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Loans Receivable and Allowance for Credit Losses (Composition of the Loan Portfolio) (Details) - USD ($) | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 1,621,680,000 | $ 1,603,877,000 |
Deferred fees, net | (232,000) | (259,000) |
Total loans receivable | 1,621,448,000 | 1,603,618,000 |
Allowance for credit losses | (18,020,000) | (18,968,000) | $ (19,445,000)
Net loans receivable | $ 1,603,428,000 | $ 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 | $ 313,531,000 | $ 316,546,000 |
Allowance for credit losses | $ (1,197,000) | $ (1,351,000) | (1,359,000)
Percent of Loans | 19.30% | 19.70% |
Commercial Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 691,755,000 | $ 675,156,000 |
Allowance for credit losses | $ (9,831,000) | $ (11,871,000) | (13,725,000)
Percent of Loans | 42.70% | 42.10% |
Agricultural Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 62,309,000 | $ 63,859,000 |
Percent of Loans | 3.90% | 4.00% |
Construction Real Estate Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 47,409,000 | $ 51,453,000 |
Allowance for credit losses | $ (831,000) | $ (933,000) | (703,000)
Percent of Loans | 2.90% | 3.20% |
Commercial Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 204,006,000 | $ 200,576,000 |
Allowance for credit losses | $ (1,987,000) | $ (1,207,000) | (1,158,000)
Percent of Loans | 12.60% | 12.50% |
Other Agricultural Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 31,439,000 | $ 31,966,000 |
Percent of Loans | 1.90% | 2.00% |
Consumer Loans [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans | $ 271,231,000 | $ 264,321,000 |
Allowance for credit losses | $ (3,922,000) | $ (3,454,000) | $ (2,297,000)
Percent of Loans | 16.70% | 16.50% |

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