period end)	$ 0	$ 0	$ 0	$ 0
Consumer | Home Equity
Information related to loans modified as a TDR
Number of Contracts | contract	0	2	0	2
Recorded Investment (as of period end)	$ 0	$ 247,000	$ 0	$ 247,000
Increase in Allowance (as of period end)	$ 0	$ 0	$ 0	$ 0
Consumer | Automobile
Information related to loans modified as a TDR
Number of Contracts | contract	19	79	70	191
Recorded Investment (as of period end)	$ 305,000	$ 1,488,000	$ 1,172,000	$ 3,596,000
Increase in Allowance (as of period end)	$ 5,000	$ 21,000	$ 19,000	$ 51,000
Consumer | Other
Information related to loans modified as a TDR
Number of Contracts | contract	5	29	35	66
Recorded Investment (as of period end)	$ 52,000	$ 179,000	$ 274,000	$ 385,000
Increase in Allowance (as of period end)	$ 2,000	$ 5,000	$ 11,000	$ 10,000