Loans & Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	$ 2,001,487	$ 1,715,657
Less: Unearned Income	5,128	3,413
Total Loans & Leases	1,996,359	1,712,244
Less: Allowance for Credit Losses	41,523	35,401
Loans & Leases, Net	1,954,836	1,676,843
Collateral on borrowing lines	588,300
Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	609,602	495,316
Total Loans & Leases	603,650	491,903
Agricultural Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	424,034	357,207
Total Loans & Leases	424,034	357,207
Real Estate Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	151,974	96,519
Total Loans & Leases	151,974	96,519
Residential 1st Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	206,405	171,880
Total Loans & Leases	206,405	171,880
Home Equity Lines and Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	33,056	33,017
Total Loans & Leases	33,056	33,017
Agricultural [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	293,966	281,963
Total Loans & Leases	293,966	281,963
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	210,804	230,819
Total Loans & Leases	210,804	230,819
Consumer & Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	6,592	4,719
Total Loans & Leases	6,592	4,719
Unallocated [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Loans & Leases	0	0
Leases [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Loans & Leases	65,054	44,217
Total Loans & Leases	65,878	$ 44,217
Federal Home Loan Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral on borrowing lines	588,300
Maximum borrowing capacity	500,400
Federal Reserve Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Collateral on borrowing lines	595,900
Maximum borrowing capacity	$ 365,600