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Loans - Risk Category of Loans by Class (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Financing Receivable, Credit Quality Indicator [Line Items]          
Total $ 4,069,355   $ 4,069,355   $ 3,977,900
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Total 619 $ 650 2,279 $ 2,737  
Commercial and Industrial Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 83,579   83,579   112,673
Year two 97,269   97,269   135,337
Year three 100,867   100,867   86,555
Year four 74,027   74,027   30,101
Year five 21,210   21,210   34,281
Prior 57,395   57,395   49,183
Revolving Loans Amortized Cost Basis 156,930   156,930   141,411
Total 591,277   591,277   589,541
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     4   911
Year three     96   32
Year four     64   493
Year five     0   7
Prior     13   88
Revolving Loans Amortized Cost Basis     46   261
Total 92 175 223 1,252 1,792
Commercial and Industrial Loans | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 83,323   83,323   112,626
Year two 95,627   95,627   134,590
Year three 100,299   100,299   80,738
Year four 70,194   70,194   28,492
Year five 19,325   19,325   32,585
Prior 53,329   53,329   45,764
Revolving Loans Amortized Cost Basis 152,318   152,318   134,936
Total 574,415   574,415   569,731
Commercial and Industrial Loans | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 156   156   47
Year two 1,642   1,642   453
Year three 379   379   128
Year four 544   544   829
Year five 909   909   0
Prior 2,343   2,343   1,948
Revolving Loans Amortized Cost Basis 833   833   3,048
Total 6,806   6,806   6,453
Commercial and Industrial Loans | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 100   100   0
Year two 0   0   294
Year three 189   189   5,689
Year four 3,289   3,289   780
Year five 976   976   1,696
Prior 1,723   1,723   1,471
Revolving Loans Amortized Cost Basis 3,779   3,779   3,427
Total 10,056   10,056   13,357
Commercial and Industrial Loans | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 0   0   0
Commercial Real Estate Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 207,549   207,549   314,475
Year two 331,382   331,382   419,892
Year three 411,804   411,804   487,582
Year four 447,683   447,683   228,461
Year five 199,951   199,951   148,419
Prior 544,187   544,187   481,090
Revolving Loans Amortized Cost Basis 37,425   37,425   41,916
Total 2,179,981   2,179,981   2,121,835
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     0   56
Year four     0   0
Year five     0   0
Prior     308   0
Revolving Loans Amortized Cost Basis     0   0
Total 0 56 308 56 56
Commercial Real Estate Loans | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 207,054   207,054   300,569
Year two 317,427   317,427   416,874
Year three 407,500   407,500   470,917
Year four 429,879   429,879   225,668
Year five 197,875   197,875   147,431
Prior 525,716   525,716   458,821
Revolving Loans Amortized Cost Basis 37,225   37,225   41,102
Total 2,122,676   2,122,676   2,061,382
Commercial Real Estate Loans | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 495   495   13,906
Year two 13,498   13,498   2,401
Year three 3,077   3,077   11,155
Year four 12,582   12,582   1,651
Year five 2,014   2,014   259
Prior 14,994   14,994   19,532
Revolving Loans Amortized Cost Basis 200   200   638
Total 46,860   46,860   49,542
Commercial Real Estate Loans | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 457   457   617
Year three 1,227   1,227   5,510
Year four 5,222   5,222   1,142
Year five 62   62   729
Prior 3,477   3,477   2,737
Revolving Loans Amortized Cost Basis 0   0   176
Total 10,445   10,445   10,911
Commercial Real Estate Loans | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 0   0   0
Agricultural Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 43,556   43,556   46,443
Year two 39,156   39,156   56,455
Year three 49,835   49,835   40,954
Year four 35,428   35,428   47,514
Year five 42,661   42,661   25,755
Prior 124,202   124,202   114,968
Revolving Loans Amortized Cost Basis 82,635   82,635   91,714
Total 417,473   417,473   423,803
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     0   0
Year four     0   2
Year five     0   0
Prior     8   0
Revolving Loans Amortized Cost Basis     0   25
Total 7 2 8 27 27
Agricultural Loans | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 42,832   42,832   44,948
Year two 37,719   37,719   56,291
Year three 49,689   49,689   39,852
Year four 34,596   34,596   42,279
Year five 37,571   37,571   23,217
Prior 107,791   107,791   100,391
Revolving Loans Amortized Cost Basis 79,919   79,919   89,455
Total 390,117   390,117   396,433
Agricultural Loans | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 548   548   1,495
Year two 1,437   1,437   164
Year three 146   146   903
Year four 832   832   5,047
Year five 5,090   5,090   2,338
Prior 11,905   11,905   9,894
Revolving Loans Amortized Cost Basis 2,716   2,716   2,259
Total 22,674   22,674   22,100
Agricultural Loans | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 176   176   0
Year two 0   0   0
Year three 0   0   199
Year four 0   0   188
Year five 0   0   200
Prior 4,506   4,506   4,683
Revolving Loans Amortized Cost Basis 0   0   0
Total 4,682   4,682   5,270
Agricultural Loans | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 0   0   0
Leases          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 25,831   25,831   36,848
Year two 28,480   28,480   12,281
Year three 9,324   9,324   10,634
Year four 7,430   7,430   6,086
Year five 3,018   3,018   4,788
Prior 4,744   4,744   1,351
Revolving Loans Amortized Cost Basis 0   0   0
Total 78,827   78,827   71,988
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     0   0
Year four     0   0
Year five     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Total 0 0 0 0 0
Leases | Pass          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 25,831   25,831   36,848
Year two 28,480   28,480   12,281
Year three 9,324   9,324   10,634
Year four 7,430   7,430   6,086
Year five 3,018   3,018   4,788
Prior 4,744   4,744   1,351
Revolving Loans Amortized Cost Basis 0   0   0
Total 78,827   78,827   71,988
Leases | Special Mention          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 0   0   0
Leases | Substandard          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 0   0   0
Leases | Doubtful          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0   0   0
Year two 0   0   0
Year three 0   0   0
Year four 0   0   0
Year five 0   0   0
Prior 0   0   0
Revolving Loans Amortized Cost Basis 0   0   0
Total 0   0   0
Consumer Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 33,505   33,505   49,282
Year two 26,840   26,840   21,480
Year three 11,071   11,071   9,720
Year four 6,223   6,223   2,756
Year five 1,417   1,417   917
Prior 1,780   1,780   1,912
Revolving Loans Amortized Cost Basis 2,046   2,046   1,786
Total 82,882   82,882   87,853
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     902   1,162
Year two     125   42
Year three     48   23
Year four     37   71
Year five     0   3
Prior     2   1
Revolving Loans Amortized Cost Basis     3   7
Total 364 352 1,117 980 1,309
Home Equity Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 55   55   0
Year two 264   264   417
Year three 4,045   4,045   488
Year four 663   663   150
Year five 424   424   165
Prior 3,905   3,905   1,309
Revolving Loans Amortized Cost Basis 324,473   324,473   297,156
Total 333,829   333,829   299,685
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     35   0
Year four     99   55
Year five     0   0
Prior     0   24
Revolving Loans Amortized Cost Basis     0   15
Total 0 0 134 39 94
Residential Mortgage Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 40,889   40,889   56,317
Year two 53,083   53,083   65,361
Year three 59,684   59,684   86,170
Year four 76,003   76,003   41,639
Year five 37,405   37,405   17,940
Prior 95,351   95,351   95,417
Revolving Loans Amortized Cost Basis 0   0   0
Total 362,415   362,415   362,844
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss, Writeoff, by Origination Year [Abstract]          
Year one     0   0
Year two     0   0
Year three     0   22
Year four     0   36
Year five     0   0
Prior     0   0
Revolving Loans Amortized Cost Basis     0   0
Total $ 0 $ 1 $ 0 $ 58 $ 58