Loans & Leases (Details) $ in Thousands		12 Months Ended
		Dec. 31, 2020 USD ($) Loan	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		$ 3,111,533	$ 2,680,011
Less: Unearned Income		11,941	6,984
Total Loans & Leases		3,099,592	2,673,027
Less: Allowance for Credit Losses		58,862	55,012	$ 55,266
Loans & Leases, Net		3,040,730	2,618,015
Federal Home Loan Bank [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Collateral on borrowing lines		808,900
Maximum borrowing capacity		630,500
Federal Reserve Bank [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Collateral on borrowing lines		706,200
Maximum borrowing capacity		438,100
Paycheck Protection Program [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		224,309
Loans funded for the small business customers		$ 347,400
Number of small business customers | Loan		1,540
Commercial Real Estate [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		$ 971,326	846,486
Total Loans & Leases		958,980	838,570
Less: Allowance for Credit Losses		27,679	11,053	11,609
Agricultural Real Estate [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		643,014	625,767
Total Loans & Leases		643,014	625,767
Less: Allowance for Credit Losses		8,633	15,128	14,092
Real Estate Construction [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		185,741	115,644
Total Loans & Leases		185,741	115,644
Less: Allowance for Credit Losses		1,643	1,949	1,249
Residential 1st Mortgages [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		299,379	255,253
Total Loans & Leases		299,379	255,253
Less: Allowance for Credit Losses		960	855	880
Home Equity Lines and Loans [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		34,239	39,270
Total Loans & Leases		34,239	39,270
Less: Allowance for Credit Losses		2,024	2,675	2,761
Agricultural [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		264,372	292,904
Total Loans & Leases		264,372	292,904
Less: Allowance for Credit Losses		4,814	8,076	8,242
Commercial [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		374,816	384,795
Total Loans & Leases		374,816	384,795
Less: Allowance for Credit Losses		9,961	11,466	11,656
Consumer & Other [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases	[1]	235,529	15,422
Total Loans & Leases		235,529	15,422
Less: Allowance for Credit Losses		333	456	494
Leases [Member]
Loans and Leases Receivable, Net Amount [Abstract]
Total Gross Loans & Leases		103,117	104,470
Total Loans & Leases		103,522	105,402
Less: Allowance for Credit Losses		$ 1,731	$ 3,162	$ 4,022

[1] Includes CARES Act Small Business Administration Paycheck Protection Program loans of $224,309 as of December 31, 2020.