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Loans Receivable and Allowance for Credit Losses (Loan Portfolio Summarized by the Past Due Status) (Details) - USD ($) | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 1,815,138,000 | $ 1,714,082,000
Non-Accrual | 6,565,000 | 7,720,000
Total Past Due and Non-Accrual | 9,702,000 | 10,962,000
Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 1,805,436,000 | 1,703,120,000
Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 2,489,000 | 2,311,000
Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 623,000 | 777,000
Financing Receivables, Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,000 | 154,000
Residential Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 339,997,000 | 330,856,000
Non-Accrual | 1,077,000 | 940,000
Total Past Due and Non-Accrual | 1,694,000 | 1,278,000
Residential Real Estate Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 338,303,000 | 329,578,000
Residential Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 368,000 | 70,000
Residential Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 249,000 | 268,000
Commercial Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 737,533,000 | 716,875,000
Non-Accrual | 4,018,000 | 5,743,000
Total Past Due and Non-Accrual | 4,501,000 | 7,054,000
Commercial Real Estate Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 733,032,000 | 709,821,000
Commercial Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 483,000 | 1,182,000
Commercial Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 129,000
Agricultural Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 60,680,000 | 63,488,000
Total Past Due and Non-Accrual | 639,000 |
Agricultural Real Estate Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 60,041,000 | 63,488,000
Agricultural Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 592,000 |
Agricultural Real Estate Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 47,000 |
Construction Real Estate Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 80,311,000 | 53,020,000
Non-Accrual | 50,000 |
Total Past Due and Non-Accrual | 50,000 | 11,000
Construction Real Estate Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 80,261,000 | 53,009,000
Construction Real Estate Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 11,000
Commercial Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 223,460,000 | 211,991,000
Non-Accrual | 69,000 | 127,000
Total Past Due and Non-Accrual | 426,000 | 471,000
Commercial Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 223,034,000 | 211,520,000
Commercial Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 333,000 | 194,000
Commercial Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 24,000 | 117,000
Commercial Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | 33,000
Other Agricultural Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,260,000 | 30,077,000
Total Past Due and Non-Accrual | 233,000 | 49,000
Other Agricultural Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 26,027,000 | 30,028,000
Other Agricultural Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 208,000 | 49,000
Other Agricultural Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 25,000 |
Consumer Loans [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 346,897,000 | 307,775,000
Non-Accrual | 1,351,000 | 910,000
Total Past Due and Non-Accrual | 2,159,000 | 2,099,000
Consumer Loans [Member] | Financial Asset, Not Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 344,738,000 | 305,676,000
Consumer Loans [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | 505,000 | 805,000
Consumer Loans [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans | $ 303,000 | 263,000
Consumer Loans [Member] | Financing Receivables, Greater than 90 Days Past Due [Member] |  |
Financing Receivable, Past Due [Line Items] |  |
Loans |  | $ 121,000

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