Loans (Non-accrual and Past Due Loans) (Details) - USD ($) $ in Thousands	Mar. 31, 2021		Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Non-accrual With No Allowance For Credit Loss	$ 9,461	[1]	$ 10,119	[2]
Non-Accrual	20,994		21,507
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	4,061	[1]	4,571	[2]
Non-Accrual	7,312		8,133
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	3,144	[1]	3,152	[2]
Non-Accrual	10,133		10,188
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	1,220	[1]	1,291	[2]
Non-Accrual	1,841		1,915
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]
Non-Accrual	0		0
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	293	[1]	271	[2]
Non-Accrual	293		271
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	109	[1]	77	[2]
Non-Accrual	112		84
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	154	[1]	86	[2]
Non-Accrual	154		86
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	480	[1]	671	[2]
Non-Accrual	1,149		830
Loans Past Due Over 89 Days Still Accruing	$ 0		$ 0

[1] Includes non-accrual loans with no allowance for credit loss and are also included in Non-Accrual loans totaling $20,994.

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