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Note 5 - Loans and Leases - Credit Risk Profile (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Notes receivable, gross $ 1,697,028 [1]   $ 1,685,098 [2]
Current period gross write-offs 226 $ 303  
Commercial Portfolio Segment [Member]      
Current period gross write-offs 114 170  
Commercial Portfolio Segment [Member] | Commercial [Member]      
Current year 5,443   30,328
Year two 29,235   19,712
Year three 18,714   23,124
Year four 21,990   4,868
Year five 4,995   6,975
Prior 19,309   12,535
Revolving loans 53,267   55,098
Revolving loans converted to term 0   0
Notes receivable, gross 152,953 [1]   152,640 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   300
Current period gross write-offs, year four 30   20
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 84   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 114   320
Commercial Portfolio Segment [Member] | Municipal [Member]      
Current year 16,861   27,016
Year two 26,778   13,933
Year three 15,758   21,241
Year four 21,783   13,137
Year five 12,996   1,445
Prior 18,882   17,952
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 113,058 [1]   94,724 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   0
Commercial Portfolio Segment [Member] | Pass [Member] | Commercial [Member]      
Current year 5,443   30,328
Year two 29,235   19,115
Year three 18,316   22,820
Year four 15,459   4,848
Year five 4,978   6,922
Prior 18,956   12,156
Revolving loans 52,436   53,758
Revolving loans converted to term 0   0
Notes receivable, gross 144,823   149,947
Commercial Portfolio Segment [Member] | Pass [Member] | Municipal [Member]      
Current year 16,861   27,016
Year two 26,778   13,933
Year three 15,758   21,241
Year four 21,783   13,137
Year five 12,996   1,445
Prior 18,882   17,952
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 113,058   94,724
Commercial Portfolio Segment [Member] | Special Mention [Member] | Commercial [Member]      
Current year 0   0
Year two 0   597
Year three 139   288
Year four 193   0
Year five 0   0
Prior 0   55
Revolving loans 0   30
Revolving loans converted to term 0   0
Notes receivable, gross 332   970
Commercial Portfolio Segment [Member] | Special Mention [Member] | Municipal [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Portfolio Segment [Member] | Substandard [Member] | Commercial [Member]      
Current year 0   0
Year two 0   0
Year three 259   16
Year four 6,338   20
Year five 17   53
Prior 353   324
Revolving loans 831   1,310
Revolving loans converted to term 0   0
Notes receivable, gross 7,798   1,723
Commercial Portfolio Segment [Member] | Substandard [Member] | Municipal [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Portfolio Segment [Member] | Doubtful [Member] | Commercial [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Portfolio Segment [Member] | Doubtful [Member] | Municipal [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Consumer Portfolio Segment [Member]      
Current period gross write-offs 107 101  
Consumer Portfolio Segment [Member] | Home Equity Loan [Member]      
Current year 1,416   8,581
Year two 8,372   17,890
Year three 17,214   9,487
Year four 9,081   7,988
Year five 7,501   3,832
Prior 12,042   8,862
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 55,626 [1]   56,640 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   26
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   26
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Performing Financial Instruments [Member]      
Current year 1,416   8,581
Year two 8,372   17,890
Year three 17,214   9,487
Year four 9,081   7,988
Year five 7,501   3,832
Prior 11,963   8,792
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 55,547   56,570
Consumer Portfolio Segment [Member] | Home Equity Loan [Member] | Nonperforming Financial Instruments [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 79   70
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 79   70
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 41,863   41,303
Revolving loans converted to term 10,701   11,045
Notes receivable, gross 52,564 [1]   52,348 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   0
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Performing Financial Instruments [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 41,497   40,939
Revolving loans converted to term 10,701   11,045
Notes receivable, gross 52,198   51,984
Consumer Portfolio Segment [Member] | Home Equity Line of Credit [Member] | Nonperforming Financial Instruments [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 366   364
Revolving loans converted to term 0   0
Notes receivable, gross 366   364
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Recourse [Member]      
Current year 1,236   3,120
Year two 3,029   1,957
Year three 1,779   2,834
Year four 2,540   1,926
Year five 1,678   765
Prior 718   154
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 10,980 [1]   10,756 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonrecourse [Member]      
Current year 1,375   39,673
Year two 36,683   42,059
Year three 38,453   17,317
Year four 15,461   8,179
Year five 6,823   3,999
Prior 3,827   1,368
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 102,622 [1]   112,595 [2]
Current period gross write-offs, current year 0   3
Current period gross write-offs, year two 15   7
Current period gross write-offs, year three 29   105
Current period gross write-offs, year four 6   36
Current period gross write-offs, year five 3   15
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 53   166
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Performing Financial Instruments [Member] | Recourse [Member]      
Current year 1,236   3,120
Year two 3,029   1,957
Year three 1,779   2,834
Year four 2,540   1,926
Year five 1,678   765
Prior 718   154
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 10,980   10,756
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Performing Financial Instruments [Member] | Nonrecourse [Member]      
Current year 1,375   39,673
Year two 36,683   42,059
Year three 38,441   17,314
Year four 15,457   8,162
Year five 6,823   3,999
Prior 3,808   1,349
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 102,587   112,556
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonperforming Financial Instruments [Member] | Recourse [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Consumer Portfolio Segment [Member] | Automobile Loan [Member] | Nonperforming Financial Instruments [Member] | Nonrecourse [Member]      
Current year 0   0
Year two 0   0
Year three 12   3
Year four 4   17
Year five 0   0
Prior 19   19
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 35   39
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member]      
Current year 2,852 [3]   11,569 [4]
Year two 10,252 [3]   10,728 [4]
Year three 9,776 [3]   7,522 [4]
Year four 6,580 [3]   1,660 [4]
Year five 935 [3]   83 [4]
Prior 70 [3]   0 [4]
Revolving loans 0 [3]   0 [4]
Revolving loans converted to term 0 [3]   0 [4]
Notes receivable, gross 30,465 [3]   31,562 [2],[4]
Current period gross write-offs, current year 0 [3]   0 [4]
Current period gross write-offs, year two 0 [3]   0 [4]
Current period gross write-offs, year three 0 [3]   0 [4]
Current period gross write-offs, year four 0 [3]   0 [4]
Current period gross write-offs, year five 0 [3]   0 [4]
Current period gross write-offs, prior 0 [3]   0 [4]
Current period gross write-offs, revolving 0 [3]   0 [4]
Current period gross write-offs, revolving converted to term 0 [3]   0 [4]
Current period gross write-offs 0 [3]   0 [4]
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member] | Performing Financial Instruments [Member]      
Current year 2,852 [3]   11,569 [4]
Year two 10,252 [3]   10,728 [4]
Year three 9,776 [3]   7,508 [4]
Year four 6,568 [3]   1,660 [4]
Year five 935 [3]   83 [4]
Prior 70 [3]   0 [4]
Revolving loans 0 [3]   0 [4]
Revolving loans converted to term 0 [3]   0 [4]
Notes receivable, gross 30,453 [3]   31,548 [4]
Consumer Portfolio Segment [Member] | Direct Financing Lease [Member] | Nonperforming Financial Instruments [Member]      
Current year 0 [3]   0 [4]
Year two 0 [3]   0 [4]
Year three 0 [3]   14 [4]
Year four 12 [3]   0 [4]
Year five 0 [3]   0 [4]
Prior 0 [3]   0 [4]
Revolving loans 0 [3]   0 [4]
Revolving loans converted to term 0 [3]   0 [4]
Notes receivable, gross 12 [3]   14 [4]
Consumer Portfolio Segment [Member] | Other Loan [Member]      
Current year 1,422   8,127
Year two 7,244   3,266
Year three 2,791   1,963
Year four 1,770   705
Year five 592   368
Prior 898   762
Revolving loans 1,328   1,309
Revolving loans converted to term 0   0
Notes receivable, gross 16,045 [1]   16,500 [2]
Current period gross write-offs, current year 1   125
Current period gross write-offs, year two 15   77
Current period gross write-offs, year three 10   16
Current period gross write-offs, year four 10   7
Current period gross write-offs, year five 2   17
Current period gross write-offs, prior 16   29
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 54   271
Consumer Portfolio Segment [Member] | Other Loan [Member] | Performing Financial Instruments [Member]      
Current year 1,422   8,127
Year two 7,244   3,266
Year three 2,767   1,963
Year four 1,770   705
Year five 592   368
Prior 898   762
Revolving loans 1,328   1,309
Revolving loans converted to term 0   0
Notes receivable, gross 16,021   16,500
Consumer Portfolio Segment [Member] | Other Loan [Member] | Nonperforming Financial Instruments [Member]      
Current year 0   0
Year two 0   0
Year three 24   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 24   0
Commercial Real Estate Portfolio Segment [Member]      
Current period gross write-offs 5 32  
Commercial Real Estate Portfolio Segment [Member] | Non-owner Occupied [Member]      
Current year 3,814   34,103
Year two 33,675   37,573
Year three 38,013   73,316
Year four 70,694   43,125
Year five 42,037   17,956
Prior 110,460   98,713
Revolving loans 7,269   6,779
Revolving loans converted to term 0   0
Notes receivable, gross 305,962 [1]   311,565 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   32
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   32
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied [Member]      
Current year 1,922   29,429
Year two 29,866   66,360
Year three 65,299   48,173
Year four 46,277   29,937
Year five 29,203   24,636
Prior 115,436   95,414
Revolving loans 11,391   10,450
Revolving loans converted to term 0   0
Notes receivable, gross 299,394 [1]   304,399 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 5   59
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 5   59
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]      
Current year 4,846   15,075
Year two 21,758   17,358
Year three 17,216   852
Year four 0   0
Year five 0   0
Prior 3,689   3,739
Revolving loans 964   2,799
Revolving loans converted to term 0   0
Notes receivable, gross 48,473 [1]   39,823 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   0
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Non-owner Occupied [Member]      
Current year 3,814   34,103
Year two 33,675   37,508
Year three 38,013   71,209
Year four 70,006   42,692
Year five 41,912   17,390
Prior 102,540   89,860
Revolving loans 7,269   6,779
Revolving loans converted to term 0   0
Notes receivable, gross 297,229   299,541
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Owner Occupied [Member]      
Current year 1,922   29,429
Year two 29,866   59,132
Year three 58,559   47,240
Year four 45,279   29,377
Year five 28,676   24,636
Prior 104,280   84,423
Revolving loans 10,805   9,731
Revolving loans converted to term 0   0
Notes receivable, gross 279,387   283,968
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] | Construction Loans [Member]      
Current year 4,846   15,075
Year two 21,758   17,358
Year three 17,216   852
Year four 0   0
Year five 0   0
Prior 3,689   3,739
Revolving loans 964   2,799
Revolving loans converted to term 0   0
Notes receivable, gross 48,473   39,823
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Non-owner Occupied [Member]      
Current year 0   0
Year two 0   0
Year three 0   1,044
Year four 0   304
Year five 0   0
Prior 0   1,375
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   2,723
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Owner Occupied [Member]      
Current year 0   0
Year two 0   199
Year three 0   554
Year four 486   0
Year five 0   0
Prior 0   0
Revolving loans 0   125
Revolving loans converted to term 0   0
Notes receivable, gross 486   878
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] | Construction Loans [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Non-owner Occupied [Member]      
Current year 0   0
Year two 0   65
Year three 0   1,063
Year four 688   129
Year five 125   566
Prior 7,920   7,478
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 8,733   9,301
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Owner Occupied [Member]      
Current year  
Year two 0   7,029
Year three 6,740   379
Year four 512   560
Year five 527   0
Prior 11,156   10,991
Revolving loans 586   594
Revolving loans converted to term 0   0
Notes receivable, gross 19,521   19,553
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] | Construction Loans [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Non-owner Occupied [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Owner Occupied [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] | Construction Loans [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Residential Portfolio Segment [Member]      
Current period gross write-offs (0) $ (0)  
Residential Portfolio Segment [Member] | Construction Loans [Member]      
Current year 2,212   10,733
Year two 12,642   13,084
Year three 8,601   9,267
Year four 6,420   2,675
Year five 2,665   343
Prior 634   434
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 33,174 [1]   36,536 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   0
Residential Portfolio Segment [Member] | Construction Loans [Member] | Performing Financial Instruments [Member]      
Current year 2,212   10,733
Year two 12,642   13,084
Year three 8,601   9,267
Year four 6,420   2,675
Year five 2,665   343
Prior 634   434
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 33,174   36,536
Residential Portfolio Segment [Member] | Construction Loans [Member] | Nonperforming Financial Instruments [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 0   0
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 0   0
Residential Portfolio Segment [Member] | Real Estate Loan [Member]      
Current year 9,706   53,604
Year two 52,897   80,516
Year three 84,935   137,620
Year four 139,372   51,710
Year five 51,022   29,859
Prior 137,780   111,701
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 475,712 [1]   465,010 [2]
Current period gross write-offs, current year 0   0
Current period gross write-offs, year two 0   0
Current period gross write-offs, year three 0   0
Current period gross write-offs, year four 0   0
Current period gross write-offs, year five 0   0
Current period gross write-offs, prior 0   0
Current period gross write-offs, revolving 0   0
Current period gross write-offs, revolving converted to term 0   0
Current period gross write-offs 0   0
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Performing Financial Instruments [Member]      
Current year 9,706   53,604
Year two 52,897   80,516
Year three 84,935   137,620
Year four 139,372   51,710
Year five 51,022   29,859
Prior 137,342   111,423
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross 475,274   464,732
Residential Portfolio Segment [Member] | Real Estate Loan [Member] | Nonperforming Financial Instruments [Member]      
Current year 0   0
Year two 0   0
Year three 0   0
Year four 0   0
Year five 0   0
Prior 438   278
Revolving loans 0   0
Revolving loans converted to term 0   0
Notes receivable, gross $ 438   $ 278
[1] Includes net deferred loan costs of $5.0 million.
[2] Includes net deferred loan costs of $4.9 million.
[3] Net of unearned lease revenue of $2.1 million.
[4] Net of unearned lease revenue of $2.0 million.