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Loans Receivable and Allowance for Loan Losses (Composition of the Loan Portfolio) (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Mar. 31, 2023 | Jan. 01, 2023 | Dec. 31, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 1,577,983 |  |  | $ 1,474,424 |  |  |
Deferred fees, net | (284) |  |  | (479) |  |  |
Total loans receivable | 1,577,699 |  |  | 1,473,945 |  |  |
Allowance for credit losses | (17,483) | $ (19,445) |  | (16,999) | $ (17,017) | $ (16,660) | $ (16,442)
Net loans receivable | $ 1,560,216 |  |  | $ 1,456,946 |  |  |
Percent of Loans | 100.00% |  |  | 100.00% |  |  |
Residential Real Estate Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 307,462 |  |  | $ 298,813 |  |  |
Allowance for credit losses | $ (1,264) | (1,359) | $ (1,288) | $ (2,833) | (2,740) | (2,326) | (2,175)
Percent of Loans | 19.50% |  |  | 20.30% |  |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 670,353 |  |  | $ 651,544 |  |  |
Allowance for credit losses | $ (11,253) | (13,725) | (13,820) | $ (8,293) | (9,155) | (10,287) | (10,878)
Percent of Loans | 42.50% |  |  | 44.20% |  |  |
Agricultural Real Estate Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 67,729 |  |  | $ 68,915 |  |  |
Allowance for credit losses |  |  | (59) |  |  |  |
Percent of Loans | 4.30% |  |  | 4.70% |  |  |
Construction Real Estate Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 38,245 |  |  | $ 32,469 |  |  |
Allowance for credit losses | $ (819) | (703) | (797) | $ (409) | (242) | (134) | (133)
Percent of Loans | 2.40% |  |  | 2.20% |  |  |
Commercial Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 211,714 |  |  | $ 187,257 |  |  |
Allowance for credit losses | $ (1,281) | (1,158) | (1,289) | $ (2,445) | (2,504) | (1,495) | (1,490)
Percent of Loans | 13.40% |  |  | 12.70% |  |  |
Other Agricultural Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 34,722 |  |  | $ 35,277 |  |  |
Allowance for credit losses |  |  | (127) |  |  |  |
Percent of Loans | 2.20% |  |  | 2.40% |  |  |
Consumer Loans [Member] |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Loans | $ 247,758 |  |  | $ 200,149 |  |  |
Allowance for credit losses | $ (2,725) | $ (2,297) | $ (2,085) | $ (2,636) | $ (2,046) | $ (1,622) | $ (1,766)
Percent of Loans | 15.70% |  |  | 13.50% |  |  |

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