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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 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Originated Current Fiscal Year $ 152,948   $ 511,688
Originated One Year Prior 500,657   443,185
Originated Two Years Prior 436,761   1,724,765
Originated Three Years Prior 1,694,906   1,782,673
Originated Four Years Prior 1,737,754   397,679
Originated Five or More Years Prior 2,030,187   1,685,185
Revolving Loans 1,653,130   1,735,307
Gross loans 8,206,343   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 0   49
Gross write-off, four years prior 0   0
Gross write-off, five years prior 3,555   10,732
Gross write-off, revolving 0   1,918
Gross write-off 3,555 $ 3,185 13,702
Pass [Member]      
Originated Current Fiscal Year 152,948   509,780
Originated One Year Prior 498,755   440,166
Originated Two Years Prior 433,787   1,660,146
Originated Three Years Prior 1,634,861   1,778,072
Originated Four Years Prior 1,729,607   393,127
Originated Five or More Years Prior 1,895,243   1,566,356
Revolving Loans 1,629,404   1,711,061
Gross loans 7,974,605   8,058,708
Special Mention [Member]      
Originated Current Fiscal Year 0   1,908
Originated One Year Prior 1,902   0
Originated Two Years Prior 0   56,459
Originated Three Years Prior 51,717   2,538
Originated Four Years Prior 1,309   1,643
Originated Five or More Years Prior 82,047   66,563
Revolving Loans 2,762   20,264
Gross loans 139,737   149,375
Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   3,019
Originated Two Years Prior 2,974   8,160
Originated Three Years Prior 8,328   2,063
Originated Four Years Prior 6,838   2,909
Originated Five or More Years Prior 52,897   52,266
Revolving Loans 20,964   3,982
Gross loans 92,001   72,399
Doubtful [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Commercial Portfolio Segment [Member]      
Originated Current Fiscal Year 28,946   69,206
Originated One Year Prior 64,048   160,086
Originated Two Years Prior 154,191   201,124
Originated Three Years Prior 196,873   239,820
Originated Four Years Prior 232,796   31,360
Originated Five or More Years Prior 155,018   133,894
Revolving Loans 661,048   697,240
Gross loans 1,492,920   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 0   49
Gross write-off, four years prior 0   0
Gross write-off, five years prior 0   316
Gross write-off, revolving 0   1,918
Gross write-off 0 300 3,286
Commercial Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 28,946   67,298
Originated One Year Prior 62,146   157,067
Originated Two Years Prior 151,217   194,602
Originated Three Years Prior 190,275   237,065
Originated Four Years Prior 230,187   29,717
Originated Five or More Years Prior 129,297   111,841
Revolving Loans 642,514   678,206
Gross loans 1,434,582   1,475,796
Commercial Portfolio Segment [Member] | Special Mention [Member]      
Originated Current Fiscal Year 0   1,908
Originated One Year Prior 1,902   0
Originated Two Years Prior 0   2,817
Originated Three Years Prior 351   2,538
Originated Four Years Prior 0   1,643
Originated Five or More Years Prior 6,681   6,209
Revolving Loans 0   17,491
Gross loans 8,934   32,606
Commercial Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   3,019
Originated Two Years Prior 2,974   3,705
Originated Three Years Prior 6,247   217
Originated Four Years Prior 2,609   0
Originated Five or More Years Prior 19,040   15,844
Revolving Loans 18,534   1,543
Gross loans 49,404   24,328
Commercial Portfolio Segment [Member] | Doubtful [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Commercial Real Estate Portfolio Segment [Member]      
Originated Current Fiscal Year 113,550   408,314
Originated One Year Prior 390,234   268,533
Originated Two Years Prior 268,061   1,481,673
Originated Three Years Prior 1,456,301   1,511,933
Originated Four Years Prior 1,474,246   341,305
Originated Five or More Years Prior 1,756,487   1,453,635
Revolving Loans 378,792   415,286
Gross loans 5,837,671   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 3,555   10,416
Gross write-off, revolving 0   0
Gross write-off 3,555 2,885 10,416
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 113,550   408,314
Originated One Year Prior 390,234   268,533
Originated Two Years Prior 268,061   1,424,209
Originated Three Years Prior 1,403,487   1,510,087
Originated Four Years Prior 1,468,708   339,553
Originated Five or More Years Prior 1,649,401   1,357,858
Revolving Loans 378,792   415,286
Gross loans 5,672,233   5,723,840
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   53,642
Originated Three Years Prior 51,366   0
Originated Four Years Prior 1,309   0
Originated Five or More Years Prior 74,735   59,719
Revolving Loans 0   0
Gross loans 127,410   113,361
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   3,822
Originated Three Years Prior 1,448   1,846
Originated Four Years Prior 4,229   1,752
Originated Five or More Years Prior 32,351   36,058
Revolving Loans 0   0
Gross loans 38,028   43,478
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Commercial Construction Portfolio Segment [Member]      
Originated Current Fiscal Year 0   15,390
Originated One Year Prior 25,440   0
Originated Two Years Prior 0   2,137
Originated Three Years Prior 2,137   8,995
Originated Four Years Prior 8,954   6,518
Originated Five or More Years Prior 6,236   0
Revolving Loans 574,826   583,206
Gross loans 617,593   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
Commercial Construction Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 0   15,390
Originated One Year Prior 25,440   0
Originated Two Years Prior 0   2,137
Originated Three Years Prior 2,137   8,995
Originated Four Years Prior 8,954   6,518
Originated Five or More Years Prior 6,236   0
Revolving Loans 572,622   581,002
Gross loans 615,389   614,042
Commercial Construction Portfolio Segment [Member] | Special Mention [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Commercial Construction Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 2,204   2,204
Gross loans 2,204   2,204
Commercial Construction Portfolio Segment [Member] | Doubtful [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Residential Portfolio Segment [Member]      
Originated Current Fiscal Year 8,979   17,763
Originated One Year Prior 20,915   14,542
Originated Two Years Prior 14,486   39,830
Originated Three Years Prior 39,594   21,925
Originated Four Years Prior 21,758   18,496
Originated Five or More Years Prior 112,446   97,656
Revolving Loans 38,377   39,479
Gross loans 256,555   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
Residential Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 8,979   17,763
Originated One Year Prior 20,915   14,542
Originated Two Years Prior 14,486   39,197
Originated Three Years Prior 38,961   21,925
Originated Four Years Prior 21,758   17,339
Originated Five or More Years Prior 110,309   96,657
Revolving Loans 35,389   36,471
Gross loans 250,797   243,894
Residential Portfolio Segment [Member] | Special Mention [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 631   635
Revolving Loans 2,762   2,773
Gross loans 3,393   3,408
Residential Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   633
Originated Three Years Prior 633   0
Originated Four Years Prior 0   1,157
Originated Five or More Years Prior 1,506   364
Revolving Loans 226   235
Gross loans 2,365   2,389
Residential Portfolio Segment [Member] | Doubtful [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Consumer Portfolio Segment [Member]      
Originated Current Fiscal Year 1,473   1,015
Originated One Year Prior 20   24
Originated Two Years Prior 23   1
Originated Three Years Prior 1   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 87   96
Gross loans 1,604   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 0   0
Gross write-off 0 $ (0) 0
Consumer Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 1,473   1,015
Originated One Year Prior 20   24
Originated Two Years Prior 23   1
Originated Three Years Prior 1   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 87   96
Gross loans 1,604   1,136
Consumer Portfolio Segment [Member] | Special Mention [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Consumer Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans 0   0
Consumer Portfolio Segment [Member] | Doubtful [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   0
Originated Two Years Prior 0   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 0   0
Revolving Loans 0   0
Gross loans $ 0   $ 0