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Loans (Components of Loans) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Jan. 01, 2020	Dec. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 3,012,989		$ 3,091,998				$ 3,081,973
Less: Unearned Income	(3,729)		(3,926)
Allowance for Credit Losses	(37,798)	$ (39,995)	(46,859)	$ (46,768)	$ (42,431)	$ (31,931)	(16,278)
Loans, Net	2,971,462		3,041,213
Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	510,583		638,773			534,692	589,758
Allowance for Credit Losses	(8,054)	(6,080)	(6,445)	(7,700)	(8,787)		(4,799)
Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,528,493		1,467,397			1,500,247	1,495,862
Allowance for Credit Losses	(21,392)	(24,220)	(29,878)	(28,382)	(22,369)		(4,692)
Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	349,321		376,186			384,654	384,526
Allowance for Credit Losses	(4,695)	(5,847)	(6,756)	(6,715)	(7,030)		(5,315)
Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	56,186		55,664			57,257
Allowance for Credit Losses	(203)	(204)	(200)	(206)	(202)		0
Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	217,994		219,348			225,790	225,755
Allowance for Credit Losses	(1,017)	(908)	(996)	(995)	(1,062)		(200)
Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	67,150		66,717			69,264	81,217
Allowance for Credit Losses	(483)	(460)	(490)	(492)	(496)		(434)
Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,856		11,637			11,953
Allowance for Credit Losses	(192)	(181)	(150)	(137)	(125)		0
Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	269,406		256,276			$ 305,002	304,855
Allowance for Credit Losses	(1,762)	$ (2,095)	(1,944)	$ (2,141)	$ (2,360)		$ (333)
Commercial | Commercial and Industrial Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	510,583		638,773
Commercial | Commercial Real Estate Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	1,528,493		1,467,397
Commercial | Agricultural Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	349,321		376,186
Commercial | Leases
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	56,186		55,664
Retail | Home Equity Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	217,994		219,348
Retail | Consumer Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	67,150		66,717
Retail | Credit Cards
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	13,856		11,637
Retail | Residential Mortgage Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total	$ 269,406		$ 256,276

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