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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 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Originated Current Fiscal Year $ 383,330   $ 383,330   $ 511,688
Originated One Year Prior 616,576   616,576   443,185
Originated Two Years Prior 562,449   562,449   1,724,765
Originated Three Years Prior 2,309,325   2,309,325   1,782,673
Originated Four Years Prior 2,271,967   2,271,967   397,679
Originated Five or More Years Prior 3,161,785   3,161,785   1,685,185
Revolving Loans 1,863,706   1,863,706   1,735,307
Gross loans 11,169,138   11,169,138   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     6,049   10,732
Gross write-off, revolving     876   1,918
Gross write-off 5,039 $ 3,595 8,594 $ 6,780 13,702
Pass [Member]          
Originated Current Fiscal Year 383,330   383,330   509,780
Originated One Year Prior 610,629   610,629   440,166
Originated Two Years Prior 558,592   558,592   1,660,146
Originated Three Years Prior 2,241,444   2,241,444   1,778,072
Originated Four Years Prior 2,260,258   2,260,258   393,127
Originated Five or More Years Prior 3,001,965   3,001,965   1,566,356
Revolving Loans 1,840,368   1,840,368   1,711,061
Gross loans 10,896,586   10,896,586   8,058,708
Special Mention [Member]          
Originated Current Fiscal Year 0   0   1,908
Originated One Year Prior 5,947   5,947   0
Originated Two Years Prior 0   0   56,459
Originated Three Years Prior 47,604   47,604   2,538
Originated Four Years Prior 841   841   1,643
Originated Five or More Years Prior 83,103   83,103   66,563
Revolving Loans 3,346   3,346   20,264
Gross loans 140,841   140,841   149,375
Substandard [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 0   0   3,019
Originated Two Years Prior 3,857   3,857   8,160
Originated Three Years Prior 20,277   20,277   2,063
Originated Four Years Prior 10,868   10,868   2,909
Originated Five or More Years Prior 76,717   76,717   52,266
Revolving Loans 19,992   19,992   3,982
Gross loans 131,711   131,711   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 61,680   61,680   69,206
Originated One Year Prior 89,019   89,019   160,086
Originated Two Years Prior 146,491   146,491   201,124
Originated Three Years Prior 200,901   200,901   239,820
Originated Four Years Prior 230,960   230,960   31,360
Originated Five or More Years Prior 147,606   147,606   133,894
Revolving Loans 730,871   730,871   697,240
Gross loans 1,607,528   1,607,528   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     467   316
Gross write-off, revolving     875   1,918
Gross write-off 3,011 (0) 3,011 300 3,286
Commercial Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 61,680   61,680   67,298
Originated One Year Prior 87,123   87,123   157,067
Originated Two Years Prior 142,634   142,634   194,602
Originated Three Years Prior 196,011   196,011   237,065
Originated Four Years Prior 228,357   228,357   29,717
Originated Five or More Years Prior 123,836   123,836   111,841
Revolving Loans 712,620   712,620   678,206
Gross loans 1,552,261   1,552,261   1,475,796
Commercial Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   1,908
Originated One Year Prior 1,896   1,896   0
Originated Two Years Prior 0   0   2,817
Originated Three Years Prior 314   314   2,538
Originated Four Years Prior 0   0   1,643
Originated Five or More Years Prior 4,999   4,999   6,209
Revolving Loans 596   596   17,491
Gross loans 7,805   7,805   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 3,857   3,857   3,705
Originated Three Years Prior 4,576   4,576   217
Originated Four Years Prior 2,603   2,603   0
Originated Five or More Years Prior 18,771   18,771   15,844
Revolving Loans 17,655   17,655   1,543
Gross loans 47,462   47,462   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 291,020   291,020   408,314
Originated One Year Prior 475,402   475,402   268,533
Originated Two Years Prior 376,511   376,511   1,481,673
Originated Three Years Prior 1,842,309   1,842,309   1,511,933
Originated Four Years Prior 1,873,803   1,873,803   341,305
Originated Five or More Years Prior 2,342,943   2,342,943   1,453,635
Revolving Loans 422,045   422,045   415,286
Gross loans 7,624,033   7,624,033   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     5,582   10,416
Gross write-off, revolving     0   0
Gross write-off 2,027 3,595 5,582 6,480 10,416
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 291,020   291,020   408,314
Originated One Year Prior 471,351   471,351   268,533
Originated Two Years Prior 376,511   376,511   1,424,209
Originated Three Years Prior 1,779,950   1,779,950   1,510,087
Originated Four Years Prior 1,864,697   1,864,697   339,553
Originated Five or More Years Prior 2,210,694   2,210,694   1,357,858
Revolving Loans 422,045   422,045   415,286
Gross loans 7,416,268   7,416,268   5,723,840
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]          
Originated Current Fiscal Year 0   0   0
Originated One Year Prior 4,051   4,051   0
Originated Two Years Prior 0   0   53,642
Originated Three Years Prior 47,290   47,290   0
Originated Four Years Prior 841   841   0
Originated Five or More Years Prior 77,477   77,477   59,719
Revolving Loans 0   0   0
Gross loans 129,659   129,659   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 15,069   15,069   1,846
Originated Four Years Prior 8,265   8,265   1,752
Originated Five or More Years Prior 54,772   54,772   36,058
Revolving Loans 0   0   0
Gross loans 78,106   78,106   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 487   487   15,390
Originated One Year Prior 25,440   25,440   0
Originated Two Years Prior 0   0   2,137
Originated Three Years Prior 3,663   3,663   8,995
Originated Four Years Prior 0   0   6,518
Originated Five or More Years Prior 4,362   4,362   0
Revolving Loans 647,270   647,270   583,206
Gross loans 681,222   681,222   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 487   487   15,390
Originated One Year Prior 25,440   25,440   0
Originated Two Years Prior 0   0   2,137
Originated Three Years Prior 3,663   3,663   8,995
Originated Four Years Prior 0   0   6,518
Originated Five or More Years Prior 4,362   4,362   0
Revolving Loans 645,066   645,066   581,002
Gross loans 679,018   679,018   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 0   0   0
Originated Four Years Prior 0   0   0
Originated Five or More Years Prior 0   0   0
Revolving Loans 2,204   2,204   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 28,589   28,589   17,763
Originated One Year Prior 26,696   26,696   14,542
Originated Two Years Prior 39,426   39,426   39,830
Originated Three Years Prior 262,452   262,452   21,925
Originated Four Years Prior 167,204   167,204   18,496
Originated Five or More Years Prior 666,874   666,874   97,656
Revolving Loans 63,405   63,405   39,479
Gross loans 1,254,646   1,254,646   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 28,589   28,589   17,763
Originated One Year Prior 26,696   26,696   14,542
Originated Two Years Prior 39,426   39,426   39,197
Originated Three Years Prior 261,820   261,820   21,925
Originated Four Years Prior 167,204   167,204   17,339
Originated Five or More Years Prior 663,073   663,073   96,657
Revolving Loans 60,522   60,522   36,471
Gross loans 1,247,330   1,247,330   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 627   627   635
Revolving Loans 2,750   2,750   2,773
Gross loans 3,377   3,377   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 632   632   0
Originated Four Years Prior 0   0   1,157
Originated Five or More Years Prior 3,174   3,174   364
Revolving Loans 133   133   235
Gross loans 3,939   3,939   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 1,554   1,554   1,015
Originated One Year Prior 19   19   24
Originated Two Years Prior 21   21   1
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 115   115   96
Gross loans 1,709   1,709   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 1 $ (0) 1 $ (0) 0
Consumer Portfolio Segment [Member] | Pass [Member]          
Originated Current Fiscal Year 1,554   1,554   1,015
Originated One Year Prior 19   19   24
Originated Two Years Prior 21   21   1
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 115   115   96
Gross loans 1,709   1,709   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