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Note 4 - Loans and Allowance for Credit Losses - Schedule of Financing Receivable Credit Quality Indicators (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Current Fiscal Year $ 220,208   $ 220,208   $ 713,598
Fiscal Year before Current Fiscal Year 726,747   726,747   712,874
Two Years before Current Fiscal Year 677,352   677,352   853,524
Three Years before Current Fiscal Year 786,497   786,497   503,370
Four Years before Current Fiscal Year 457,447   457,447   360,131
More than Four Years before Current Fiscal Year 760,758   760,758   527,593
Revolving 415,648   415,648   321,444
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 4,044,657   4,044,657   3,992,534
Current Fiscal Year, Gross Charge-offs     0   4
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   232
Two Years before Current Fiscal Year, Gross Charge-offs     47   99
Three Years before Current Fiscal Year, Gross Charge-offs     1,588   428
Four Years before Current Fiscal Year, Gross Charge-offs     782   2,774
More than Four Years before Current Fiscal Year, Gross Charge-offs     2,313   1,161
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs 3,918 $ 2,734 4,730 $ 2,939 4,698
Commercial Borrower [Member]          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,824,087   2,824,087   2,787,277
Loans, Gross Charge-offs 3,870 2,730 4,039 2,923  
Commercial Borrower [Member] | Commercial Portfolio Segment [Member]          
Current Fiscal Year 80,009   80,009   210,368
Fiscal Year before Current Fiscal Year 177,628   177,628   154,186
Two Years before Current Fiscal Year 105,306   105,306   64,760
Three Years before Current Fiscal Year 55,666   55,666   37,664
Four Years before Current Fiscal Year 28,644   28,644   47,071
More than Four Years before Current Fiscal Year 62,434   62,434   38,635
Revolving 166,205   166,205   114,043
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 675,892   675,892   666,727
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   218
Two Years before Current Fiscal Year, Gross Charge-offs     0   2
Three Years before Current Fiscal Year, Gross Charge-offs     0   397
Four Years before Current Fiscal Year, Gross Charge-offs     0   2,768
More than Four Years before Current Fiscal Year, Gross Charge-offs     248   342
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs     248   3,727
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Pass [Member]          
Current Fiscal Year 78,791   78,791   209,001
Fiscal Year before Current Fiscal Year 167,272   167,272   141,028
Two Years before Current Fiscal Year 100,345   100,345   61,254
Three Years before Current Fiscal Year 52,029   52,029   34,645
Four Years before Current Fiscal Year 27,322   27,322   38,342
More than Four Years before Current Fiscal Year 52,389   52,389   36,136
Revolving 152,868   152,868   111,194
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 631,016   631,016   631,600
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Special Mention [Member]          
Current Fiscal Year 0   0   1,367
Fiscal Year before Current Fiscal Year 11   11   495
Two Years before Current Fiscal Year 0   0   3,286
Three Years before Current Fiscal Year 0   0   2,239
Four Years before Current Fiscal Year 674   674   5,575
More than Four Years before Current Fiscal Year 0   0   1
Revolving 0   0   1,651
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 685   685   14,614
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Substandard [Member]          
Current Fiscal Year 1,218   1,218   0
Fiscal Year before Current Fiscal Year 10,345   10,345   12,663
Two Years before Current Fiscal Year 4,961   4,961   220
Three Years before Current Fiscal Year 3,637   3,637   780
Four Years before Current Fiscal Year 648   648   3,154
More than Four Years before Current Fiscal Year 10,045   10,045   2,447
Revolving 13,337   13,337   1,198
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 44,191   44,191   20,462
Commercial Borrower [Member] | Commercial Portfolio Segment [Member] | Doubtful [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   51
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   51
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member]          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,013,869   2,013,869   1,996,243
Loans, Gross Charge-offs 3,407 (0) 3,407 29  
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Construction, Land, and Development [Member]          
Current Fiscal Year 5,355   5,355   102,650
Fiscal Year before Current Fiscal Year 138,946   138,946   112,845
Two Years before Current Fiscal Year 142,272   142,272   72,647
Three Years before Current Fiscal Year 60,665   60,665   1,560
Four Years before Current Fiscal Year 667   667   517
More than Four Years before Current Fiscal Year 1,314   1,314   1,357
Revolving 3,530   3,530   3,101
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 352,749   352,749   294,677
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     0   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   0
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs (0) (0) (0) (0) 0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]          
Current Fiscal Year 2,944   2,944   35,112
Fiscal Year before Current Fiscal Year 32,588   32,588   62,982
Two Years before Current Fiscal Year 44,187   44,187   146,342
Three Years before Current Fiscal Year 137,977   137,977   34,054
Four Years before Current Fiscal Year 33,754   33,754   52,130
More than Four Years before Current Fiscal Year 81,857   81,857   32,503
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 333,307   333,307   363,123
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     0   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   0
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs (0) (0) (0) (0) 0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-Owner Occupied [Member]          
Current Fiscal Year 49,808   49,808   189,068
Fiscal Year before Current Fiscal Year 193,356   193,356   149,368
Two Years before Current Fiscal Year 157,420   157,420   225,043
Three Years before Current Fiscal Year 198,706   198,706   114,679
Four Years before Current Fiscal Year 91,968   91,968   77,779
More than Four Years before Current Fiscal Year 194,415   194,415   205,184
Revolving 1,970   1,970   5,904
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 887,643   887,643   967,025
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     632   0
Four Years before Current Fiscal Year, Gross Charge-offs     775   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     1,994   0
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs 3,401 (0) 3,401 (0) 0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loans [Member]          
Current Fiscal Year 26,322   26,322   64,172
Fiscal Year before Current Fiscal Year 84,255   84,255   42,229
Two Years before Current Fiscal Year 59,473   59,473   63,811
Three Years before Current Fiscal Year 65,985   65,985   48,588
Four Years before Current Fiscal Year 45,620   45,620   41,922
More than Four Years before Current Fiscal Year 156,510   156,510   108,077
Revolving 2,005   2,005   2,619
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 440,170   440,170   371,418
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   12
Two Years before Current Fiscal Year, Gross Charge-offs     6   97
Three Years before Current Fiscal Year, Gross Charge-offs     0   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   128
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs 6 (0) 6 29 237
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction, Land, and Development [Member]          
Current Fiscal Year 5,355   5,355   97,244
Fiscal Year before Current Fiscal Year 128,894   128,894   112,845
Two Years before Current Fiscal Year 142,272   142,272   40,890
Three Years before Current Fiscal Year 28,622   28,622   1,560
Four Years before Current Fiscal Year 667   667   517
More than Four Years before Current Fiscal Year 1,140   1,140   1,187
Revolving 3,230   3,230   2,801
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 310,180   310,180   257,044
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Multifamily Loan [Member]          
Current Fiscal Year 2,944   2,944   35,112
Fiscal Year before Current Fiscal Year 26,832   26,832   62,982
Two Years before Current Fiscal Year 40,215   40,215   138,698
Three Years before Current Fiscal Year 112,825   112,825   33,782
Four Years before Current Fiscal Year 32,933   32,933   33,157
More than Four Years before Current Fiscal Year 63,015   63,015   32,204
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 278,764   278,764   335,935
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Non-Owner Occupied [Member]          
Current Fiscal Year 49,808   49,808   189,068
Fiscal Year before Current Fiscal Year 193,356   193,356   149,368
Two Years before Current Fiscal Year 152,003   152,003   223,349
Three Years before Current Fiscal Year 197,413   197,413   98,309
Four Years before Current Fiscal Year 89,190   89,190   71,432
More than Four Years before Current Fiscal Year 185,169   185,169   188,617
Revolving 1,970   1,970   1,709
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 868,909   868,909   921,852
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied Loans [Member]          
Current Fiscal Year 26,322   26,322   63,721
Fiscal Year before Current Fiscal Year 83,805   83,805   41,918
Two Years before Current Fiscal Year 56,577   56,577   60,788
Three Years before Current Fiscal Year 63,039   63,039   44,957
Four Years before Current Fiscal Year 43,710   43,710   38,941
More than Four Years before Current Fiscal Year 136,665   136,665   91,804
Revolving 1,435   1,435   1,652
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 411,553   411,553   343,781
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction, Land, and Development [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   172
Three Years before Current Fiscal Year 175   175   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 175   175   172
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Multifamily Loan [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   7,644
Three Years before Current Fiscal Year 25,152   25,152   272
Four Years before Current Fiscal Year 821   821   1,241
More than Four Years before Current Fiscal Year 1,001   1,001   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 26,974   26,974   9,157
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Non-Owner Occupied [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   1,694
Three Years before Current Fiscal Year 0   0   8,603
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 1,063   1,063   4,148
Revolving 0   0   4,195
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,063   1,063   18,640
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied Loans [Member]          
Current Fiscal Year 0   0   451
Fiscal Year before Current Fiscal Year 450   450   0
Two Years before Current Fiscal Year 1,400   1,400   0
Three Years before Current Fiscal Year 0   0   937
Four Years before Current Fiscal Year 0   0   2,981
More than Four Years before Current Fiscal Year 4,317   4,317   2,735
Revolving 570   570   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 6,737   6,737   7,104
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction, Land, and Development [Member]          
Current Fiscal Year 0   0   5,406
Fiscal Year before Current Fiscal Year 10,052   10,052   0
Two Years before Current Fiscal Year 0   0   31,585
Three Years before Current Fiscal Year 31,868   31,868   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 174   174   170
Revolving 300   300   300
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 42,394   42,394   37,461
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Multifamily Loan [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 5,756   5,756   0
Two Years before Current Fiscal Year 3,972   3,972   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   17,732
More than Four Years before Current Fiscal Year 17,841   17,841   299
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 27,569   27,569   18,031
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Non-Owner Occupied [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 5,417   5,417   0
Three Years before Current Fiscal Year 1,293   1,293   7,767
Four Years before Current Fiscal Year 2,778   2,778   6,347
More than Four Years before Current Fiscal Year 8,183   8,183   12,419
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 17,671   17,671   26,533
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied Loans [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   311
Two Years before Current Fiscal Year 1,496   1,496   3,023
Three Years before Current Fiscal Year 2,946   2,946   2,694
Four Years before Current Fiscal Year 1,910   1,910   0
More than Four Years before Current Fiscal Year 15,528   15,528   13,538
Revolving 0   0   967
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 21,880   21,880   20,533
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Construction, Land, and Development [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Multifamily Loan [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Non-Owner Occupied [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   0
Commercial Borrower [Member] | Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Owner Occupied Loans [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   0
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member]          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 134,326   134,326   124,307
Loans, Gross Charge-offs 384 (0) 384 (0)  
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Land [Member]          
Current Fiscal Year 6,427   6,427   10,565
Fiscal Year before Current Fiscal Year 9,376   9,376   10,779
Two Years before Current Fiscal Year 9,834   9,834   19,810
Three Years before Current Fiscal Year 19,544   19,544   5,840
Four Years before Current Fiscal Year 5,672   5,672   5,712
More than Four Years before Current Fiscal Year 13,628   13,628   8,473
Revolving 1,914   1,914   120
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 66,395   66,395   61,299
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     0   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   0
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs (0) (0) (0) (0) 0
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Production Loans [Member]          
Current Fiscal Year 8,161   8,161   10,575
Fiscal Year before Current Fiscal Year 8,578   8,578   7,144
Two Years before Current Fiscal Year 6,483   6,483   6,343
Three Years before Current Fiscal Year 5,347   5,347   724
Four Years before Current Fiscal Year 512   512   1,541
More than Four Years before Current Fiscal Year 1,485   1,485   636
Revolving 37,365   37,365   36,045
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 67,931   67,931   63,008
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     384   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   26
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs 384 (0) 384 (0) 26
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Pass [Member] | Land [Member]          
Current Fiscal Year 6,427   6,427   10,496
Fiscal Year before Current Fiscal Year 9,376   9,376   8,864
Two Years before Current Fiscal Year 9,531   9,531   14,369
Three Years before Current Fiscal Year 12,568   12,568   5,840
Four Years before Current Fiscal Year 5,672   5,672   5,103
More than Four Years before Current Fiscal Year 12,793   12,793   8,473
Revolving 1,914   1,914   120
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 58,281   58,281   53,265
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Pass [Member] | Production Loans [Member]          
Current Fiscal Year 8,161   8,161   10,445
Fiscal Year before Current Fiscal Year 8,140   8,140   6,440
Two Years before Current Fiscal Year 5,691   5,691   4,356
Three Years before Current Fiscal Year 4,011   4,011   724
Four Years before Current Fiscal Year 484   484   1,121
More than Four Years before Current Fiscal Year 1,077   1,077   582
Revolving 36,187   36,187   34,527
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 63,751   63,751   58,195
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Special Mention [Member] | Land [Member]          
Current Fiscal Year 0   0   69
Fiscal Year before Current Fiscal Year 0   0   1,612
Two Years before Current Fiscal Year 0   0   3,275
Three Years before Current Fiscal Year 3,372   3,372   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 3,372   3,372   4,956
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Special Mention [Member] | Production Loans [Member]          
Current Fiscal Year 0   0   130
Fiscal Year before Current Fiscal Year 415   415   704
Two Years before Current Fiscal Year 253   253   0
Three Years before Current Fiscal Year 99   99   0
Four Years before Current Fiscal Year 0   0   420
More than Four Years before Current Fiscal Year 408   408   0
Revolving 150   150   1,518
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,325   1,325   2,772
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Substandard [Member] | Land [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   303
Two Years before Current Fiscal Year 303   303   2,166
Three Years before Current Fiscal Year 3,604   3,604   0
Four Years before Current Fiscal Year 0   0   609
More than Four Years before Current Fiscal Year 835   835   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 4,742   4,742   3,078
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Substandard [Member] | Production Loans [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 23   23   0
Two Years before Current Fiscal Year 539   539   1,987
Three Years before Current Fiscal Year 1,237   1,237   0
Four Years before Current Fiscal Year 28   28   0
More than Four Years before Current Fiscal Year 0   0   54
Revolving 1,028   1,028   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,855   2,855   2,041
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Doubtful [Member] | Land [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   0
Commercial Borrower [Member] | Agricultural Real Estate Portfolio Segment [Member] | Doubtful [Member] | Production Loans [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   0
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0   0   0
Consumer Borrower [Member]          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss         1,205,257
Loans, Gross Charge-offs 48 4 691 16  
Consumer Borrower [Member] | Commercial Portfolio Segment [Member]          
Loans, Gross Charge-offs 79 2,730 248 2,894  
Consumer Borrower [Member] | Residential Portfolio Segment [Member]          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,179,566   1,179,566   1,161,135
Loans, Gross Charge-offs 10 3 614 3  
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member]          
Current Fiscal Year 27,992   27,992   49,414
Fiscal Year before Current Fiscal Year 45,602   45,602   145,036
Two Years before Current Fiscal Year 132,555   132,555   226,993
Three Years before Current Fiscal Year 218,932   218,932   251,750
Four Years before Current Fiscal Year 243,251   243,251   127,212
More than Four Years before Current Fiscal Year 233,406   233,406   120,614
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 901,738   901,738   921,019
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     0   0
Four Years before Current Fiscal Year, Gross Charge-offs     7   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     47   0
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs (0) (0) 54 (0) 0
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member] | Performing Financial Instruments [Member]          
Current Fiscal Year 27,992   27,992   49,414
Fiscal Year before Current Fiscal Year 45,602   45,602   144,460
Two Years before Current Fiscal Year 131,981   131,981   226,993
Three Years before Current Fiscal Year 218,932   218,932   251,006
Four Years before Current Fiscal Year 242,815   242,815   127,200
More than Four Years before Current Fiscal Year 231,766   231,766   118,958
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 899,088   899,088   918,031
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, First Lien [Member] | Nonperforming Financial Instruments [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   576
Two Years before Current Fiscal Year 574   574   0
Three Years before Current Fiscal Year 0   0   744
Four Years before Current Fiscal Year 436   436   12
More than Four Years before Current Fiscal Year 1,640   1,640   1,656
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,650   2,650   2,988
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member]          
Current Fiscal Year 6,010   6,010   19,229
Fiscal Year before Current Fiscal Year 21,246   21,246   6,449
Two Years before Current Fiscal Year 872   872   6,580
Three Years before Current Fiscal Year 4,680   4,680   1,289
Four Years before Current Fiscal Year 1,043   1,043   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 1,903   1,903   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 35,754   35,754   33,547
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     0   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   0
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs (0) (0) (0) (0) 0
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member] | Performing Financial Instruments [Member]          
Current Fiscal Year 6,010   6,010   19,229
Fiscal Year before Current Fiscal Year 21,246   21,246   6,449
Two Years before Current Fiscal Year 872   872   1,900
Three Years before Current Fiscal Year 0   0   1,289
Four Years before Current Fiscal Year 1,043   1,043   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 1,903   1,903   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 31,074   31,074   28,867
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Construction Loans [Member] | Nonperforming Financial Instruments [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   0
Two Years before Current Fiscal Year 0   0   4,680
Three Years before Current Fiscal Year 4,680   4,680   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 0   0   0
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 4,680   4,680   4,680
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member]          
Current Fiscal Year 328   328   3,290
Fiscal Year before Current Fiscal Year 2,773   2,773   5,593
Two Years before Current Fiscal Year 4,632   4,632   6,217
Three Years before Current Fiscal Year 6,810   6,810   1,622
Four Years before Current Fiscal Year 1,441   1,441   939
More than Four Years before Current Fiscal Year 4,304   4,304   2,791
Revolving 180,336   180,336   142,057
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 200,624   200,624   162,509
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     10   0
Three Years before Current Fiscal Year, Gross Charge-offs     250   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   19
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs 10 (0) 260 (0) 19
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]          
Current Fiscal Year 328   328   3,290
Fiscal Year before Current Fiscal Year 2,773   2,773   5,558
Two Years before Current Fiscal Year 4,607   4,607   6,217
Three Years before Current Fiscal Year 5,680   5,680   1,622
Four Years before Current Fiscal Year 1,441   1,441   939
More than Four Years before Current Fiscal Year 4,246   4,246   2,717
Revolving 180,336   180,336   140,707
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 199,411   199,411   161,050
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 0   0   35
Two Years before Current Fiscal Year 25   25   0
Three Years before Current Fiscal Year 1,130   1,130   0
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 58   58   74
Revolving 0   0   1,350
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,213   1,213   1,459
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member]          
Current Fiscal Year 2,751   2,751   9,537
Fiscal Year before Current Fiscal Year 8,524   8,524   11,557
Two Years before Current Fiscal Year 10,664   10,664   9,853
Three Years before Current Fiscal Year 8,313   8,313   5,098
Four Years before Current Fiscal Year 4,591   4,591   2,760
More than Four Years before Current Fiscal Year 6,557   6,557   5,205
Revolving 50   50   50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 41,450   41,450   44,060
Current Fiscal Year, Gross Charge-offs     0   0
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   0
Two Years before Current Fiscal Year, Gross Charge-offs     0   0
Three Years before Current Fiscal Year, Gross Charge-offs     300   0
Four Years before Current Fiscal Year, Gross Charge-offs     0   0
More than Four Years before Current Fiscal Year, Gross Charge-offs     0   638
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs (0) 3 300 3 638
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member] | Performing Financial Instruments [Member]          
Current Fiscal Year 2,751   2,751   7,762
Fiscal Year before Current Fiscal Year 6,749   6,749   11,557
Two Years before Current Fiscal Year 10,664   10,664   9,553
Three Years before Current Fiscal Year 8,313   8,313   4,990
Four Years before Current Fiscal Year 4,591   4,591   2,760
More than Four Years before Current Fiscal Year 5,964   5,964   4,178
Revolving 50   50   50
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 39,082   39,082   40,850
Consumer Borrower [Member] | Residential Portfolio Segment [Member] | Real Estate, Junior Lien [Member] | Nonperforming Financial Instruments [Member]          
Current Fiscal Year 0   0   1,775
Fiscal Year before Current Fiscal Year 1,775   1,775   0
Two Years before Current Fiscal Year 0   0   300
Three Years before Current Fiscal Year 0   0   108
Four Years before Current Fiscal Year 0   0   0
More than Four Years before Current Fiscal Year 593   593   1,027
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,368   2,368   3,210
Consumer Borrower [Member] | Consumer Portfolio Segment [Member]          
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,220,570   1,220,570   1,205,257
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member]          
Current Fiscal Year 4,101   4,101   9,618
Fiscal Year before Current Fiscal Year 3,875   3,875   4,706
Two Years before Current Fiscal Year 3,654   3,654   5,125
Three Years before Current Fiscal Year 3,872   3,872   502
Four Years before Current Fiscal Year 284   284   2,548
More than Four Years before Current Fiscal Year 4,848   4,848   4,118
Revolving 20,370   20,370   17,505
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 41,004   41,004   44,122
Current Fiscal Year, Gross Charge-offs     0   4
Fiscal Year before Current Fiscal Year, Gross Charge-offs     0   2
Two Years before Current Fiscal Year, Gross Charge-offs     31   0
Three Years before Current Fiscal Year, Gross Charge-offs     22   31
Four Years before Current Fiscal Year, Gross Charge-offs     0   6
More than Four Years before Current Fiscal Year, Gross Charge-offs     24   8
Revolving, Gross Charge-offs     0   0
Loans, Gross Charge-offs 38 $ 1 77 $ 13 51
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member] | Performing Financial Instruments [Member]          
Current Fiscal Year 4,101   4,101   9,618
Fiscal Year before Current Fiscal Year 3,866   3,866   4,695
Two Years before Current Fiscal Year 3,615   3,615   4,853
Three Years before Current Fiscal Year 3,872   3,872   502
Four Years before Current Fiscal Year 284   284   2,541
More than Four Years before Current Fiscal Year 4,848   4,848   4,069
Revolving 20,370   20,370   17,505
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 40,956   40,956   43,783
Consumer Borrower [Member] | Consumer Portfolio Segment [Member] | Consumer, Other [Member] | Nonperforming Financial Instruments [Member]          
Current Fiscal Year 0   0   0
Fiscal Year before Current Fiscal Year 9   9   11
Two Years before Current Fiscal Year 39   39   272
Three Years before Current Fiscal Year 0   0   0
Four Years before Current Fiscal Year 0   0   7
More than Four Years before Current Fiscal Year 0   0   49
Revolving 0   0   0
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss $ 48   $ 48   $ 339