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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 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Originated current year $ 1,674,421   $ 1,674,421   $ 2,545,564
Originated prior year 2,373,720   2,373,720   3,349,730
Originated two years prior 3,160,362   3,160,362   3,168,851
Originated three years prior 2,932,953   2,932,953   2,593,759
Originated four years prior 2,404,364   2,404,364   1,364,973
Originated years prior 4,841,222   4,841,222   4,069,831
Revolving 2,357,014   2,357,014   2,248,231
Converted to Term 26,812   26,812   24,475
Loans 19,770,868   19,770,868   19,365,414
Current year, write offs     0   188
Prior year, write offs     94   1,586
Two years prior, write offs     208   3,166
Three years prior, write offs     417   9,009
Four years prior, write offs     3,094   553
Years prior, write offs     8,989   4,237
Revolving, write offs     2,572   12,733
Converted to term, write offs     0   0
Loans, write offs 13,030 $ 8,257 15,374 $ 10,450 31,472
Commercial Portfolio Segment [Member]          
Originated current year 170,446   170,446   402,743
Originated prior year 299,016   299,016   259,797
Originated two years prior 263,161   263,161   216,034
Originated three years prior 177,157   177,157   211,728
Originated four years prior 170,449   170,449   58,833
Originated years prior 155,045   155,045   102,119
Revolving 1,949,046   1,949,046   1,835,445
Converted to Term 8,082   8,082   8,026
Loans 3,192,402   3,192,402   3,094,725
Current year, write offs     0   188
Prior year, write offs     20   1,586
Two years prior, write offs     208   3,151
Three years prior, write offs     417   8,950
Four years prior, write offs     2,164   257
Years prior, write offs     6,080   64
Revolving, write offs     2,572   12,730
Converted to term, write offs     0   0
Loans, write offs 9,117 8,257 11,461 10,196 26,926
Commercial Portfolio Segment [Member] | Pass [Member]          
Originated current year 166,901   166,901   400,836
Originated prior year 288,266   288,266   237,303
Originated two years prior 241,500   241,500   203,190
Originated three years prior 163,651   163,651   201,837
Originated four years prior 166,698   166,698   27,359
Originated years prior 121,416   121,416   90,724
Revolving 1,785,634   1,785,634   1,675,260
Converted to Term 7,520   7,520   7,804
Loans 2,941,586   2,941,586   2,844,313
Commercial Portfolio Segment [Member] | Special Mention [Member]          
Originated current year 3,500   3,500   0
Originated prior year 0   0   17,424
Originated two years prior 0   0   740
Originated three years prior 2,834   2,834   0
Originated four years prior 0   0   9,117
Originated years prior 4,121   4,121   5,139
Revolving 108,087   108,087   92,632
Converted to Term 0   0   0
Loans 118,542   118,542   125,052
Commercial Portfolio Segment [Member] | Substandard [Member]          
Originated current year 45   45   50
Originated prior year 10,750   10,750   5,070
Originated two years prior 21,661   21,661   12,104
Originated three years prior 10,672   10,672   6,773
Originated four years prior 3,751   3,751   22,357
Originated years prior 29,508   29,508   6,256
Revolving 55,325   55,325   67,553
Converted to Term 562   562   222
Loans 132,274   132,274   120,385
Commercial Portfolio Segment [Member] | Doubtful [Member]          
Originated current year         1,857
Originated prior year         0
Originated two years prior         0
Originated three years prior         3,118
Originated four years prior         0
Originated years prior         0
Revolving         0
Converted to Term         0
Loans         4,975
Real Estate Construction Portfolio Segment [Member]          
Originated current year 11,888   11,888   22,562
Originated prior year 52,571   52,571   60,065
Originated two years prior 65,643   65,643   126,200
Originated three years prior 96,013   96,013   93,115
Originated four years prior 59,598   59,598   16,858
Originated years prior 11,547   11,547   0
Revolving 2,637   2,637   0
Converted to Term 0   0   0
Loans 299,897   299,897   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 11,888   11,888   22,562
Originated prior year 52,571   52,571   55,835
Originated two years prior 61,413   61,413   126,200
Originated three years prior 93,629   93,629   57,546
Originated four years prior 29,452   29,452   3,021
Originated years prior 3,108   3,108   0
Revolving 2,637   2,637   0
Converted to Term 0   0   0
Loans 254,698   254,698   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 0   0   0
Originated three years prior 2,384   2,384   35,569
Originated four years prior 30,146   30,146   13,837
Originated years prior 0   0   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 32,530   32,530   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 4,230   4,230   0
Originated three years prior 0   0   0
Originated four years prior 0   0   0
Originated years prior 8,439   8,439   0
Revolving 0   0   0
Converted to Term 0   0   0
Loans 12,669   12,669   4,230
Commercial Real Estate Portfolio Segment [Member]          
Originated current year 1,042,251   1,042,251   1,472,030
Originated prior year 1,455,324   1,455,324   2,006,936
Originated two years prior 1,874,958   1,874,958   1,807,297
Originated three years prior 1,690,794   1,690,794   1,502,515
Originated four years prior 1,441,955   1,441,955   832,435
Originated years prior 2,655,412   2,655,412   2,206,768
Revolving 191,509   191,509   198,485
Converted to Term 1,873   1,873   0
Loans 10,354,076   10,354,076   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     2,909   4,173
Revolving, write offs     0   0
Converted to term, write offs     0   0
Loans, write offs 3,839 (0) 3,839 251 4,469
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]          
Originated current year 1,020,084   1,020,084   1,463,225
Originated prior year 1,440,094   1,440,094   1,987,280
Originated two years prior 1,852,003   1,852,003   1,724,563
Originated three years prior 1,571,769   1,571,769   1,428,124
Originated four years prior 1,343,369   1,343,369   800,645
Originated years prior 2,542,860   2,542,860   2,108,143
Revolving 168,059   168,059   180,394
Converted to Term 0   0   0
Loans 9,938,238   9,938,238   9,692,374
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]          
Originated current year 19,687   19,687   8,805
Originated prior year 177   177   8,292
Originated two years prior 11,610   11,610   28,465
Originated three years prior 54,989   54,989   16,462
Originated four years prior 35,551   35,551   24,844
Originated years prior 17,973   17,973   19,888
Revolving 17,746   17,746   9,939
Converted to Term 0   0   0
Loans 157,733   157,733   116,695
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]          
Originated current year 2,480   2,480   0
Originated prior year 15,053   15,053   11,364
Originated two years prior 11,345   11,345   54,269
Originated three years prior 64,036   64,036   57,929
Originated four years prior 63,035   63,035   6,946
Originated years prior 94,579   94,579   78,737
Revolving 5,704   5,704   8,152
Converted to Term 1,873   1,873   0
Loans 258,105   258,105   217,397
Residential Portfolio Segment [Member]          
Originated current year 449,836   449,836   642,965
Originated prior year 566,809   566,809   1,022,932
Originated two years prior 956,600   956,600   1,019,204
Originated three years prior 967,911   967,911   786,401
Originated four years prior 732,362   732,362   456,847
Originated years prior 2,019,218   2,019,218   1,760,944
Revolving 0   0   0
Converted to Term 0   0   0
Loans 5,692,736   5,692,736   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 449,805   449,805   642,568
Originated prior year 565,116   565,116   1,020,419
Originated two years prior 953,064   953,064   1,014,842
Originated three years prior 965,617   965,617   781,218
Originated four years prior 728,568   728,568   452,623
Originated years prior 2,001,003   2,001,003   1,745,923
Revolving 0   0   0
Converted to Term 0   0   0
Loans 5,663,173   5,663,173   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 1,604   1,604   1,585
Revolving 0   0   0
Converted to Term 0   0   0
Loans 1,604   1,604   1,618
Residential Portfolio Segment [Member] | Substandard [Member]          
Originated current year 31   31   397
Originated prior year 1,693   1,693   2,513
Originated two years prior 3,536   3,536   4,362
Originated three years prior 2,294   2,294   5,183
Originated four years prior 3,794   3,794   4,191
Originated years prior 16,611   16,611   13,436
Revolving 0   0   0
Converted to Term 0   0   0
Loans 27,959   27,959   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 213,822   213,822   214,301
Converted to Term 16,857   16,857   16,449
Loans 230,679   230,679   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 212,868   212,868   211,374
Converted to Term 16,720   16,720   16,277
Loans 229,588   229,588   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
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 954   954   2,927
Converted to Term 137   137   161
Loans 1,091   1,091   3,088
Installment and Other Loans [Member ]          
Originated current year 0   0   5,264
Originated prior year 0   0   0
Originated two years prior 0   0   44
Originated three years prior 1,078   1,078   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 1,078   1,078   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) $ (0) 0 $ (0) 15
Installment and Other Loans [Member ] | Pass [Member]          
Originated current year 0   0   5,264
Originated prior year 0   0   0
Originated two years prior 0   0   44
Originated three years prior 1,078   1,078   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 $ 1,078   $ 1,078   $ 5,308