Loans (Non-accrual and Loans Past Due over 89 Days Still Accruing) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Financing Receivable, Past Due [Line Items]
Non-Accrual With No Allowance For Credit Losses	[1]	$ 10,119
Non-Accrual		21,507	$ 13,802
Loans Past Due Over 89 Days Still Accruing		0	190
Commercial and Industrial Loans
Financing Receivable, Past Due [Line Items]
Non-Accrual With No Allowance For Credit Losses	[1]	4,571
Non-Accrual		8,133
Loans Past Due Over 89 Days Still Accruing		0
Commercial Real Estate Loans
Financing Receivable, Past Due [Line Items]
Non-Accrual With No Allowance For Credit Losses	[1]	3,152
Non-Accrual		10,188	3,433
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 Losses	[1]	1,291
Non-Accrual		1,915	2,739
Loans Past Due Over 89 Days Still Accruing		0	0
Leases
Financing Receivable, Past Due [Line Items]
Non-Accrual With No Allowance For Credit Losses	[1]	0
Non-Accrual		0
Loans Past Due Over 89 Days Still Accruing		0
Home Equity Loans
Financing Receivable, Past Due [Line Items]
Non-Accrual With No Allowance For Credit Losses	[1]	271
Non-Accrual		271	79
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 Losses	[1]	77
Non-Accrual		84	115
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 Losses	[1]	86
Non-Accrual		86
Loans Past Due Over 89 Days Still Accruing		0
Residential Mortgage Loans
Financing Receivable, Past Due [Line Items]
Non-Accrual With No Allowance For Credit Losses	[1]	671
Non-Accrual		830	2,496
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 $21,507