v3.26.1
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, 2026
Mar. 31, 2025
Dec. 31, 2025
Originated Current Fiscal Year $ 412,053   $ 1,442,449
Originated One Year Prior 1,465,361   762,181
Originated Two Years Prior 741,624   513,243
Originated Three Years Prior 523,550   1,989,079
Originated Four Years Prior 1,903,210   1,763,604
Originated Five or More Years Prior 4,032,636   2,395,879
Revolving Loans 2,660,659   2,591,123
Gross loans 11,739,093   11,457,558
Gross write-off, current year 0   25
Gross write-off, one year prior 0   0
Gross write-off, two years prior 39   32
Gross write-off, three years prior 0   1,669
Gross write-off, four years prior 1,005   0
Gross write-off, five years prior 5,642   14,693
Gross write-off, revolving 437   2,962
Gross write-off 7,123 $ 3,555 19,381
Pass [Member]      
Originated Current Fiscal Year 406,160   1,442,303
Originated One Year Prior 1,465,215   757,618
Originated Two Years Prior 737,614   510,195
Originated Three Years Prior 520,527   1,923,801
Originated Four Years Prior 1,841,552   1,747,400
Originated Five or More Years Prior 3,890,145   2,253,581
Revolving Loans 2,613,157   2,537,941
Gross loans 11,474,370   11,172,839
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   39,965
Originated Four Years Prior 36,631   3,741
Originated Five or More Years Prior 74,611   74,379
Revolving Loans 3,562   10,385
Gross loans 114,804   128,470
Substandard [Member]      
Originated Current Fiscal Year 5,893   146
Originated One Year Prior 146   4,563
Originated Two Years Prior 4,010   3,048
Originated Three Years Prior 3,023   25,313
Originated Four Years Prior 25,027   12,463
Originated Five or More Years Prior 67,880   67,919
Revolving Loans 43,940   42,797
Gross loans 149,919   156,249
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 52,710   166,088
Originated One Year Prior 181,414   194,609
Originated Two Years Prior 207,276   140,229
Originated Three Years Prior 119,249   221,318
Originated Four Years Prior 222,613   180,314
Originated Five or More Years Prior 359,858   158,725
Revolving Loans 501,716   504,680
Gross loans 1,644,836   1,565,963
Gross write-off, current year 0   0
Gross write-off, one year prior 0   0
Gross write-off, two years prior 39   32
Gross write-off, three years prior 0   1,669
Gross write-off, four years prior 0   0
Gross write-off, five years prior 0   854
Gross write-off, revolving 437   1,961
Gross write-off 476 (0) 4,516
Commercial Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 46,817   165,942
Originated One Year Prior 181,268   194,070
Originated Two Years Prior 207,276   137,181
Originated Three Years Prior 116,226   217,504
Originated Four Years Prior 218,823   177,715
Originated Five or More Years Prior 342,707   145,173
Revolving Loans 487,902   479,906
Gross loans 1,601,019   1,517,491
Commercial 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   694
Originated Four Years Prior 692   0
Originated Five or More Years Prior 76   2,927
Revolving Loans 44   44
Gross loans 812   3,665
Commercial Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 5,893   146
Originated One Year Prior 146   539
Originated Two Years Prior 0   3,048
Originated Three Years Prior 3,023   3,120
Originated Four Years Prior 3,098   2,599
Originated Five or More Years Prior 17,075   10,625
Revolving Loans 13,770   24,730
Gross loans 43,005   44,807
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 328,358   1,129,223
Originated One Year Prior 1,135,353   420,830
Originated Two Years Prior 393,194   303,121
Originated Three Years Prior 296,057   1,548,498
Originated Four Years Prior 1,527,264   1,404,550
Originated Five or More Years Prior 3,061,601   1,774,365
Revolving Loans 1,577,017   1,474,109
Gross loans 8,318,844   8,054,696
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 1,005   0
Gross write-off, five years prior 5,642   13,839
Gross write-off, revolving 0   0
Gross write-off 6,647 3,555 13,839
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 328,358   1,129,223
Originated One Year Prior 1,135,353   416,806
Originated Two Years Prior 389,184   303,121
Originated Three Years Prior 296,057   1,487,034
Originated Four Years Prior 1,469,396   1,391,743
Originated Five or More Years Prior 2,939,126   1,648,135
Revolving Loans 1,548,996   1,451,710
Gross loans 8,106,470   7,827,772
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   0
Originated Three Years Prior 0   39,271
Originated Four Years Prior 35,939   3,741
Originated Five or More Years Prior 74,535   71,452
Revolving Loans 192   6,998
Gross loans 110,666   121,462
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]      
Originated Current Fiscal Year 0   0
Originated One Year Prior 0   4,024
Originated Two Years Prior 4,010   0
Originated Three Years Prior 0   22,193
Originated Four Years Prior 21,929   9,066
Originated Five or More Years Prior 47,940   54,778
Revolving Loans 27,829   15,401
Gross loans 101,708   105,462
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 10,565   108,660
Originated One Year Prior 111,171   120,104
Originated Two Years Prior 121,603   36,316
Originated Three Years Prior 17,858   17,912
Originated Four Years Prior 8,007   63,727
Originated Five or More Years Prior 84,078   44,193
Revolving Loans 217,791   232,990
Gross loans 571,073   623,902
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 10,565   108,660
Originated One Year Prior 111,171   120,104
Originated Two Years Prior 121,603   36,316
Originated Three Years Prior 17,858   17,912
Originated Four Years Prior 8,007   63,727
Originated Five or More Years Prior 84,078   44,193
Revolving Loans 217,791   232,990
Gross loans 571,073   623,902
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 0   0
Gross loans 0   0
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 18,788   36,615
Originated One Year Prior 37,414   26,638
Originated Two Years Prior 19,543   33,577
Originated Three Years Prior 90,386   201,351
Originated Four Years Prior 145,326   115,013
Originated Five or More Years Prior 527,025   418,533
Revolving Loans 364,057   379,253
Gross loans 1,202,539   1,210,980
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   1,000
Gross write-off 0 (0) 1,000
Residential Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 18,788   36,615
Originated One Year Prior 37,414   26,638
Originated Two Years Prior 19,543   33,577
Originated Three Years Prior 90,386   201,351
Originated Four Years Prior 145,326   114,215
Originated Five or More Years Prior 524,160   416,017
Revolving Loans 358,390   373,244
Gross loans 1,194,007   1,201,657
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 0   0
Revolving Loans 3,326   3,343
Gross loans 3,326   3,343
Residential 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   798
Originated Five or More Years Prior 2,865   2,516
Revolving Loans 2,341   2,666
Gross loans 5,206   5,980
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 1,632   1,863
Originated One Year Prior 9   0
Originated Two Years Prior 8   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 74   63
Revolving Loans 78   91
Gross loans 1,801   2,017
Gross write-off, current year 0   25
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   1
Gross write-off 0 $ (0) 26
Consumer Portfolio Segment [Member] | Pass [Member]      
Originated Current Fiscal Year 1,632   1,863
Originated One Year Prior 9   0
Originated Two Years Prior 8   0
Originated Three Years Prior 0   0
Originated Four Years Prior 0   0
Originated Five or More Years Prior 74   63
Revolving Loans 78   91
Gross loans 1,801   2,017
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