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Loans, Credit Exposures by Internally Assigned Grades, by Origination Year (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
Total loans $ 2,239,659   $ 2,248,836
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
Gross charge-offs 674 $ 7  
Commercial Real Estate [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 11,842   90,740
2023/2022 91,855   342,975
2022/2021 356,359   225,106
2021/2020 231,543   124,112
2020/2019 122,844   89,157
Prior 270,105   190,402
Revolving Loans Amortized Cost Basis 29,002   28,773
Revolving Loans Converted to Term 2,350   1,622
Total loans 1,115,900   1,092,887
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Gross charge-offs 0   0
Commercial Real Estate [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 11,842   90,068
2023/2022 91,283   333,710
2022/2021 347,120   224,873
2021/2020 231,311   122,560
2020/2019 121,301   81,557
Prior 253,615   180,799
Revolving Loans Amortized Cost Basis 27,832   28,360
Revolving Loans Converted to Term 1,873   1,140
Total loans 1,086,177   1,063,067
Commercial Real Estate [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   672
2023/2022 572   7,963
2022/2021 7,695   227
2021/2020 226   1,552
2020/2019 1,543   7,442
Prior 14,864   8,159
Revolving Loans Amortized Cost Basis 836   96
Revolving Loans Converted to Term 59   60
Total loans 25,795   26,171
Commercial Real Estate [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   1,302
2022/2021 1,544   6
2021/2020 6   0
2020/2019 0   158
Prior 1,626   1,444
Revolving Loans Amortized Cost Basis 334   317
Revolving Loans Converted to Term 418   422
Total loans 3,928   3,649
Commercial Real Estate [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
Agricultural Real Estate [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 6,028   23,206
2023/2022 25,627   56,644
2022/2021 59,827   30,489
2021/2020 29,868   32,058
2020/2019 31,267   26,470
Prior 150,777   131,132
Revolving Loans Amortized Cost Basis 14,336   14,105
Revolving Loans Converted to Term 683   698
Total loans 318,413   314,802
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Gross charge-offs 0   0
Agricultural Real Estate [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 6,028   22,632
2023/2022 25,309   47,479
2022/2021 50,854   28,990
2021/2020 28,383   32,058
2020/2019 31,267   25,406
Prior 140,902   118,700
Revolving Loans Amortized Cost Basis 10,703   10,495
Revolving Loans Converted to Term 460   460
Total loans 293,906   286,220
Agricultural Real Estate [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   574
2023/2022 318   9,165
2022/2021 8,973   1,499
2021/2020 1,485   0
2020/2019 0   962
Prior 4,798   7,038
Revolving Loans Amortized Cost Basis 3,558   3,535
Revolving Loans Converted to Term 0   0
Total loans 19,132   22,773
Agricultural Real Estate [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   102
Prior 5,077   5,394
Revolving Loans Amortized Cost Basis 75   75
Revolving Loans Converted to Term 223   238
Total loans 5,375   5,809
Agricultural Real Estate [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
Construction [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 7,011   56,547
2023/2022 59,252   107,994
2022/2021 93,785   29,280
2021/2020 21,515   0
2020/2019 1,937   0
Prior 0   0
Revolving Loans Amortized Cost Basis 884   839
Revolving Loans Converted to Term 122   1,166
Total loans 184,506   195,826
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Gross charge-offs 0   0
Construction [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 7,011   54,973
2023/2022 59,252   102,562
2022/2021 88,283   22,508
2021/2020 13,312   0
2020/2019 1,937   0
Prior 0   0
Revolving Loans Amortized Cost Basis 884   839
Revolving Loans Converted to Term 122   1,166
Total loans 170,801   182,048
Construction [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   1,574
2023/2022 0   5,432
2022/2021 5,502   4,415
2021/2020 3,920   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 9,422   11,421
Construction [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   2,357
2021/2020 4,283   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 4,283   2,357
Construction [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
Other Commercial Loans [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 7,232   31,596
2023/2022 29,195   11,556
2022/2021 10,383   10,526
2021/2020 10,222   4,977
2020/2019 4,641   5,130
Prior 9,085   5,126
Revolving Loans Amortized Cost Basis 56,873   65,439
Revolving Loans Converted to Term 1,807   1,818
Total loans 129,438   136,168
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
2024/2023 0   200
2023/2022 0   0
2022/2021 0   0
2021/2020 0   763
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 644   0
Revolving Loans Converted to Term 0   0
Gross charge-offs 644 0 963
Other Commercial Loans [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 7,232   31,493
2023/2022 27,033   11,407
2022/2021 9,642   9,016
2021/2020 8,758   4,793
2020/2019 4,353   4,758
Prior 7,523   3,530
Revolving Loans Amortized Cost Basis 55,136   63,285
Revolving Loans Converted to Term 88   93
Total loans 119,765   128,375
Other Commercial Loans [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   51
2023/2022 260   52
2022/2021 235   1,510
2021/2020 1,464   184
2020/2019 3   223
Prior 784   629
Revolving Loans Amortized Cost Basis 1,520   1,652
Revolving Loans Converted to Term 36   36
Total loans 4,302   4,337
Other Commercial Loans [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   52
2023/2022 1,851   97
2022/2021 506   0
2021/2020 0   0
2020/2019 285   149
Prior 778   967
Revolving Loans Amortized Cost Basis 139   502
Revolving Loans Converted to Term 1,663   1,667
Total loans 5,222   3,434
Other Commercial Loans [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 51   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 78   0
Revolving Loans Converted to Term 20   22
Total loans 149   22
Other Agricultural Loans [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 341   3,902
2023/2022 3,507   1,993
2022/2021 1,807   6,671
2021/2020 6,061   1,088
2020/2019 984   536
Prior 797   560
Revolving Loans Amortized Cost Basis 10,793   15,863
Revolving Loans Converted to Term 55   60
Total loans 24,345   30,673
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Gross charge-offs 0 0 0
Other Agricultural Loans [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 310   3,902
2023/2022 3,507   1,520
2022/2021 1,363   6,448
2021/2020 5,854   1,046
2020/2019 944   532
Prior 582   305
Revolving Loans Amortized Cost Basis 10,716   15,331
Revolving Loans Converted to Term 0   0
Total loans 23,276   29,084
Other Agricultural Loans [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 31   0
2023/2022 0   473
2022/2021 444   16
2021/2020 16   42
2020/2019 40   0
Prior 0   0
Revolving Loans Amortized Cost Basis 33   488
Revolving Loans Converted to Term 29   29
Total loans 593   1,048
Other Agricultural Loans [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   207
2021/2020 191   0
2020/2019 0   4
Prior 215   255
Revolving Loans Amortized Cost Basis 44   44
Revolving Loans Converted to Term 26   31
Total loans 476   541
Other Agricultural Loans [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
State and Political Subdivision Loans [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   1,623
2023/2022 1,572   14,171
2022/2021 14,142   10,841
2021/2020 10,741   5,235
2020/2019 5,015   0
Prior 24,702   25,294
Revolving Loans Amortized Cost Basis 5   10
Revolving Loans Converted to Term 0   0
Total loans 56,177   57,174
Financing Receivable, Current period gross charge-offs by Portfolio Class and Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Gross charge-offs 0 $ 0 0
State and Political Subdivision Loans [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   1,623
2023/2022 1,572   14,171
2022/2021 14,142   10,841
2021/2020 10,741   5,235
2020/2019 5,015   0
Prior 24,702   25,294
Revolving Loans Amortized Cost Basis 5   10
Revolving Loans Converted to Term 0   0
Total loans 56,177   57,174
State and Political Subdivision Loans [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
State and Political Subdivision Loans [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
State and Political Subdivision Loans [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 0   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 0   0
Revolving Loans Converted to Term 0   0
Total loans 0   0
Total Loans [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 32,454   207,614
2023/2022 211,008   535,333
2022/2021 536,303   312,913
2021/2020 309,950   167,470
2020/2019 166,688   121,293
Prior 455,466   352,514
Revolving Loans Amortized Cost Basis 111,893   125,029
Revolving Loans Converted to Term 5,017   5,364
Total loans 1,828,779   1,827,530
Total Loans [Member] | Pass [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 32,423   204,691
2023/2022 207,956   510,849
2022/2021 511,404   302,676
2021/2020 298,359   165,692
2020/2019 164,817   112,253
Prior 427,324   328,628
Revolving Loans Amortized Cost Basis 105,276   118,320
Revolving Loans Converted to Term 2,543   2,859
Total loans 1,750,102   1,745,968
Total Loans [Member] | Special Mention [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 31   2,871
2023/2022 1,150   23,085
2022/2021 22,849   7,667
2021/2020 7,111   1,778
2020/2019 1,586   8,627
Prior 20,446   15,826
Revolving Loans Amortized Cost Basis 5,947   5,771
Revolving Loans Converted to Term 124   125
Total loans 59,244   65,750
Total Loans [Member] | Substandard [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   52
2023/2022 1,851   1,399
2022/2021 2,050   2,570
2021/2020 4,480   0
2020/2019 285   413
Prior 7,696   8,060
Revolving Loans Amortized Cost Basis 592   938
Revolving Loans Converted to Term 2,330   2,358
Total loans 19,284   15,790
Total Loans [Member] | Doubtful [Member]      
Financing Receivable, before Allowance for Credit Loss, by Origination Year [Abstract]      
2024/2023 0   0
2023/2022 51   0
2022/2021 0   0
2021/2020 0   0
2020/2019 0   0
Prior 0   0
Revolving Loans Amortized Cost Basis 78   0
Revolving Loans Converted to Term 20   22
Total loans $ 149   $ 22