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Loans Receivable and Allowance for Credit Losses (Composition of the Loan Portfolio) (Details) - USD ($) | Jun. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 1,641,531,000 |  | $ 1,603,877,000 |  |  |
Deferred fees, net | (176,000) |  | (259,000) |  |  |
Total loans receivable | 1,641,355,000 |  | 1,603,618,000 |  |  |
Allowance for credit losses | (17,806,000) | $ (18,020,000) | (18,968,000) | $ (17,483,000) | $ (19,445,000) | $ (16,999,000)
Net loans receivable | $ 1,623,549,000 |  | $ 1,584,650,000 |  |  |
Percent of Loans | 100.00% |  | 100.00% |  |  |
Residential Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 317,507,000 |  | $ 316,546,000 |  |  |
Allowance for credit losses | $ (1,131,000) | (1,197,000) | $ (1,351,000) | (1,264,000) | (1,359,000) | (2,833,000)
Percent of Loans | 19.30% |  | 19.70% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 685,212,000 |  | $ 675,156,000 |  |  |
Allowance for credit losses | $ (9,552,000) | (9,831,000) | $ (11,871,000) | (11,253,000) | (13,725,000) | (8,293,000)
Percent of Loans | 41.80% |  | 42.10% |  |  |
Agricultural Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 60,963,000 |  | $ 63,859,000 |  |  |
Percent of Loans | 3.70% |  | 4.00% |  |  |
Construction Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 48,030,000 |  | $ 51,453,000 |  |  |
Allowance for credit losses | $ (840,000) | (831,000) | $ (933,000) | (819,000) | (703,000) | (409,000)
Percent of Loans | 2.90% |  | 3.20% |  |  |
Commercial Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 208,658,000 |  | $ 200,576,000 |  |  |
Allowance for credit losses | $ (2,035,000) | (1,987,000) | $ (1,207,000) | (1,281,000) | (1,158,000) | (2,445,000)
Percent of Loans | 12.70% |  | 12.50% |  |  |
Other Agricultural Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 31,281,000 |  | $ 31,966,000 |  |  |
Percent of Loans | 1.90% |  | 2.00% |  |  |
Consumer Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans | $ 289,880,000 |  | $ 264,321,000 |  |  |
Allowance for credit losses | $ (4,077,000) | $ (3,922,000) | $ (3,454,000) | $ (2,725,000) | $ (2,297,000) | $ (2,636,000)
Percent of Loans | 17.70% |  | 16.50% |  |  |

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