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Loans and Leases - Nonaccrual Loans (Details) - USD ($)	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	$ 41,905,000	$ 42,038,000
Nonaccrual Loans and Leases	62,544,000	62,165,000
Loans and Leases Past Due Over 89 Days and Accruing	151,000	101,000
Interest on nonaccrual loans	0
Commercial and industrial
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	400,000	0
Nonaccrual Loans and Leases	4,267,000	2,273,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial and industrial | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL		0
Nonaccrual Loans and Leases		20,000
Loans and Leases Past Due Over 89 Days and Accruing		0
Commercial and industrial | Other Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	400,000	0
Nonaccrual Loans and Leases	4,267,000	2,253,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	41,505,000	42,038,000
Nonaccrual Loans and Leases	43,235,000	44,450,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate | Agriculture
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	142,000	170,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Commercial real estate | Other Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	41,505,000	42,038,000
Nonaccrual Loans and Leases	43,093,000	44,280,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Residential Real Estate
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	14,729,000	15,172,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Residential Real Estate | Home equity
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	3,474,000	3,230,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Residential Real Estate | Mortgages
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	11,255,000	11,942,000
Loans and Leases Past Due Over 89 Days and Accruing	0	0
Consumer and other
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	313,000	270,000
Loans and Leases Past Due Over 89 Days and Accruing	151,000	101,000
Consumer and other | Other Financing Receivable
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	280,000	230,000
Loans and Leases Past Due Over 89 Days and Accruing	151,000	101,000
Consumer and other | Indirect
Accounts, Notes, Loans and Financing Receivable [Line Items]
Nonaccrual Loans and Leases with no ACL	0	0
Nonaccrual Loans and Leases	33,000	40,000
Loans and Leases Past Due Over 89 Days and Accruing	$ 0	$ 0

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