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Loans Receivable and Allowance for Credit Losses (Summary of Amount of Loans in Each Category that were Individually and Collectively Evaluated for Impairment) (Details) - USD ($) | Jun. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | $ 7,641,000 | $ 7,622,000
Collectively evaluated for impairment | 1,633,890,000 | 1,596,255,000
Total | 1,641,531,000 | 1,603,877,000
Residential Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 953,000 | 432,000
Collectively evaluated for impairment | 316,554,000 | 316,114,000
Total | 317,507,000 | 316,546,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 5,780,000 | 2,211,000
Collectively evaluated for impairment | 679,432,000 | 672,945,000
Total | 685,212,000 | 675,156,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 60,963,000 | 63,859,000
Total | 60,963,000 | 63,859,000
Construction Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 48,030,000 | 51,453,000
Total | 48,030,000 | 51,453,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 108,000 | 4,264,000
Collectively evaluated for impairment | 208,550,000 | 196,312,000
Total | 208,658,000 | 200,576,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated for impairment | 31,281,000 | 31,966,000
Total | 31,281,000 | 31,966,000
Consumer Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated for impairment | 800,000 | 715,000
Collectively evaluated for impairment | 289,080,000 | 263,606,000
Total | $ 289,880,000 | $ 264,321,000

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