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Loans and Leases - Nonaccrual Loans (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	$ 27,859,000		$ 27,859,000		$ 26,018,000
Total Loans	48,019,000		48,019,000		38,976,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Interest on nonaccrual loans	0	$ 0	0	$ 0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	171,000		171,000		803,000
Total Loans	708,000		708,000		1,775,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Commercial and industrial | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	171,000		171,000		803,000
Total Loans	708,000		708,000		1,775,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	25,948,000		25,948,000		23,080,000
Total Loans	35,401,000		35,401,000		23,627,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	1,041,000		1,041,000		0
Total Loans	1,154,000		1,154,000		118,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Commercial real estate | Commercial and industrial other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	24,907,000		24,907,000		23,080,000
Total Loans	34,247,000		34,247,000		23,509,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Residential real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	1,737,000		1,737,000		2,132,000
Total Loans	11,556,000		11,556,000		13,145,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Residential real estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	707,000		707,000		767,000
Total Loans	2,534,000		2,534,000		2,965,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Residential real estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	1,030,000		1,030,000		1,365,000
Total Loans	9,022,000		9,022,000		10,180,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	3,000		3,000		3,000
Total Loans	354,000		354,000		429,000
Loans and Leases 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 and Leases with no Allowance for Credit Losses	0		0		0
Total Loans	128,000		128,000		260,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	3,000		3,000		3,000
Total Loans	226,000		226,000		169,000
Loans and Leases Past Due Over 89 Days and Accruing	0		0		0
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no Allowance for Credit Losses	0		0		0
Total Loans	0		0		0
Loans and Leases Past Due Over 89 Days and Accruing	$ 0		$ 0		$ 0

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