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Loans (Components of Loans) (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 3,074,523		$ 3,091,998				$ 3,081,973
Less: Unearned Income	(3,833)		(3,926)
Allowance for Credit Losses	(39,995)	$ (45,099)	(46,859)	$ (42,431)	$ (36,641)	$ (31,931)	(16,278)
Loans, Net	3,030,695		3,041,213
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	591,263		638,773			534,692	589,758
Allowance for Credit Losses	(6,080)	(6,248)	(6,445)	(8,787)	(8,814)		(4,799)
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,517,172		1,467,397			1,500,247	1,495,862
Allowance for Credit Losses	(24,220)	(28,540)	(29,878)	(22,369)	(17,310)		(4,692)
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	344,450		376,186			384,654	384,526
Allowance for Credit Losses	(5,847)	(6,462)	(6,756)	(7,030)	(6,485)		(5,315)
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	56,655		55,664			57,257
Allowance for Credit Losses	(204)	(201)	(200)	(202)	(172)		0
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	213,296		219,348			225,790	225,755
Allowance for Credit Losses	(908)	(965)	(996)	(1,062)	(977)		(200)
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	64,058		66,717			69,264	81,217
Allowance for Credit Losses	(460)	(439)	(490)	(496)	(455)		(434)
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,536		11,637			11,953
Allowance for Credit Losses	(181)	(162)	(150)	(125)	(124)		0
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	274,093		256,276			$ 305,002	304,855
Allowance for Credit Losses	(2,095)	$ (2,082)	(1,944)	$ (2,360)	$ (2,304)		$ (333)
Commercial | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	591,263		638,773
Commercial | Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,517,172		1,467,397
Commercial | Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	344,450		376,186
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	56,655		55,664
Retail | Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	213,296		219,348
Retail | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	64,058		66,717
Retail | Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,536		11,637
Retail | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 274,093		$ 256,276

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