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Loans, Major Classifications of Loans (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | $ 1,379,521 | $ 1,369,445 |  |
Allowance for loan losses | 5,530 | 5,506 | $ 5,679 | $ 5,728
Total | 1,373,991 | 1,363,939 |  |
Loans and Leases Receivable, Net of Deferred Income | 1,379,521 | 1,369,445 |  |
Loans and Leases Receivable, Deferred Income | 928 | 961 |  |
Commercial and industrial [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | 105,809 | 101,598 |  |
Allowance for loan losses | 1,297 | 1,095 | 957 | 816
Loans and Leases Receivable, Net of Deferred Income | 105,809 | 101,598 |  |
Commercial, secured by real estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | 904,562 | 887,679 |  |
Allowance for loan losses | 3,494 | 3,607 | 3,634 | 3,903
Loans and Leases Receivable, Net of Deferred Income | 904,562 | 887,679 |  |
Residential real estate [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | 328,574 | 335,106 |  |
Allowance for loan losses | 639 | 665 | 919 | 837
Loans and Leases Receivable, Net of Deferred Income | 328,574 | 335,106 |  |
Consumer [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | 32,541 | 34,291 |  |
Allowance for loan losses | 73 | 105 | 131 | 153
Loans and Leases Receivable, Net of Deferred Income | 32,541 | 34,291 |  |
Agricultural [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | 7,990 | 10,649 |  |
Allowance for loan losses | 18 | 30 | 39 | 28
Loans and Leases Receivable, Net of Deferred Income | 7,990 | 10,649 |  |
Other loans, including deposit overdrafts [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans gross | 45 | 122 |  |
Allowance for loan losses | 9 | 4 | $ (1) | $ (9)
Loans and Leases Receivable, Net of Deferred Income | $ 45 | $ 122 |  |

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