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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

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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 + Details
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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-5 + Details
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