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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 ($) | Dec. 31, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated | $ 10,022,000 | $ 7,622,000
Collectively evaluated | 1,704,060,000 | 1,596,255,000
Total | 1,714,082,000 | 1,603,877,000
Residential Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated | 940,000 | 432,000
Collectively evaluated | 329,916,000 | 316,114,000
Total | 330,856,000 | 316,546,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated | 7,197,000 | 2,211,000
Collectively evaluated | 709,678,000 | 672,945,000
Total | 716,875,000 | 675,156,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated | 63,488,000 | 63,859,000
Total | 63,488,000 | 63,859,000
Construction Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated | 53,020,000 | 51,453,000
Total | 53,020,000 | 51,453,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated | 854,000 | 4,264,000
Collectively evaluated | 211,137,000 | 196,312,000
Total | 211,991,000 | 200,576,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Collectively evaluated | 30,077,000 | 31,966,000
Total | 30,077,000 | 31,966,000
Consumer Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Individually evaluated | 1,031,000 | 715,000
Collectively evaluated | 306,744,000 | 263,606,000
Total | $ 307,775,000 | $ 264,321,000

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