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Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,714,082,000 | $ 1,603,877,000
Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 171,467,000 | 134,225,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 114,199,000 | 194,063,000
Total Loans, Two Years Before Latest Fiscal Year | 167,819,000 | 146,073,000
Total Loans, Three Years Before Latest Fiscal Year | 133,394,000 | 94,987,000
Total Loans, Four Years Before Latest Fiscal Year | 81,861,000 | 93,173,000
Total Loans, Prior | 277,003,000 | 239,295,000
Revolving Loans Amortized Cost Basis | 76,688,000 | 69,741,000
Total | 1,022,431,000 | 971,557,000
Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 171,327,000 | 132,372,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 113,922,000 | 191,606,000
Total Loans, Two Years Before Latest Fiscal Year | 167,103,000 | 145,229,000
Total Loans, Three Years Before Latest Fiscal Year | 130,222,000 | 90,219,000
Total Loans, Four Years Before Latest Fiscal Year | 80,456,000 | 92,513,000
Total Loans, Prior | 265,868,000 | 229,990,000
Revolving Loans Amortized Cost Basis | 73,768,000 | 63,589,000
Total | 1,002,666,000 | 945,518,000
Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 5,000 | 1,853,000
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 1,823,000
Total Loans, Two Years Before Latest Fiscal Year | 287,000 | 502,000
Total Loans, Three Years Before Latest Fiscal Year |  | 1,650,000
Total Loans, Four Years Before Latest Fiscal Year |  | 505,000
Total Loans, Prior | 3,154,000 | 6,835,000
Revolving Loans Amortized Cost Basis | 164,000 | 2,652,000
Total | 3,610,000 | 15,820,000
Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 135,000 |
Total Loans, Fiscal Year Before Latest Fiscal Year | 277,000 | 634,000
Total Loans, Two Years Before Latest Fiscal Year | 429,000 | 342,000
Total Loans, Three Years Before Latest Fiscal Year | 3,172,000 | 3,118,000
Total Loans, Four Years Before Latest Fiscal Year | 1,405,000 | 155,000
Total Loans, Prior | 7,981,000 | 2,470,000
Revolving Loans Amortized Cost Basis | 2,756,000 | 3,500,000
Total | 16,155,000 | 10,219,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 716,875,000 | 675,156,000
Commercial Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 102,913,000 | 79,796,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 74,242,000 | 132,359,000
Total Loans, Two Years Before Latest Fiscal Year | 122,143,000 | 112,345,000
Total Loans, Three Years Before Latest Fiscal Year | 107,181,000 | 68,724,000
Total Loans, Four Years Before Latest Fiscal Year | 62,346,000 | 72,516,000
Total Loans, Prior | 226,821,000 | 194,505,000
Revolving Loans Amortized Cost Basis | 21,229,000 | 14,911,000
Total | 716,875,000 | 675,156,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year |  | 112,000
Current period gross charge-offs, Prior |  | 42,000
Current period gross charge-offs, Total |  | 154,000
Commercial Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 102,773,000 | 78,496,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 74,242,000 | 131,948,000
Total Loans, Two Years Before Latest Fiscal Year | 121,881,000 | 112,102,000
Total Loans, Three Years Before Latest Fiscal Year | 104,720,000 | 65,949,000
Total Loans, Four Years Before Latest Fiscal Year | 60,941,000 | 72,480,000
Total Loans, Prior | 217,435,000 | 186,116,000
Revolving Loans Amortized Cost Basis | 20,829,000 | 13,332,000
Total | 702,821,000 | 660,423,000
Commercial Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 5,000 | 1,300,000
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 411,000
Total Loans, Two Years Before Latest Fiscal Year | 262,000 | 243,000
Total Loans, Three Years Before Latest Fiscal Year |  | 1,331,000
Total Loans, Prior | 2,148,000 | 6,157,000
Revolving Loans Amortized Cost Basis |  | 1,579,000
Total | 2,415,000 | 11,021,000
Commercial Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 135,000 |
Total Loans, Three Years Before Latest Fiscal Year | 2,461,000 | 1,444,000
Total Loans, Four Years Before Latest Fiscal Year | 1,405,000 | 36,000
Total Loans, Prior | 7,238,000 | 2,232,000
Revolving Loans Amortized Cost Basis | 400,000 |
Total | 11,639,000 | 3,712,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 63,488,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 6,257,000 | 2,635,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,756,000 | 13,017,000
Total Loans, Two Years Before Latest Fiscal Year | 12,036,000 | 5,433,000
Total Loans, Three Years Before Latest Fiscal Year | 3,960,000 | 8,624,000
Total Loans, Four Years Before Latest Fiscal Year | 7,148,000 | 8,145,000
Total Loans, Prior | 29,811,000 | 25,333,000
Revolving Loans Amortized Cost Basis | 520,000 | 672,000
Total | 63,488,000 | 63,859,000
Agricultural Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 6,257,000 | 2,635,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,756,000 | 12,509,000
Total Loans, Two Years Before Latest Fiscal Year | 12,036,000 | 5,433,000
Total Loans, Three Years Before Latest Fiscal Year | 3,960,000 | 7,606,000
Total Loans, Four Years Before Latest Fiscal Year | 7,148,000 | 7,746,000
Total Loans, Prior | 29,038,000 | 24,654,000
Revolving Loans Amortized Cost Basis | 336,000 | 522,000
Total | 62,531,000 | 61,105,000
Agricultural Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Four Years Before Latest Fiscal Year |  | 399,000
Total Loans, Prior | 773,000 | 490,000
Revolving Loans Amortized Cost Basis | 150,000 | 150,000
Total | 923,000 | 1,039,000
Agricultural Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 508,000
Total Loans, Three Years Before Latest Fiscal Year |  | 1,018,000
Total Loans, Prior |  | 189,000
Revolving Loans Amortized Cost Basis | 34,000 |
Total | 34,000 | 1,715,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 211,991,000 | 200,576,000
Commercial Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 57,939,000 | 49,124,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 34,365,000 | 43,401,000
Total Loans, Two Years Before Latest Fiscal Year | 29,919,000 | 25,042,000
Total Loans, Three Years Before Latest Fiscal Year | 19,874,000 | 14,542,000
Total Loans, Four Years Before Latest Fiscal Year | 10,233,000 | 9,934,000
Total Loans, Prior | 15,891,000 | 15,621,000
Revolving Loans Amortized Cost Basis | 43,770,000 | 42,912,000
Total | 211,991,000 | 200,576,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year | 11,000 | 32,000
Current period gross charge-offs, Two Years Before Latest Fiscal Year |  | 24,000
Current period gross charge-offs, Three Years Before Latest Fiscal Year |  | 4,856,000
Current period gross charge-offs, Four Years Before Latest Fiscal Year | 8,000 |
Current period gross charge-offs, Prior | 51,000 | 41,000
Current period gross charge-offs, Revolving loans amortized cost basis | 30,000 |
Current period gross charge-offs, Total | 100,000 | 4,953,000
Commercial Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 57,939,000 | 48,571,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 34,088,000 | 41,863,000
Total Loans, Two Years Before Latest Fiscal Year | 29,465,000 | 24,443,000
Total Loans, Three Years Before Latest Fiscal Year | 19,163,000 | 13,752,000
Total Loans, Four Years Before Latest Fiscal Year | 10,233,000 | 9,914,000
Total Loans, Prior | 15,042,000 | 15,384,000
Revolving Loans Amortized Cost Basis | 42,906,000 | 38,644,000
Total | 208,836,000 | 192,571,000
Commercial Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year |  | 553,000
Total Loans, Fiscal Year Before Latest Fiscal Year |  | 1,412,000
Total Loans, Two Years Before Latest Fiscal Year | 25,000 | 257,000
Total Loans, Three Years Before Latest Fiscal Year |  | 134,000
Total Loans, Four Years Before Latest Fiscal Year |  | 20,000
Total Loans, Prior | 106,000 | 188,000
Revolving Loans Amortized Cost Basis | 14,000 | 768,000
Total | 145,000 | 3,332,000
Commercial Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Fiscal Year Before Latest Fiscal Year | 277,000 | 126,000
Total Loans, Two Years Before Latest Fiscal Year | 429,000 | 342,000
Total Loans, Three Years Before Latest Fiscal Year | 711,000 | 656,000
Total Loans, Prior | 743,000 | 49,000
Revolving Loans Amortized Cost Basis | 850,000 | 3,500,000
Total | 3,010,000 | 4,673,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 30,077,000 | 31,966,000
Other Agricultural Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 4,358,000 | 2,670,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,836,000 | 5,286,000
Total Loans, Two Years Before Latest Fiscal Year | 3,721,000 | 3,253,000
Total Loans, Three Years Before Latest Fiscal Year | 2,379,000 | 3,097,000
Total Loans, Four Years Before Latest Fiscal Year | 2,134,000 | 2,578,000
Total Loans, Prior | 4,480,000 | 3,836,000
Revolving Loans Amortized Cost Basis | 11,169,000 | 11,246,000
Total | 30,077,000 | 31,966,000
Other Agricultural Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 4,358,000 | 2,670,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,836,000 | 5,286,000
Total Loans, Two Years Before Latest Fiscal Year | 3,721,000 | 3,251,000
Total Loans, Three Years Before Latest Fiscal Year | 2,379,000 | 2,912,000
Total Loans, Four Years Before Latest Fiscal Year | 2,134,000 | 2,373,000
Total Loans, Prior | 4,353,000 | 3,836,000
Revolving Loans Amortized Cost Basis | 9,697,000 | 11,091,000
Total | 28,478,000 | 31,419,000
Other Agricultural Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Two Years Before Latest Fiscal Year |  | 2,000
Total Loans, Three Years Before Latest Fiscal Year |  | 185,000
Total Loans, Four Years Before Latest Fiscal Year |  | 86,000
Total Loans, Prior | 127,000 |
Revolving Loans Amortized Cost Basis |  | 155,000
Total | 127,000 | 428,000
Other Agricultural Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Four Years Before Latest Fiscal Year |  | 119,000
Revolving Loans Amortized Cost Basis | 1,472,000 |
Total | $ 1,472,000 | $ 119,000

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