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Note 8 - Loans - Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year (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 year $ 2,563,869   $ 2,563,869   $ 2,545,564
Originated prior year 2,278,005   2,278,005   3,349,730
Originated two years prior 3,053,724   3,053,724   3,168,851
Originated three years prior 2,870,930   2,870,930   2,593,759
Originated four years prior 2,345,974   2,345,974   1,364,973
Originated years prior 4,551,491   4,551,491   4,069,831
Revolving 2,401,169   2,401,169   2,248,231
Converted to Term 24,567   24,567   24,475
Loans 20,089,729   20,089,729   19,365,414
Doubtful 20,089,729   20,089,729   19,365,414
Current year, write offs     0   188
Prior year, write offs     162   1,586
Two years prior, write offs     398   3,166
Three years prior, write offs     416   9,009
Four years prior, write offs     5,342   553
Years prior, write offs     13,362   4,237
Revolving, write offs     12,181   12,733
Converted to term, write offs     0   0
Loans, write offs 16,487 $ 4,478 31,861 $ 14,928 31,472
Commercial Portfolio Segment [Member]          
Originated current year 259,720   259,720   402,743
Originated prior year 260,467   260,467   259,797
Originated two years prior 239,489   239,489   216,034
Originated three years prior 165,406   165,406   211,728
Originated four years prior 169,165   169,165   58,833
Originated years prior 132,818   132,818   102,119
Revolving 1,973,694   1,973,694   1,835,445
Converted to Term 7,182   7,182   8,026
Loans 3,207,941   3,207,941   3,094,725
Doubtful 3,207,941   3,207,941   3,094,725
Current year, write offs     0   188
Prior year, write offs     88   1,586
Two years prior, write offs     398   3,151
Three years prior, write offs     416   8,950
Four years prior, write offs     4,412   257
Years prior, write offs     10,139   64
Revolving, write offs     12,181   12,730
Converted to term, write offs     0   0
Loans, write offs 16,173 2,666 27,634 12,862 26,926
Commercial Portfolio Segment [Member] | Pass [Member]          
Originated current year 256,492   256,492   400,836
Originated prior year 214,742   214,742   237,303
Originated two years prior 220,140   220,140   203,190
Originated three years prior 153,970   153,970   201,837
Originated four years prior 168,737   168,737   27,359
Originated years prior 108,837   108,837   90,724
Revolving 1,824,424   1,824,424   1,675,260
Converted to Term 6,729   6,729   7,804
Loans 2,954,071   2,954,071   2,844,313
Doubtful 2,954,071   2,954,071   2,844,313
Commercial Portfolio Segment [Member] | Special Mention [Member]          
Originated current year 3,228   3,228   0
Originated prior year 36,059   36,059   17,424
Originated two years prior 0   0   740
Originated three years prior 1,601   1,601   0
Originated four years prior 417   417   9,117
Originated years prior 3,973   3,973   5,139
Revolving 114,509   114,509   92,632
Converted to Term 0   0   0
Loans 159,787   159,787   125,052
Doubtful 159,787   159,787   125,052
Commercial Portfolio Segment [Member] | Substandard [Member]          
Originated current year 0   0   50
Originated prior year 9,666   9,666   5,070
Originated two years prior 19,349   19,349   12,104
Originated three years prior 7,700   7,700   6,773
Originated four years prior 11   11   22,357
Originated years prior 19,688   19,688   6,256
Revolving 34,761   34,761   67,553
Converted to Term 453   453   222
Loans 91,628   91,628   120,385
Doubtful 91,628   91,628   120,385
Commercial Portfolio Segment [Member] | Doubtful [Member]          
Originated current year 0   0   1,857
Originated prior year 0   0   0
Originated two years prior 0   0   0
Originated three years prior 2,135   2,135   3,118
Originated four years prior 0   0   0
Originated years prior 320   320   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 2,455   2,455   4,975
Doubtful 2,455   2,455   4,975
Real Estate Construction Portfolio Segment [Member]          
Originated current year 69,969   69,969   22,562
Originated prior year 63,967   63,967   60,065
Originated two years prior 66,726   66,726   126,200
Originated three years prior 89,739   89,739   93,115
Originated four years prior 56,260   56,260   16,858
Originated years prior 6,636   6,636   0
Revolving 1,177   1,177   0
Converted to Term 0   0   0
Loans 354,474   354,474   318,800
Doubtful 354,474   354,474   318,800
Current year, write offs     0   0
Prior year, write offs     0   0
Two years prior, write offs     0   0
Three years prior, write offs     0   0
Four years prior, write offs     0   0
Years prior, write offs     0   0
Revolving, write offs     0   0
Converted to term, write offs     0   0
Loans, write offs (0) (0) 0 (0) 0
Real Estate Construction Portfolio Segment [Member] | Pass [Member]          
Originated current year 69,969   69,969   22,562
Originated prior year 63,967   63,967   55,835
Originated two years prior 59,170   59,170   126,200
Originated three years prior 87,207   87,207   57,546
Originated four years prior 30,120   30,120   3,021
Originated years prior 0   0   0
Revolving 1,177   1,177   0
Converted to Term 0   0   0
Loans 311,610   311,610   265,164
Doubtful 311,610   311,610   265,164
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member]          
Originated current year 0   0   0
Originated prior year 0   0   0
Originated two years prior 7,556   7,556   0
Originated three years prior 2,532   2,532   35,569
Originated four years prior 0   0   13,837
Originated years prior 0   0   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 10,088   10,088   49,406
Doubtful 10,088   10,088   49,406
Real Estate Construction Portfolio Segment [Member] | Substandard [Member]          
Originated current year 0   0   0
Originated prior year 0   0   4,230
Originated two years prior 0   0   0
Originated three years prior 0   0   0
Originated four years prior 26,140   26,140   0
Originated years prior 6,636   6,636   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 32,776   32,776   4,230
Doubtful 32,776   32,776   4,230
Commercial Real Estate Portfolio Segment [Member]          
Originated current year 1,454,491   1,454,491   1,472,030
Originated prior year 1,426,818   1,426,818   2,006,936
Originated two years prior 1,814,143   1,814,143   1,807,297
Originated three years prior 1,674,058   1,674,058   1,502,515
Originated four years prior 1,412,766   1,412,766   832,435
Originated years prior 2,482,585   2,482,585   2,206,768
Revolving 209,280   209,280   198,485
Converted to Term 1,528   1,528   0
Loans 10,475,669   10,475,669   10,026,466
Doubtful 10,475,669   10,475,669   10,026,466
Current year, write offs     0   0
Prior year, write offs     0   0
Two years prior, write offs     0   0
Three years prior, write offs     0   0
Four years prior, write offs     930   296
Years prior, write offs     3,223   4,173
Revolving, write offs     0   0
Converted to term, write offs     0   0
Loans, write offs 314 1,746 4,153 1,997 4,469
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]          
Originated current year 1,429,454   1,429,454   1,463,225
Originated prior year 1,384,602   1,384,602   1,987,280
Originated two years prior 1,762,220   1,762,220   1,724,563
Originated three years prior 1,540,316   1,540,316   1,428,124
Originated four years prior 1,312,358   1,312,358   800,645
Originated years prior 2,329,200   2,329,200   2,108,143
Revolving 182,836   182,836   180,394
Converted to Term 0   0   0
Loans 9,940,986   9,940,986   9,692,374
Doubtful 9,940,986   9,940,986   9,692,374
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]          
Originated current year 22,430   22,430   8,805
Originated prior year 27,236   27,236   8,292
Originated two years prior 37,705   37,705   28,465
Originated three years prior 81,451   81,451   16,462
Originated four years prior 50,152   50,152   24,844
Originated years prior 42,896   42,896   19,888
Revolving 21,310   21,310   9,939
Converted to Term 0   0   0
Loans 283,180   283,180   116,695
Doubtful 283,180   283,180   116,695
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]          
Originated current year 2,607   2,607   0
Originated prior year 14,980   14,980   11,364
Originated two years prior 14,218   14,218   54,269
Originated three years prior 52,291   52,291   57,929
Originated four years prior 50,256   50,256   6,946
Originated years prior 92,238   92,238   78,737
Revolving 5,134   5,134   8,152
Converted to Term 1,528   1,528   0
Loans 233,252   233,252   217,397
Doubtful 233,252   233,252   217,397
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]          
Originated current year 0   0    
Originated prior year 0   0    
Originated two years prior 0   0    
Originated three years prior 0   0    
Originated four years prior 0   0    
Originated years prior 18,251   18,251    
Revolving 0   0    
Converted to Term 0   0    
Loans 18,251   18,251    
Doubtful 18,251   18,251    
Residential Portfolio Segment [Member]          
Originated current year 777,911   777,911   642,965
Originated prior year 525,350   525,350   1,022,932
Originated two years prior 933,366   933,366   1,019,204
Originated three years prior 941,647   941,647   786,401
Originated four years prior 707,783   707,783   456,847
Originated years prior 1,929,452   1,929,452   1,760,944
Revolving 0   0   0
Converted to Term 0   0   0
Loans 5,815,509   5,815,509   5,689,293
Doubtful 5,815,509   5,815,509   5,689,293
Current year, write offs     0   0
Prior year, write offs     74   0
Two years prior, write offs     0   0
Three years prior, write offs     0   59
Four years prior, write offs     0   0
Years prior, write offs     0   0
Revolving, write offs     0   0
Converted to term, write offs     0   0
Loans, write offs     74   59
Residential Portfolio Segment [Member] | Pass [Member]          
Originated current year 777,862   777,862   642,568
Originated prior year 523,181   523,181   1,020,419
Originated two years prior 930,890   930,890   1,014,842
Originated three years prior 932,702   932,702   781,218
Originated four years prior 702,965   702,965   452,623
Originated years prior 1,907,279   1,907,279   1,745,923
Revolving 0   0   0
Converted to Term 0   0   0
Loans 5,774,879   5,774,879   5,657,593
Doubtful 5,774,879   5,774,879   5,657,593
Residential Portfolio Segment [Member] | Special Mention [Member]          
Originated current year 0   0   0
Originated prior year 0   0   0
Originated two years prior 0   0   0
Originated three years prior 0   0   0
Originated four years prior 0   0   33
Originated years prior 1,596   1,596   1,585
Revolving 0   0   0
Converted to Term 0   0   0
Loans 1,596   1,596   1,618
Doubtful 1,596   1,596   1,618
Residential Portfolio Segment [Member] | Substandard [Member]          
Originated current year 49   49   397
Originated prior year 2,169   2,169   2,513
Originated two years prior 2,476   2,476   4,362
Originated three years prior 8,945   8,945   5,183
Originated four years prior 4,818   4,818   4,191
Originated years prior 20,577   20,577   13,436
Revolving 0   0   0
Converted to Term 0   0   0
Loans 39,034   39,034   30,082
Doubtful 39,034   39,034   30,082
Equity Lines Portfolio Segment [Member]          
Originated current year 0   0   0
Originated prior year 0   0   0
Originated two years prior 0   0   72
Originated three years prior 0   0   0
Originated four years prior 0   0   0
Originated years prior 0   0   0
Revolving 217,018   217,018   214,301
Converted to Term 15,857   15,857   16,449
Loans 232,875   232,875   230,822
Doubtful 232,875   232,875   230,822
Current year, write offs     0   0
Prior year, write offs     0   0
Two years prior, write offs     0   0
Three years prior, write offs     0   0
Four years prior, write offs     0   0
Years prior, write offs     0   0
Revolving, write offs     0   3
Converted to term, write offs     0   0
Loans, write offs     0   3
Equity Lines Portfolio Segment [Member] | Pass [Member]          
Originated current year 0   0   0
Originated prior year 0   0   0
Originated two years prior 0   0   72
Originated three years prior 0   0   0
Originated four years prior 0   0   0
Originated years prior 0   0   0
Revolving 214,160   214,160   211,374
Converted to Term 15,620   15,620   16,277
Loans 229,780   229,780   227,723
Doubtful 229,780   229,780   227,723
Equity Lines Portfolio Segment [Member] | Special Mention [Member]          
Originated current year         0
Originated prior year         0
Originated two years prior         0
Originated three years prior         0
Originated four years prior         0
Originated years prior         0
Revolving         0
Converted to Term         11
Loans         11
Doubtful         11
Equity Lines Portfolio Segment [Member] | Substandard [Member]          
Originated current year 0   0   0
Originated prior year 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 years prior 0   0   0
Revolving 2,858   2,858   2,927
Converted to Term 237   237   161
Loans 3,095   3,095   3,088
Doubtful 3,095   3,095   3,088
Installment and Other Loans [Member ]          
Originated current year 1,778   1,778   5,264
Originated prior year 1,403   1,403   0
Originated two years prior 0   0   44
Originated three years prior 80   80   0
Originated four years prior 0   0   0
Originated years prior 0   0   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 3,261   3,261   5,308
Doubtful 3,261   3,261   5,308
Current year, write offs     0   0
Prior year, write offs     0   0
Two years prior, write offs     0   15
Three years prior, write offs     0   0
Four years prior, write offs     0   0
Years prior, write offs     0   0
Revolving, write offs     0   0
Converted to term, write offs     0   0
Loans, write offs (0) $ 7 0 $ 7 15
Installment and Other Loans [Member ] | Pass [Member]          
Originated current year 1,778   1,778   5,264
Originated prior year 1,403   1,403   0
Originated two years prior 0   0   44
Originated three years prior 80   80   0
Originated four years prior 0   0   0
Originated years prior 0   0   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 3,261   3,261   5,308
Doubtful $ 3,261   $ 3,261   $ 5,308