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Summary of Significant Accounting Policies (Impact of ASC 326 in Loan Portfolio Segments as January 1, 2020) (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Jan. 01, 2020	Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 3,091,998		$ 3,081,973
Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	638,773	$ 534,692	589,758
Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	1,467,397	1,500,247	1,495,862
Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	376,186	384,654	384,526
Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	55,664	57,257
Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	219,348	225,790	225,755
Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	66,717	69,264	81,217
Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	11,637	11,953
Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans	$ 256,276	305,002	304,855
Impact of ASC 326 Adoption
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			0
Impact of ASC 326 Adoption | Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		2,191	(57,257)
Impact of ASC 326 Adoption | Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		4,385
Impact of ASC 326 Adoption | Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		128
Impact of ASC 326 Adoption | Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		0	57,257
Impact of ASC 326 Adoption | Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		35
Impact of ASC 326 Adoption | Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		0	(11,953)
Impact of ASC 326 Adoption | Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		0	11,953
Impact of ASC 326 Adoption | Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans		$ 147
Adjusted Balance
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			3,081,973
Adjusted Balance | Commercial and Industrial Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			532,501
Adjusted Balance | Commercial Real Estate Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			1,495,862
Adjusted Balance | Agricultural Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			384,526
Adjusted Balance | Leases
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			57,257
Adjusted Balance | Home Equity Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			225,755
Adjusted Balance | Consumer Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			69,264
Adjusted Balance | Credit Cards
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			11,953
Adjusted Balance | Residential Mortgage Loans
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Loans			$ 304,855

X

- Definition

Amount, before allowance for credit loss and fee, of financing receivable. Excludes financing receivable covered under loss sharing agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919230-210447

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(7))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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+ References

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