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Loans - Loan Balances Based on Year of Origination (Details)
$ in Thousands
Sep. 30, 2023
USD ($)
Financing Receivable, Credit Quality Indicator [Line Items]  
Gross charge-offs - fiscal year 2023 $ 163
Gross charge-offs - fiscal year 2022 41
Gross charge-offs - fiscal year 2021 88
Gross charge-offs - fiscal year 2020 38
Gross charge-offs - Term Total 330
Gross charge-offs - Grand Total 330
Consumer Real Estate [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 60,417
2022 92,121
2021 92,861
2020 84,478
Prior 133,164
Term Total 463,041
Revolving Loans Amortized Cost Basis 49,949
Grand Total 512,990
Consumer Real Estate [Member] | Pass [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 60,417
2022 92,081
2021 92,221
2020 84,478
Prior 131,759
Term Total 460,956
Revolving Loans Amortized Cost Basis 49,921
Grand Total 510,877
Consumer Real Estate [Member] | Special Mention [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
Prior 68
Term Total 68
Grand Total 68
Consumer Real Estate [Member] | Substandard [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 40
2021 640
Prior 1,337
Term Total 2,017
Revolving Loans Amortized Cost Basis 28
Grand Total 2,045
Agricultural Real Estate [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 24,866
2022 39,757
2021 37,861
2020 26,535
Prior 96,254
Term Total 225,273
Revolving Loans Amortized Cost Basis 97
Grand Total 225,370
Agricultural Real Estate [Member] | Pass [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 24,866
2022 39,508
2021 25,649
2020 26,348
Prior 87,181
Term Total 203,552
Revolving Loans Amortized Cost Basis 97
Grand Total 203,649
Agricultural Real Estate [Member] | Special Mention [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 249
2021 16
Prior 5,307
Term Total 5,572
Grand Total 5,572
Agricultural Real Estate [Member] | Substandard [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2021 12,196
2020 187
Prior 3,766
Term Total 16,149
Grand Total 16,149
Agricultural [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 15,955
2022 22,995
2021 11,665
2020 6,067
Prior 6,281
Term Total 62,963
Revolving Loans Amortized Cost Basis 61,008
Grand Total 123,971
Agricultural [Member] | Pass [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 15,439
2022 22,361
2021 9,654
2020 4,977
Prior 6,281
Term Total 58,712
Revolving Loans Amortized Cost Basis 59,510
Grand Total 118,222
Agricultural [Member] | Substandard [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 516
2022 634
2021 2,011
2020 1,090
Term Total 4,251
Revolving Loans Amortized Cost Basis 1,498
Grand Total 5,749
Commercial Real Estate [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 193,906
2022 448,961
2021 252,124
2020 138,771
Prior 267,852
Term Total 1,301,614
Grand Total 1,301,614
Commercial Real Estate [Member] | Pass [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 159,888
2022 448,961
2021 252,124
2020 127,752
Prior 254,825
Term Total 1,243,550
Grand Total 1,243,550
Commercial Real Estate [Member] | Special Mention [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 33,926
2020 10,944
Prior 11,392
Term Total 56,262
Grand Total 56,262
Commercial Real Estate [Member] | Substandard [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 92
2020 75
Prior 1,635
Term Total 1,802
Grand Total 1,802
Commercial & Industrial [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 45,732
2022 55,084
2021 26,757
2020 23,048
Prior 4,660
Term Total 155,281
Revolving Loans Amortized Cost Basis 95,469
Grand Total 250,750
Commercial & Industrial [Member] | Pass [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 45,543
2022 54,615
2021 26,541
2020 21,958
Prior 3,952
Term Total 152,609
Revolving Loans Amortized Cost Basis 93,655
Grand Total 246,264
Commercial & Industrial [Member] | Special Mention [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 189
2021 216
2020 184
Prior 451
Term Total 1,040
Revolving Loans Amortized Cost Basis 356
Grand Total 1,396
Commercial & Industrial [Member] | Substandard [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2022 469
2020 906
Prior 257
Term Total 1,632
Revolving Loans Amortized Cost Basis 1,458
Grand Total 3,090
Consumer [Member] | Payment Performance [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 18,585
2022 44,435
2021 11,939
2020 5,818
Prior 2,999
Term Total 83,776
Revolving Loans Amortized Cost Basis 46
Grand Total 83,822
Consumer [Member] | Performing [Member] | Payment Performance [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 18,585
2022 44,435
2021 11,939
2020 5,811
Prior 2,999
Term Total 83,769
Revolving Loans Amortized Cost Basis 46
Grand Total 83,815
Consumer [Member] | Nonperforming [Member] | Payment Performance [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2020 7
Term Total 7
Grand Total 7
Other Loan [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 2,810
2021 17,360
2020 6,017
Prior 4,902
Term Total 31,089
Grand Total 31,089
Other Loan [Member] | Pass [Member]  
Financing Receivable, Credit Quality Indicator [Line Items]  
2023 2,810
2021 17,360
2020 6,017
Prior 4,902
Term Total 31,089
Grand Total $ 31,089