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Loans and Leases - Nonaccrual Loans (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	$ 22,268,000	$ 22,268,000
Nonaccrual	23,183,000	23,183,000	$ 24,281,000
Loans Past Due Over 89 Days and Accruing	0	0	794,000
Interest on nonaccrual loans	0	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	1,877,000	1,877,000
Nonaccrual	2,014,000	2,014,000	2,335,000
Loans Past Due Over 89 Days and Accruing	0	0	2,000
Commercial and industrial | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	1,877,000	1,877,000
Nonaccrual	2,014,000	2,014,000	2,335,000
Loans Past Due Over 89 Days and Accruing	0	0	2,000
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual			0
Loans Past Due Over 89 Days and Accruing			0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	8,439,000	8,439,000
Nonaccrual	9,217,000	9,217,000	10,789,000
Loans Past Due Over 89 Days and Accruing	0	0	542,000
Commercial real estate | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	6,880,000	6,880,000
Nonaccrual	9,094,000	9,094,000	10,789,000
Loans Past Due Over 89 Days and Accruing	0	0	542,000
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	1,559,000	1,559,000
Nonaccrual	123,000	123,000	0
Loans Past Due Over 89 Days and Accruing	0	0	0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	11,555,000	11,555,000
Nonaccrual	11,555,000	11,555,000	10,882,000
Loans Past Due Over 89 Days and Accruing	0	0	250,000
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	2,279,000	2,279,000
Nonaccrual	2,279,000	2,279,000	2,796,000
Loans Past Due Over 89 Days and Accruing	0	0	55,000
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	9,276,000	9,276,000
Nonaccrual	9,276,000	9,276,000	8,086,000
Loans Past Due Over 89 Days and Accruing	0	0	195,000
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	397,000	397,000
Nonaccrual	397,000	397,000	275,000
Loans Past Due Over 89 Days and Accruing	0	0	0
Consumer and other | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	203,000	203,000
Nonaccrual	203,000	203,000	158,000
Loans Past Due Over 89 Days and Accruing	0	0	0
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	194,000	194,000
Nonaccrual	194,000	194,000	117,000
Loans Past Due Over 89 Days and Accruing	0	0	0
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	0	0
Nonaccrual	0	0	0
Loans Past Due Over 89 Days and Accruing	$ 0	$ 0	$ 0

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