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Loans Receivable and Allowance for Credit Losses (Composition of the Loan Portfolio) (Details) - USD ($) | Sep. 30, 2025 | Jun. 30, 2025 | Dec. 31, 2024 | Sep. 30, 2024 | Jun. 30, 2024 | Dec. 31, 2023
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 1,815,138,000 |  | $ 1,714,082,000 |  |  |
Deferred fees, net | (456,000) |  | (444,000) |  |  |
Total loans receivable | 1,814,682,000 |  | 1,713,638,000 |  |  |
Allowance for credit losses | (19,911,000) | $ (20,908,000) | (19,843,000) | $ (18,699,000) | $ (17,806,000) | $ (18,968,000)
Net loans receivable | $ 1,794,771,000 |  | $ 1,693,795,000 |  |  |
Percent of Loans | 100.00% |  | 100.00% |  |  |
Residential Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 339,997,000 |  | $ 330,856,000 |  |  |
Allowance for credit losses | $ (1,117,000) | (1,011,000) | $ (1,146,000) | (1,049,000) | (1,131,000) | (1,351,000)
Percent of Loans | 18.70% |  | 19.30% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 737,533,000 |  | $ 716,875,000 |  |  |
Allowance for credit losses | $ (9,400,000) | (11,039,000) | $ (11,406,000) | (10,466,000) | (9,552,000) | (11,871,000)
Percent of Loans | 40.60% |  | 41.80% |  |  |
Agricultural Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 60,680,000 |  | $ 63,488,000 |  |  |
Allowance for credit losses | $ (23,000) | (39,000) | $ (48,000) | (26,000) | (41,000) | (58,000)
Percent of Loans | 3.30% |  | 3.70% |  |  |
Construction Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 80,311,000 |  | $ 53,020,000 |  |  |
Allowance for credit losses | $ (1,316,000) | (1,163,000) | $ (884,000) | (856,000) | (840,000) | (933,000)
Percent of Loans | 4.50% |  | 3.10% |  |  |
Commercial Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 223,460,000 |  | $ 211,991,000 |  |  |
Allowance for credit losses | $ (2,087,000) | (1,933,000) | $ (1,732,000) | (1,894,000) | (2,035,000) | (1,207,000)
Percent of Loans | 12.30% |  | 12.40% |  |  |
Other Agricultural Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 26,260,000 |  | $ 30,077,000 |  |  |
Percent of Loans | 1.50% |  | 1.70% |  |  |
Consumer Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total Loans | $ 346,897,000 |  | $ 307,775,000 |  |  |
Allowance for credit losses | $ (5,790,000) | $ (5,559,000) | $ (4,465,000) | $ (4,276,000) | $ (4,077,000) | $ (3,454,000)
Percent of Loans | 19.10% |  | 18.00% |  |  |

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