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Loans - Amortized Cost Basis of Collateral-Dependent Nonaccrual Loans and Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Loans [Abstract]
Financing Receivable, Nonaccrual	$ 20,524	$ 25,701
Real Estate Loans [Member] | Mortgages [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	3,961	2,706
Real Estate Loans [Member] | Home Equity [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	62	165
Real Estate Loans [Member] | Commercial [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	9,511	14,364
Real Estate Loans [Member] | Agricultural [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	2,151	4,062
Real Estate Loans [Member] | Construction [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	1,552	283
Consumer [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	778	1,002
Other Commercial Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	2,106	2,582
Other Agricultural Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	403	537
Real Estate [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	17,237	21,580
Real Estate [Member] | Real Estate Loans [Member] | Mortgages [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	3,961	2,706
Real Estate [Member] | Real Estate Loans [Member] | Home Equity [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	62	165
Real Estate [Member] | Real Estate Loans [Member] | Commercial [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	9,511	14,364
Real Estate [Member] | Real Estate Loans [Member] | Agricultural [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	2,151	4,062
Real Estate [Member] | Real Estate Loans [Member] | Construction [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	1,552	283
Real Estate [Member] | Consumer [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Real Estate [Member] | Other Commercial Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Real Estate [Member] | Other Agricultural Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	2,509	3,119
Business Assets [Member] | Real Estate Loans [Member] | Mortgages [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member] | Real Estate Loans [Member] | Home Equity [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member] | Real Estate Loans [Member] | Commercial [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member] | Real Estate Loans [Member] | Agricultural [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member] | Real Estate Loans [Member] | Construction [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member] | Consumer [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
Business Assets [Member] | Other Commercial Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	2,106	2,582
Business Assets [Member] | Other Agricultural Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	403	537
None [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	778	1,002
None [Member] | Real Estate Loans [Member] | Mortgages [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Real Estate Loans [Member] | Home Equity [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Real Estate Loans [Member] | Commercial [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Real Estate Loans [Member] | Agricultural [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Real Estate Loans [Member] | Construction [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Consumer [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	778	1,002
None [Member] | Other Commercial Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	0	0
None [Member] | Other Agricultural Loans [Member]
Loans [Abstract]
Financing Receivable, Nonaccrual	$ 0	$ 0

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 310
-SubTopic 20
-Name Accounting Standards Codification
-Section 40
-Paragraph 7
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481628/310-20-40-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481990/310-10-45-2

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+ References

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
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-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
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-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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