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Basis of Presentation (Changes from Incurred Loss Model to Expected Credit Loss Model) (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Jun. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on debt securities available for sale	$ 0		$ 0
ACL on loans	16,086	$ 17,483	16,999	$ 16,931	$ 17,017	$ 16,442
ACL			19,794
Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			16,999
ACL			16,999
Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans	2,466		2,466
ACL			2,795
Unfunded Loan Commitment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL for unfunded commitments			329
Unfunded Loan Commitment [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL for unfunded commitments			329
Residential Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans	1,333	1,264	1,288	2,913	2,740	2,175
Residential Real Estate Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			2,833
Residential Real Estate Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			(1,545)
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans	9,989	11,253	13,820	8,603	9,155	10,878
Commercial Real Estate Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			8,293
Commercial Real Estate Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			5,527
Agricultural Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			59
Agricultural Real Estate Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			259
Agricultural Real Estate Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			(200)
Construction Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans	842	819	797	319	242	133
Construction Real Estate Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			409
Construction Real Estate Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			388
Commercial Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans	1,010	1,281	1,289	2,420	2,504	1,490
Commercial Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			2,445
Commercial Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			(1,156)
Other Agricultural Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			127
Other Agricultural Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			124
Other Agricultural Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			3
Consumer Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans	$ 2,796	$ 2,725	2,085	$ 2,333	$ 2,046	$ 1,766
Consumer Loans [Member] | Pre Adoption [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			2,636
Consumer Loans [Member] | Adoption Impact [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
ACL on loans			$ (551)

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Amount of allowance for credit loss. Including debt securities, financing receivable and unfunded commitments.

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Amount of allowance for credit loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of expected credit loss for credit exposure on off-balance-sheet commitment, including but not limited to, loan commitment, standby letter of credit, financial guarantee not accounted for as insurance. Excludes off-balance sheet credit exposure accounted for as insurance and instrument accounted for under derivatives and hedging.

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