Loans - Components of Loans (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 3,772,866	$ 3,788,645
Less: Unearned Income	(3,994)	(3,711)
Allowance for Credit Losses	(44,315)	(44,168)	$ (45,078)	$ (37,017)
Loans, Net	3,724,557	3,740,766
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	608,870	620,106
Allowance for Credit Losses	(13,572)	(13,749)	(12,720)	(9,554)
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,000,237	1,966,884
Allowance for Credit Losses	(22,062)	(21,598)	(23,217)	(19,245)
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	378,587	417,413
Allowance for Credit Losses	(3,887)	(4,188)	(4,759)	(4,505)
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	58,436	56,396
Allowance for Credit Losses	(227)	(209)	(196)	(200)
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	277,576	279,748
Allowance for Credit Losses	(1,415)	(1,344)	(1,207)	(1,061)
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	80,502	79,904
Allowance for Credit Losses	(609)	(595)	(616)	(507)
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	18,320	17,512
Allowance for Credit Losses	(263)	(257)	(212)	(240)
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	350,338	350,682
Allowance for Credit Losses	(2,280)	(2,228)	$ (2,151)	$ (1,705)
Commercial: | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	608,870	620,106
Commercial: | Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,000,237	1,966,884
Commercial: | Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	378,587	417,413
Commercial: | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	58,436	56,396
Retail: | Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	277,576	279,748
Retail: | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	80,502	79,904
Retail: | Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	18,320	17,512
Retail: | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 350,338	$ 350,682