Loans (Non-accrual and Past Due Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	$ 6,048	[1]	$ 10,119	[2]
Total Non-Accrual	18,434	[1]	21,507	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Commercial and Industrial Loans
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	4,283	[1]	4,571	[2]
Total Non-Accrual	13,852	[1]	8,133	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	50	[1]	3,152	[2]
Total Non-Accrual	2,766	[1]	10,188	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Agricultural Loans
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	1,073	[1]	1,291	[2]
Total Non-Accrual	1,174	[1]	1,915	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Leases
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	0	[1]	0	[2]
Total Non-Accrual	0	[1]	0	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Home Equity Loans
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	22	[1]	271	[2]
Total Non-Accrual	22	[1]	271	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Consumer Loans
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	16	[1]	77	[2]
Total Non-Accrual	16	[1]	84	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Credit Cards
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	62	[1]	86	[2]
Total Non-Accrual	62	[1]	86	[2]
Loans Past Due Over 89 Days Still Accruing	0		0
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	542	[1]	671	[2]
Total Non-Accrual	542	[1]	830	[2]
Loans Past Due Over 89 Days Still Accruing	$ 0		$ 0

[1] Non-accrual loans with no allowance for credit loss and are also included in Total Non-Accrual loans of $18,434.

[2] Includes non-accrual loans with no allowance for credit loss and are also included in Total Non-Accrual loans of $21,507.