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Loans and Leases - Nonaccrual Loans (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	$ 24,212,000	$ 24,212,000
Nonaccrual	26,944,000	26,944,000	$ 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	1,469,000	1,469,000
Nonaccrual	1,636,000	1,636,000	2,335,000
Loans Past Due Over 89 Days and Accruing	0	0	2,000
Commercial and industrial | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	1,469,000	1,469,000
Nonaccrual	1,636,000	1,636,000	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	10,212,000	10,212,000
Nonaccrual	12,777,000	12,777,000	10,789,000
Loans Past Due Over 89 Days and Accruing	0	0	542,000
Commercial real estate | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	10,092,000	10,092,000
Nonaccrual	12,657,000	12,657,000	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	120,000	120,000
Nonaccrual	120,000	120,000	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	12,203,000	12,203,000
Nonaccrual	12,203,000	12,203,000	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	2,793,000	2,793,000
Nonaccrual	2,793,000	2,793,000	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	9,410,000	9,410,000
Nonaccrual	9,410,000	9,410,000	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	328,000	328,000
Nonaccrual	328,000	328,000	275,000
Loans Past Due Over 89 Days and Accruing	0	0	0
Consumer and other | Other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans with no Allowance for Credit Losses	184,000	184,000
Nonaccrual	184,000	184,000	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	144,000	144,000
Nonaccrual	144,000	144,000	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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