Loans - Components of Loans (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 4,044,268		$ 3,977,900
Less: Unearned Income	(7,141)		(6,818)
Allowance for Credit Losses	(43,946)	$ (43,754)	(43,765)	$ (44,266)	$ (44,315)	$ (44,168)
Loans, Net	3,993,181		3,927,317
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	591,699		589,541
Allowance for Credit Losses	(7,200)	(7,266)	(7,921)	(13,567)	(13,572)	(13,749)
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,172,447		2,121,835
Allowance for Credit Losses	(26,598)	(26,452)	(25,923)	(21,834)	(22,062)	(21,598)
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	413,742		423,803
Allowance for Credit Losses	(3,697)	(3,650)	(3,837)	(3,956)	(3,887)	(4,188)
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	72,736		71,988
Allowance for Credit Losses	(368)	(373)	(346)	(235)	(227)	(209)
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	322,043		299,685
Allowance for Credit Losses	(2,058)	(2,001)	(1,834)	(1,436)	(1,415)	(1,344)
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	81,171		87,853
Allowance for Credit Losses	(722)	(785)	(759)	(640)	(609)	(595)
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	21,433		20,351
Allowance for Credit Losses	(413)	(395)	(383)	(288)	(263)	(257)
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	368,997		362,844
Allowance for Credit Losses	(2,890)	$ (2,832)	(2,762)	$ (2,310)	$ (2,280)	$ (2,228)
Commercial: | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	591,699		589,541
Commercial: | Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	2,172,447		2,121,835
Commercial: | Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	413,742		423,803
Commercial: | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	72,736		71,988
Retail: | Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	322,043		299,685
Retail: | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	81,171		87,853
Retail: | Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	21,433		20,351
Retail: | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans	$ 368,997		$ 362,844