Summary of Significant Accounting Policies (Impact of ASC 326 in Loan Portfolio Segments as January 1, 2020) (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 3,007,926	$ 3,091,998		$ 3,081,973
Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	493,005	638,773	$ 534,692	589,758
Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	1,530,677	1,467,397	1,500,247	1,495,862
Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	358,150	376,186	384,654	384,526
Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	55,345	55,664	57,257
Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	222,525	219,348	225,790	225,755
Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	70,302	66,717	69,264	81,217
Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	14,357	11,637	11,953
Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 263,565	$ 256,276	305,002	304,855
Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				0
Impact of ASC 326 Adoption | Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			2,191	(57,257)
Impact of ASC 326 Adoption | Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			4,385
Impact of ASC 326 Adoption | Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			128
Impact of ASC 326 Adoption | Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			0	57,257
Impact of ASC 326 Adoption | Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			35
Impact of ASC 326 Adoption | Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			0	(11,953)
Impact of ASC 326 Adoption | Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			0	11,953
Impact of ASC 326 Adoption | Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			$ 147
Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				3,081,973
Adjusted Balance | Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				532,501
Adjusted Balance | Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				1,495,862
Adjusted Balance | Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				384,526
Adjusted Balance | Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				57,257
Adjusted Balance | Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				225,755
Adjusted Balance | Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				69,264
Adjusted Balance | Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				11,953
Adjusted Balance | Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans				$ 304,855