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Loans Receivable and Allowance for Credit Losses (Summary of Recorded Investment by Internal Risk Rating Systems) (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2025 | Dec. 31, 2024
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | $ 1,815,138,000 | $ 1,714,082,000
Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 145,226,000 | 171,467,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 151,972,000 | 114,199,000
Total Loans, Two Years Before Latest Fiscal Year | 101,436,000 | 167,819,000
Total Loans, Three Years Before Latest Fiscal Year | 155,889,000 | 133,394,000
Total Loans, Four Years Before Latest Fiscal Year | 112,928,000 | 81,861,000
Total Loans, Prior | 310,853,000 | 277,003,000
Revolving Loans Amortized Cost Basis | 69,629,000 | 76,688,000
Total | 1,047,933,000 | 1,022,431,000
Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 145,037,000 | 171,327,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 150,602,000 | 113,922,000
Total Loans, Two Years Before Latest Fiscal Year | 101,177,000 | 167,103,000
Total Loans, Three Years Before Latest Fiscal Year | 155,327,000 | 130,222,000
Total Loans, Four Years Before Latest Fiscal Year | 107,858,000 | 80,456,000
Total Loans, Prior | 299,058,000 | 265,868,000
Revolving Loans Amortized Cost Basis | 65,933,000 | 73,768,000
Total | 1,024,992,000 | 1,002,666,000
Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 189,000 | 5,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 1,235,000 |
Total Loans, Two Years Before Latest Fiscal Year |  | 287,000
Total Loans, Three Years Before Latest Fiscal Year | 228,000 |
Total Loans, Four Years Before Latest Fiscal Year | 2,036,000 |
Total Loans, Prior | 3,570,000 | 3,154,000
Revolving Loans Amortized Cost Basis | 814,000 | 164,000
Total | 8,072,000 | 3,610,000
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 | 135,000 | 277,000
Total Loans, Two Years Before Latest Fiscal Year | 259,000 | 429,000
Total Loans, Three Years Before Latest Fiscal Year | 334,000 | 3,172,000
Total Loans, Four Years Before Latest Fiscal Year | 3,034,000 | 1,405,000
Total Loans, Prior | 8,225,000 | 7,981,000
Revolving Loans Amortized Cost Basis | 2,882,000 | 2,756,000
Total | 14,869,000 | 16,155,000
Commercial Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 737,533,000 | 716,875,000
Commercial Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 87,169,000 | 102,913,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 99,816,000 | 74,242,000
Total Loans, Two Years Before Latest Fiscal Year | 69,980,000 | 122,143,000
Total Loans, Three Years Before Latest Fiscal Year | 116,321,000 | 107,181,000
Total Loans, Four Years Before Latest Fiscal Year | 92,705,000 | 62,346,000
Total Loans, Prior | 252,397,000 | 226,821,000
Revolving Loans Amortized Cost Basis | 19,145,000 | 21,229,000
Total | 737,533,000 | 716,875,000
Current period gross charge-offs, Prior | 62,000 |
Current period gross charge-offs, Total | 62,000 |
Commercial Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 87,169,000 | 102,773,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 99,681,000 | 74,242,000
Total Loans, Two Years Before Latest Fiscal Year | 69,980,000 | 121,881,000
Total Loans, Three Years Before Latest Fiscal Year | 116,116,000 | 104,720,000
Total Loans, Four Years Before Latest Fiscal Year | 88,223,000 | 60,941,000
Total Loans, Prior | 243,881,000 | 217,435,000
Revolving Loans Amortized Cost Basis | 18,745,000 | 20,829,000
Total | 723,795,000 | 702,821,000
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
Total Loans, Two Years Before Latest Fiscal Year |  | 262,000
Total Loans, Three Years Before Latest Fiscal Year | 205,000 |
Total Loans, Four Years Before Latest Fiscal Year | 2,036,000 |
Total Loans, Prior | 1,089,000 | 2,148,000
Total | 3,330,000 | 2,415,000
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, Fiscal Year Before Latest Fiscal Year | 135,000 |
Total Loans, Three Years Before Latest Fiscal Year |  | 2,461,000
Total Loans, Four Years Before Latest Fiscal Year | 2,446,000 | 1,405,000
Total Loans, Prior | 7,427,000 | 7,238,000
Revolving Loans Amortized Cost Basis | 400,000 | 400,000
Total | 10,408,000 | 11,639,000
Agricultural Real Estate Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 60,680,000 | 63,488,000
Agricultural Real Estate Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 3,138,000 | 6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 6,005,000 | 3,756,000
Total Loans, Two Years Before Latest Fiscal Year | 3,470,000 | 12,036,000
Total Loans, Three Years Before Latest Fiscal Year | 10,904,000 | 3,960,000
Total Loans, Four Years Before Latest Fiscal Year | 3,736,000 | 7,148,000
Total Loans, Prior | 33,075,000 | 29,811,000
Revolving Loans Amortized Cost Basis | 352,000 | 520,000
Total | 60,680,000 | 63,488,000
Agricultural Real Estate Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 2,984,000 | 6,257,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 5,140,000 | 3,756,000
Total Loans, Two Years Before Latest Fiscal Year | 3,470,000 | 12,036,000
Total Loans, Three Years Before Latest Fiscal Year | 10,904,000 | 3,960,000
Total Loans, Four Years Before Latest Fiscal Year | 3,736,000 | 7,148,000
Total Loans, Prior | 31,936,000 | 29,038,000
Revolving Loans Amortized Cost Basis | 345,000 | 336,000
Total | 58,515,000 | 62,531,000
Agricultural Real Estate Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 154,000 |
Total Loans, Fiscal Year Before Latest Fiscal Year | 865,000 |
Total Loans, Prior | 1,139,000 | 773,000
Revolving Loans Amortized Cost Basis |  | 150,000
Total | 2,158,000 | 923,000
Agricultural Real Estate Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Revolving Loans Amortized Cost Basis | 7,000 | 34,000
Total | 7,000 | 34,000
Commercial Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 223,460,000 | 211,991,000
Commercial Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 52,630,000 | 57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 42,889,000 | 34,365,000
Total Loans, Two Years Before Latest Fiscal Year | 26,552,000 | 29,919,000
Total Loans, Three Years Before Latest Fiscal Year | 26,104,000 | 19,874,000
Total Loans, Four Years Before Latest Fiscal Year | 14,336,000 | 10,233,000
Total Loans, Prior | 20,363,000 | 15,891,000
Revolving Loans Amortized Cost Basis | 40,586,000 | 43,770,000
Total | 223,460,000 | 211,991,000
Current period gross charge-offs, Fiscal Year Before Latest Fiscal Year |  | 11,000
Current period gross charge-offs, Three Years Before Latest Fiscal Year | 60,000 |
Current period gross charge-offs, Four Years Before Latest Fiscal Year | 23,000 | 8,000
Current period gross charge-offs, Prior |  | 51,000
Current period gross charge-offs, Revolving loans amortized cost basis |  | 30,000
Current period gross charge-offs, Total | 83,000 | 100,000
Commercial Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 52,595,000 | 57,939,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 42,889,000 | 34,088,000
Total Loans, Two Years Before Latest Fiscal Year | 26,293,000 | 29,465,000
Total Loans, Three Years Before Latest Fiscal Year | 25,747,000 | 19,163,000
Total Loans, Four Years Before Latest Fiscal Year | 13,748,000 | 10,233,000
Total Loans, Prior | 19,565,000 | 15,042,000
Revolving Loans Amortized Cost Basis | 39,572,000 | 42,906,000
Total | 220,409,000 | 208,836,000
Commercial Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 35,000 |
Total Loans, Two Years Before Latest Fiscal Year |  | 25,000
Total Loans, Three Years Before Latest Fiscal Year | 23,000 |
Total Loans, Prior |  | 106,000
Revolving Loans Amortized Cost Basis | 14,000 | 14,000
Total | 72,000 | 145,000
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
Total Loans, Two Years Before Latest Fiscal Year | 259,000 | 429,000
Total Loans, Three Years Before Latest Fiscal Year | 334,000 | 711,000
Total Loans, Four Years Before Latest Fiscal Year | 588,000 |
Total Loans, Prior | 798,000 | 743,000
Revolving Loans Amortized Cost Basis | 1,000,000 | 850,000
Total | 2,979,000 | 3,010,000
Other Agricultural Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total | 26,260,000 | 30,077,000
Other Agricultural Loans [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 2,289,000 | 4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 3,262,000 | 1,836,000
Total Loans, Two Years Before Latest Fiscal Year | 1,434,000 | 3,721,000
Total Loans, Three Years Before Latest Fiscal Year | 2,560,000 | 2,379,000
Total Loans, Four Years Before Latest Fiscal Year | 2,151,000 | 2,134,000
Total Loans, Prior | 5,018,000 | 4,480,000
Revolving Loans Amortized Cost Basis | 9,546,000 | 11,169,000
Total | 26,260,000 | 30,077,000
Current period gross charge-offs, Prior | 48,000 |
Current period gross charge-offs, Total | 48,000 |
Other Agricultural Loans [Member] | Pass [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Current Fiscal Year | 2,289,000 | 4,358,000
Total Loans, Fiscal Year Before Latest Fiscal Year | 2,892,000 | 1,836,000
Total Loans, Two Years Before Latest Fiscal Year | 1,434,000 | 3,721,000
Total Loans, Three Years Before Latest Fiscal Year | 2,560,000 | 2,379,000
Total Loans, Four Years Before Latest Fiscal Year | 2,151,000 | 2,134,000
Total Loans, Prior | 3,676,000 | 4,353,000
Revolving Loans Amortized Cost Basis | 7,271,000 | 9,697,000
Total | 22,273,000 | 28,478,000
Other Agricultural Loans [Member] | Special Mention [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Total Loans, Fiscal Year Before Latest Fiscal Year | 370,000 |
Total Loans, Prior | 1,342,000 | 127,000
Revolving Loans Amortized Cost Basis | 800,000 |
Total | 2,512,000 | 127,000
Other Agricultural Loans [Member] | Substandard [Member] | Non-Homogenous Pools [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Revolving Loans Amortized Cost Basis | 1,475,000 | 1,472,000
Total | $ 1,475,000 | $ 1,472,000

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