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Loans (Classifications of Loans) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 3,091,998		$ 3,081,973
Less:    Unearned Income	(3,926)		(4,882)
Allowance for Credit Losses	(46,859)	$ (31,931)	(16,278)	$ (15,823)	$ (15,694)
Loans, Net	3,041,213		3,060,813
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	638,773	534,692	589,758
Allowance for Credit Losses	(6,445)		(4,799)
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,467,397	1,500,247	1,495,862
Allowance for Credit Losses	(29,878)		(4,692)	(5,291)	(4,591)
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	376,186	384,654	384,526
Allowance for Credit Losses	(6,756)		(5,315)	(5,776)	(4,894)
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	55,664	57,257
Allowance for Credit Losses	(200)		0
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	219,348	225,790	225,755
Allowance for Credit Losses	(996)		(200)	(229)	(330)
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	66,717	69,264	81,217
Allowance for Credit Losses	(490)		(434)	(420)	(298)
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,637	11,953
Allowance for Credit Losses	(150)		0
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	256,276	$ 305,002	304,855
Allowance for Credit Losses	(1,944)		(333)	$ (472)	$ (343)
Commercial | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	638,773		532,501
Commercial | Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	1,467,397		1,495,862
Commercial | Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	376,186		384,526
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	55,664		57,257
Retail
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	3,091,998		3,081,973
Retail | Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	219,348		225,755
Retail | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	66,717		69,264
Retail | Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	11,637		11,953
Retail | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans	$ 256,276		$ 304,855

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