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Note 5 - Loans - Loan Held for Investment by Loan Portfolio Segments, Internal Risk Ratings and Vintage Year (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Loans originated in current year | $ 3,724,618 | $ 3,943,040
Loans originated year prior | 3,581,730 | 3,489,846
Loans originated three years prior | 3,052,314 | 1,905,136
Loans originated four years prior | 1,588,314 | 1,908,992
Loans originated five years prior | 1,686,965 | 1,530,238
Total, Loans Amortized Cost Basis by Origination Year Prior | 3,571,544 | 3,138,606
Total, Revolving Loans | 2,306,710 | 2,303,152
Total, Revolving Converted to Term Loans | 25,225 | 28,373
Total loans | 19,537,420 | 18,247,383
Loans originated in current year, write offs | 0 | 212
Loans originated year prior, write offs | 992 | 587
Loans originated three years prior, write offs | 1,520 | 120
Loans originated four years prior, write offs | 384 | 71
Loans originated five years prior, write offs | 4,641 | 3,938
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 14,429 | 360
Total, Revolving Loans Write Offs | 1,520 | 202
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 23,486 | 5,490
Total loans | 19,537,420 | 18,247,383
Commercial Portfolio Segment [Member] |  |
Loans originated in current year | 387,945 | 489,985
Loans originated year prior | 329,467 | 464,093
Loans originated three years prior | 345,104 | 183,386
Loans originated four years prior | 122,567 | 125,786
Loans originated five years prior | 76,044 | 113,155
Total, Loans Amortized Cost Basis by Origination Year Prior | 141,937 | 117,988
Total, Revolving Loans | 1,890,712 | 1,816,937
Total, Revolving Converted to Term Loans | 8,424 | 6,693
Total loans | 3,302,200 | 3,318,023
Loans originated in current year, write offs | 0 | 96
Loans originated year prior, write offs | 977 | 587
Loans originated three years prior, write offs | 1,312 | 120
Loans originated four years prior, write offs | 384 | 71
Loans originated five years prior, write offs | 3,672 | 1,786
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 6,044 | 360
Total, Revolving Loans Write Offs | 1,520 | 202
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 13,909 | 3,222
Total loans | 3,302,200 | 3,318,023
Commercial Portfolio Segment [Member] | Pass [Member] |  |
Loans originated in current year | 381,705 | 488,748
Loans originated year prior | 323,939 | 446,647
Loans originated three years prior | 326,650 | 180,226
Loans originated four years prior | 96,725 | 119,355
Loans originated five years prior | 75,281 | 107,896
Total, Loans Amortized Cost Basis by Origination Year Prior | 136,162 | 106,649
Total, Revolving Loans | 1,775,162 | 1,753,509
Total, Revolving Converted to Term Loans | 8,308 | 6,560
Total loans | 3,123,932 | 3,209,590
Total loans | 3,123,932 | 3,209,590
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |
Loans originated in current year | 4,488 | 1,212
Loans originated year prior | 4,875 | 4,696
Loans originated three years prior | 8,559 | 2,818
Loans originated four years prior | 23,380 | 68
Loans originated five years prior | 0 | 308
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 4,354
Total, Revolving Loans | 75,419 | 41,110
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 116,721 | 54,566
Total loans | 116,721 | 54,566
Commercial Portfolio Segment [Member] | Substandard [Member] |  |
Loans originated in current year | 1,752 | 25
Loans originated year prior | 653 | 12,750
Loans originated three years prior | 9,895 | 342
Loans originated four years prior | 2,462 | 4,859
Loans originated five years prior | 763 | 2,766
Total, Loans Amortized Cost Basis by Origination Year Prior | 5,775 | 6,985
Total, Revolving Loans | 40,131 | 22,084
Total, Revolving Converted to Term Loans | 116 | 133
Total loans | 61,547 | 49,944
Total loans | 61,547 | 49,944
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |
Loans originated in current year | 0 | 0
Loans originated year prior | 0 | 0
Loans originated three years prior | 0 | 0
Loans originated four years prior | 0 | 1,504
Loans originated five years prior | 0 | 2,185
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 0 | 234
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 0 | 3,923
Total loans | 0 | 3,923
Real Estate Construction Portfolio Segment [Member] |  |
Loans originated in current year | 31,461 | 99,798
Loans originated year prior | 131,984 | 264,557
Loans originated three years prior | 165,684 | 122,761
Loans originated four years prior | 44,850 | 33,858
Loans originated five years prior | 21,034 | 35,321
Total, Loans Amortized Cost Basis by Origination Year Prior | 26,129 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 421,142 | 556,295
Loans originated in current year, write offs | 0 | 0
Loans originated year prior, write offs | 0 | 0
Loans originated three years prior, write offs | 0 | 0
Loans originated four years prior, write offs | 0 | 0
Loans originated five years prior, write offs | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 4,221 | 0
Total, Revolving Loans Write Offs | 0 | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 4,221 | 0
Total loans | 421,142 | 556,295
Real Estate Construction Portfolio Segment [Member] | Pass [Member] |  |
Loans originated in current year | 29,550 | 99,798
Loans originated year prior | 131,984 | 264,197
Loans originated three years prior | 153,977 | 113,312
Loans originated four years prior | 19,461 | 20,479
Loans originated five years prior | 13,298 | 3,067
Total, Loans Amortized Cost Basis by Origination Year Prior | 3,131 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 351,401 | 500,853
Total loans | 351,401 | 500,853
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member] |  |
Loans originated in current year | 1,911 | 0
Loans originated year prior | 0 | 360
Loans originated three years prior | 11,707 | 9,449
Loans originated four years prior | 25,389 | 11,643
Loans originated five years prior | 0 | 22,945
Total, Loans Amortized Cost Basis by Origination Year Prior | 22,998 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 62,005 | 44,397
Total loans | 62,005 | 44,397
Real Estate Construction Portfolio Segment [Member] | Substandard [Member] |  |
Loans originated in current year | 0 | 0
Loans originated year prior | 0 | 0
Loans originated three years prior | 0 | 0
Loans originated four years prior | 0 | 1,736
Loans originated five years prior | 7,736 | 9,309
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 7,736 | 11,045
Total loans | 7,736 | 11,045
Commercial Real Estate Portfolio Segment [Member] |  |
Loans originated in current year | 2,159,093 | 2,122,120
Loans originated year prior | 1,990,019 | 1,793,483
Loans originated three years prior | 1,635,585 | 1,015,938
Loans originated four years prior | 893,972 | 1,146,596
Loans originated five years prior | 1,047,548 | 961,646
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,809,430 | 1,566,608
Total, Revolving Loans | 185,985 | 182,347
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 9,721,632 | 8,788,738
Loans originated in current year, write offs | 0 | 0
Loans originated year prior, write offs | 0 | 0
Loans originated three years prior, write offs | 208 | 0
Loans originated four years prior, write offs | 0 | 0
Loans originated five years prior, write offs | 969 | 2,152
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 4,164 | 0
Total, Revolving Loans Write Offs | 0 | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 5,341 | 2,152
Total loans | 9,721,632 | 8,788,738
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |
Loans originated in current year | 2,121,489 | 2,087,650
Loans originated year prior | 1,959,239 | 1,728,607
Loans originated three years prior | 1,585,010 | 975,953
Loans originated four years prior | 887,508 | 1,094,505
Loans originated five years prior | 1,019,952 | 908,748
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,726,015 | 1,420,982
Total, Revolving Loans | 184,601 | 178,116
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 9,483,814 | 8,394,561
Total loans | 9,483,814 | 8,394,561
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |
Loans originated in current year | 37,604 | 22,150
Loans originated year prior | 18,910 | 57,015
Loans originated three years prior | 38,405 | 25,593
Loans originated four years prior | 3,499 | 32,119
Loans originated five years prior | 10,303 | 17,999
Total, Loans Amortized Cost Basis by Origination Year Prior | 17,210 | 63,782
Total, Revolving Loans | 1,384 | 1,600
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 127,315 | 220,258
Total loans | 127,315 | 220,258
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |
Loans originated in current year | 0 | 12,320
Loans originated year prior | 11,870 | 7,861
Loans originated three years prior | 12,170 | 14,392
Loans originated four years prior | 2,965 | 19,972
Loans originated five years prior | 17,293 | 34,899
Total, Loans Amortized Cost Basis by Origination Year Prior | 66,205 | 81,844
Total, Revolving Loans | 0 | 2,631
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 110,503 | 173,919
Total loans | 110,503 | 173,919
Residential Portfolio Segment [Member] |  |
Loans originated in current year | 1,141,005 | 1,228,597
Loans originated year prior | 1,129,178 | 965,561
Loans originated three years prior | 905,938 | 583,051
Loans originated four years prior | 526,925 | 602,752
Loans originated five years prior | 542,339 | 420,116
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,594,048 | 1,454,010
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 5,839,433 | 5,254,087
Loans originated in current year, write offs | 0 | 0
Loans originated year prior, write offs | 0 | 0
Loans originated three years prior, write offs | 0 | 0
Loans originated four years prior, write offs | 0 | 0
Loans originated five years prior, write offs | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 | 0
Total, Revolving Loans Write Offs | 0 | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 0 | 0
Total loans | 5,839,433 | 5,254,087
Residential Portfolio Segment [Member] | Pass [Member] |  |
Loans originated in current year | 1,140,998 | 1,228,391
Loans originated year prior | 1,128,526 | 964,799
Loans originated three years prior | 902,613 | 580,990
Loans originated four years prior | 524,315 | 600,786
Loans originated five years prior | 541,005 | 417,565
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,583,118 | 1,444,320
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 5,820,575 | 5,236,851
Total loans | 5,820,575 | 5,236,851
Residential Portfolio Segment [Member] | Special Mention [Member] |  |
Loans originated in current year | 0 | 0
Loans originated year prior | 0 | 0
Loans originated three years prior | 0 | 33
Loans originated four years prior | 33 | 0
Loans originated five years prior | 0 | 752
Total, Loans Amortized Cost Basis by Origination Year Prior | 1,619 | 905
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 1,652 | 1,690
Total loans | 1,652 | 1,690
Residential Portfolio Segment [Member] | Substandard [Member] |  |
Loans originated in current year | 7 | 206
Loans originated year prior | 652 | 762
Loans originated three years prior | 3,325 | 2,028
Loans originated four years prior | 2,577 | 1,966
Loans originated five years prior | 1,334 | 1,799
Total, Loans Amortized Cost Basis by Origination Year Prior | 9,311 | 8,785
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 17,206 | 15,546
Total loans | 17,206 | 15,546
Equity Lines Portfolio Segment [Member] |  |
Loans originated in current year | 0 | 748
Loans originated year prior | 101 | 0
Loans originated three years prior | 0 | 0
Loans originated four years prior | 0 | 0
Loans originated five years prior | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 230,013 | 303,868
Total, Revolving Converted to Term Loans | 16,801 | 21,680
Total loans | 246,915 | 326,296
Loans originated in current year, write offs | 0 | 0
Loans originated year prior, write offs | 0 | 0
Loans originated three years prior, write offs | 0 | 0
Loans originated four years prior, write offs | 0 | 0
Loans originated five years prior, write offs | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 | 0
Total, Revolving Loans Write Offs | 0 | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 0 | 0
Total loans | 246,915 | 326,296
Equity Lines Portfolio Segment [Member] | Pass [Member] |  |
Loans originated in current year | 0 | 731
Loans originated year prior | 98 | 0
Loans originated three years prior | 0 | 0
Loans originated four years prior | 0 | 0
Loans originated five years prior | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 227,502 | 302,825
Total, Revolving Converted to Term Loans | 16,628 | 21,460
Total loans | 244,228 | 325,016
Total loans | 244,228 | 325,016
Equity Lines Portfolio Segment [Member] | Special Mention [Member] |  |
Loans originated in current year | 0 | 5
Loans originated year prior | 3 | 0
Loans originated three years prior | 0 | 0
Loans originated four years prior | 0 | 0
Loans originated five years prior | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 3 | 5
Total loans | 3 | 5
Equity Lines Portfolio Segment [Member] | Substandard [Member] |  |
Loans originated in current year | 0 | 12
Loans originated year prior | 0 | 0
Loans originated three years prior | 0 | 0
Loans originated four years prior | 0 | 0
Loans originated five years prior | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 2,511 | 1,043
Total, Revolving Converted to Term Loans | 173 | 220
Total loans | 2,684 | 1,275
Total loans | 2,684 | 1,275
Installment and Other Loans [Member ] |  |
Loans originated in current year | 5,114 | 1,792
Loans originated year prior | 981 | 2,152
Loans originated three years prior | 3 | 0
Loans originated four years prior | 0 | 0
Loans originated five years prior | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 6,098 | 3,944
Loans originated in current year, write offs | 0 | 116
Loans originated year prior, write offs | 15 | 0
Loans originated three years prior, write offs | 0 | 0
Loans originated four years prior, write offs | 0 | 0
Loans originated five years prior, write offs | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 0 | 0
Total, Revolving Loans Write Offs | 0 | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 | 0
YTD gross write-offs | 15 | 116
Total loans | 6,098 | 3,944
Installment and Other Loans [Member ] | Pass [Member] |  |
Loans originated in current year | 5,114 | 1,792
Loans originated year prior | 981 | 2,152
Loans originated three years prior | 3 | 0
Loans originated four years prior | 0 | 0
Loans originated five years prior | 0 | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 | 0
Total, Revolving Loans | 0 | 0
Total, Revolving Converted to Term Loans | 0 | 0
Total loans | 6,098 | 3,944
Total loans | $ 6,098 | $ 3,944

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