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Note 6 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Originated Current Fiscal Year $ 704,169   $ 704,169   $ 511,688
Originated One Year Prior 770,142   770,142   443,185
Originated Two Years Prior 556,518   556,518   1,724,765
Originated Three Years Prior 2,098,791   2,098,791   1,782,673
Originated Four Years Prior 1,880,381   1,880,381   397,679
Originated Five or More Years Prior 2,568,734   2,568,734   1,685,185
Revolving Loans 2,729,396   2,729,396   1,735,307
Gross loans 11,308,131   11,308,131   8,280,482
Gross write-off, current year     0   0
Gross write-off, one year prior     0   0
Gross write-off, two years prior     0   1,003
Gross write-off, three years prior     1,669   49
Gross write-off, four years prior     0   0
Gross write-off, five years prior     11,136   10,732
Gross write-off, revolving     962   1,918
Gross write-off 5,173 $ 3,559 13,767 $ 10,339 13,702
Pass [Member]          
Originated Current Fiscal Year 704,169   704,169   509,780
Originated One Year Prior 766,104   766,104   440,166
Originated Two Years Prior 555,132   555,132   1,660,146
Originated Three Years Prior 2,026,565   2,026,565   1,778,072
Originated Four Years Prior 1,869,725   1,869,725   393,127
Originated Five or More Years Prior 2,432,547   2,432,547   1,566,356
Revolving Loans 2,663,849   2,663,849   1,711,061
Gross loans 11,018,091   11,018,091   8,058,708
Special Mention [Member]          
Originated Current Fiscal Year 0   0   1,908
Originated One Year Prior 4,038   4,038   0
Originated Two Years Prior 0   0   56,459
Originated Three Years Prior 51,906   51,906   2,538
Originated Four Years Prior 832   832   1,643
Originated Five or More Years Prior 80,192   80,192   66,563
Revolving Loans 15,699   15,699   20,264
Gross loans 152,667   152,667   149,375
Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   3,019
Originated Two Years Prior 1,386   1,386   8,160
Originated Three Years Prior 20,320   20,320   2,063
Originated Four Years Prior 9,824   9,824   2,909
Originated Five or More Years Prior 55,995   55,995   52,266
Revolving Loans 49,848   49,848   3,982
Gross loans 137,373   137,373   72,399
Doubtful [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Commercial Portfolio Segment [Member]          
Originated Current Fiscal Year 113,951   113,951   69,206
Originated One Year Prior 202,793   202,793   160,086
Originated Two Years Prior 133,458   133,458   201,124
Originated Three Years Prior 254,870   254,870   239,820
Originated Four Years Prior 204,936   204,936   31,360
Originated Five or More Years Prior 187,543   187,543   133,894
Revolving Loans 525,424   525,424   697,240
Gross loans 1,622,975   1,622,975   1,532,730
Gross write-off, current year     0   0
Gross write-off, one year prior     0   0
Gross write-off, two years prior     0   1,003
Gross write-off, three years prior     1,669   49
Gross write-off, four years prior     0   0
Gross write-off, five years prior     854   316
Gross write-off, revolving     961   1,918
Gross write-off 473 1,923 3,484 2,223 3,286
Commercial Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 113,951   113,951   67,298
Originated One Year Prior 202,793   202,793   157,067
Originated Two Years Prior 132,072   132,072   194,602
Originated Three Years Prior 243,675   243,675   237,065
Originated Four Years Prior 202,373   202,373   29,717
Originated Five or More Years Prior 172,658   172,658   111,841
Revolving Loans 495,039   495,039   678,206
Gross loans 1,562,561   1,562,561   1,475,796
Commercial Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   1,908
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   2,817
Originated Three Years Prior 8,106   8,106   2,538
Originated Four Years Prior 0   0   1,643
Originated Five or More Years Prior 2,937   2,937   6,209
Revolving Loans 2,161   2,161   17,491
Gross loans 13,204   13,204   32,606
Commercial Portfolio Segment [Member] | Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   3,019
Originated Two Years Prior 1,386   1,386   3,705
Originated Three Years Prior 3,089   3,089   217
Originated Four Years Prior 2,563   2,563   0
Originated Five or More Years Prior 11,948   11,948   15,844
Revolving Loans 28,224   28,224   1,543
Gross loans 47,210   47,210   24,328
Commercial Portfolio Segment [Member] | Doubtful [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Commercial Real Estate Portfolio Segment [Member]          
Originated Current Fiscal Year 527,032   527,032   408,314
Originated One Year Prior 430,554   430,554   268,533
Originated Two Years Prior 309,085   309,085   1,481,673
Originated Three Years Prior 1,608,731   1,608,731   1,511,933
Originated Four Years Prior 1,441,195   1,441,195   341,305
Originated Five or More Years Prior 1,908,636   1,908,636   1,453,635
Revolving Loans 1,495,837   1,495,837   415,286
Gross loans 7,721,070   7,721,070   5,880,679
Gross write-off, current year     0   0
Gross write-off, one year prior     0   0
Gross write-off, two years prior     0   0
Gross write-off, three years prior     0   0
Gross write-off, four years prior     0   0
Gross write-off, five years prior     10,282   10,416
Gross write-off, revolving     0   0
Gross write-off 4,700 1,636 10,282 8,116 10,416
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 527,032   527,032   408,314
Originated One Year Prior 426,516   426,516   268,533
Originated Two Years Prior 309,085   309,085   1,424,209
Originated Three Years Prior 1,549,904   1,549,904   1,510,087
Originated Four Years Prior 1,433,923   1,433,923   339,553
Originated Five or More Years Prior 1,788,633   1,788,633   1,357,858
Revolving Loans 1,466,701   1,466,701   415,286
Gross loans 7,501,794   7,501,794   5,723,840
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 4,038   4,038   0
Originated Two Years Prior 0   0   53,642
Originated Three Years Prior 43,800   43,800   0
Originated Four Years Prior 832   832   0
Originated Five or More Years Prior 77,255   77,255   59,719
Revolving Loans 10,178   10,178   0
Gross loans 136,103   136,103   113,361
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   3,822
Originated Three Years Prior 15,027   15,027   1,846
Originated Four Years Prior 6,440   6,440   1,752
Originated Five or More Years Prior 42,748   42,748   36,058
Revolving Loans 18,958   18,958   0
Gross loans 83,173   83,173   43,478
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Commercial Construction Portfolio Segment [Member]          
Originated Current Fiscal Year 39,599   39,599   15,390
Originated One Year Prior 114,221   114,221   0
Originated Two Years Prior 79,679   79,679   2,137
Originated Three Years Prior 32,730   32,730   8,995
Originated Four Years Prior 116,812   116,812   6,518
Originated Five or More Years Prior 59,786   59,786   0
Revolving Loans 285,788   285,788   583,206
Gross loans 728,615   728,615   616,246
Gross write-off, current year     0   0
Gross write-off, one year prior     0   0
Gross write-off, two years prior     0   0
Gross write-off, three years prior     0   0
Gross write-off, four years prior     0   0
Gross write-off, five years prior     0   0
Gross write-off, revolving     0   0
Gross write-off (0) (0) 0 (0) 0
Commercial Construction Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 39,599   39,599   15,390
Originated One Year Prior 114,221   114,221   0
Originated Two Years Prior 79,679   79,679   2,137
Originated Three Years Prior 30,526   30,526   8,995
Originated Four Years Prior 116,812   116,812   6,518
Originated Five or More Years Prior 59,786   59,786   0
Revolving Loans 285,788   285,788   581,002
Gross loans 726,411   726,411   614,042
Commercial Construction Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Commercial Construction Portfolio Segment [Member] | Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 2,204   2,204   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   2,204
Gross loans 2,204   2,204   2,204
Commercial Construction Portfolio Segment [Member] | Doubtful [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Residential Portfolio Segment [Member]          
Originated Current Fiscal Year 21,574   21,574   17,763
Originated One Year Prior 22,564   22,564   14,542
Originated Two Years Prior 34,296   34,296   39,830
Originated Three Years Prior 202,460   202,460   21,925
Originated Four Years Prior 117,438   117,438   18,496
Originated Five or More Years Prior 412,717   412,717   97,656
Revolving Loans 422,256   422,256   39,479
Gross loans 1,233,305   1,233,305   249,691
Gross write-off, current year     0   0
Gross write-off, one year prior     0   0
Gross write-off, two years prior     0   0
Gross write-off, three years prior     0   0
Gross write-off, four years prior     0   0
Gross write-off, five years prior     0   0
Gross write-off, revolving     0   0
Gross write-off (0) (0) 0 (0) 0
Residential Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 21,574   21,574   17,763
Originated One Year Prior 22,564   22,564   14,542
Originated Two Years Prior 34,296   34,296   39,197
Originated Three Years Prior 202,460   202,460   21,925
Originated Four Years Prior 116,617   116,617   17,339
Originated Five or More Years Prior 411,418   411,418   96,657
Revolving Loans 416,230   416,230   36,471
Gross loans 1,225,159   1,225,159   243,894
Residential Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   635
Revolving Loans 3,360   3,360   2,773
Gross loans 3,360   3,360   3,408
Residential Portfolio Segment [Member] | Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   633
Originated Three Years Prior 0   0   0
Originated Four Years Prior 821   821   1,157
Originated Five or More Years Prior 1,299   1,299   364
Revolving Loans 2,666   2,666   235
Gross loans 4,786   4,786   2,389
Residential Portfolio Segment [Member] | Doubtful [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Consumer Portfolio Segment [Member]          
Originated Current Fiscal Year 2,013   2,013   1,015
Originated One Year Prior 10   10   24
Originated Two Years Prior 0   0   1
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 52   52   0
Revolving Loans 91   91   96
Gross loans 2,166   2,166   1,136
Gross write-off, current year     0   0
Gross write-off, one year prior     0   0
Gross write-off, two years prior     0   0
Gross write-off, three years prior     0   0
Gross write-off, four years prior     0   0
Gross write-off, five years prior     0   0
Gross write-off, revolving     1   0
Gross write-off (0) $ (0) 1 $ (0) 0
Consumer Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 2,013   2,013   1,015
Originated One Year Prior 10   10   24
Originated Two Years Prior 0   0   1
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 52   52   0
Revolving Loans 91   91   96
Gross loans 2,166   2,166   1,136
Consumer Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Consumer Portfolio Segment [Member] | Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans 0   0   0
Consumer Portfolio Segment [Member] | Doubtful [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   0
Originated Two Years Prior 0   0   0
Originated Three Years Prior 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 0   0   0
Gross loans $ 0   $ 0   $ 0