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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 | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023
Loans originated in current year | $ 620,981 |  | $ 3,724,618
Loans originated year prior | 3,676,808 |  | 3,581,730
Loans originated three years prior | 3,500,408 |  | 3,052,314
Loans originated four years prior | 2,939,149 |  | 1,588,314
Loans originated five years prior | 1,530,950 |  | 1,686,965
Total, Loans Amortized Cost Basis by Origination Year Prior | 4,949,750 |  | 3,571,544
Total, Revolving Loans | 2,174,209 |  | 2,306,710
Total, Revolving Converted to Term Loans | 25,404 |  | 25,225
Total loans | 19,417,659 |  | 19,537,420
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 193 |  | 992
Loans originated three years prior, write offs | 342 |  | 1,520
Loans originated four years prior, write offs | 196 |  | 384
Loans originated five years prior, write offs | 98 |  | 4,641
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 291 |  | 14,429
Total, Revolving Loans Write Offs | 1,070 |  | 1,520
Total, Revolving Converted to Term Loans, Write Offs | 3 |  | 0
YTD gross write-offs | 2,193 | $ 7,907 | 23,486
Total loans | 19,417,659 |  | 19,537,420
Commercial Portfolio Segment [Member] |  |  |
Loans originated in current year | 112,388 |  | 387,945
Loans originated year prior | 369,374 |  | 329,467
Loans originated three years prior | 298,536 |  | 345,104
Loans originated four years prior | 311,032 |  | 122,567
Loans originated five years prior | 96,912 |  | 76,044
Total, Loans Amortized Cost Basis by Origination Year Prior | 148,330 |  | 141,937
Total, Revolving Loans | 1,782,584 |  | 1,890,712
Total, Revolving Converted to Term Loans | 8,858 |  | 8,424
Total loans | 3,128,014 |  | 3,302,200
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 193 |  | 977
Loans originated three years prior, write offs | 342 |  | 1,312
Loans originated four years prior, write offs | 196 |  | 384
Loans originated five years prior, write offs | 98 |  | 3,672
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 40 |  | 6,044
Total, Revolving Loans Write Offs | 1,070 |  | 1,520
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 1,939 | 3,911 | 13,909
Total loans | 3,128,014 |  | 3,302,200
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 112,388 |  | 381,705
Loans originated year prior | 363,390 |  | 323,939
Loans originated three years prior | 288,235 |  | 326,650
Loans originated four years prior | 285,412 |  | 96,725
Loans originated five years prior | 71,446 |  | 75,281
Total, Loans Amortized Cost Basis by Origination Year Prior | 141,867 |  | 136,162
Total, Revolving Loans | 1,670,791 |  | 1,775,162
Total, Revolving Converted to Term Loans | 8,632 |  | 8,308
Total loans | 2,942,161 |  | 3,123,932
Total loans | 2,942,161 |  | 3,123,932
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 0 |  | 4,488
Loans originated year prior | 0 |  | 4,875
Loans originated three years prior | 9,791 |  | 8,559
Loans originated four years prior | 15,092 |  | 23,380
Loans originated five years prior | 23,013 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0
Total, Revolving Loans | 63,531 |  | 75,419
Total, Revolving Converted to Term Loans | 50 |  | 0
Total loans | 111,477 |  | 116,721
Total loans | 111,477 |  | 116,721
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 1,752
Loans originated year prior | 5,984 |  | 653
Loans originated three years prior | 510 |  | 9,895
Loans originated four years prior | 10,528 |  | 2,462
Loans originated five years prior | 2,453 |  | 763
Total, Loans Amortized Cost Basis by Origination Year Prior | 6,463 |  | 5,775
Total, Revolving Loans | 48,262 |  | 40,131
Total, Revolving Converted to Term Loans | 176 |  | 116
Total loans | 74,376 |  | 61,547
Total loans | 74,376 |  | 61,547
Real Estate Construction Portfolio Segment [Member] |  |  |
Loans originated in current year | 0 |  | 31,461
Loans originated year prior | 37,572 |  | 131,984
Loans originated three years prior | 138,347 |  | 165,684
Loans originated four years prior | 124,103 |  | 44,850
Loans originated five years prior | 45,013 |  | 21,034
Total, Loans Amortized Cost Basis by Origination Year Prior | 36,611 |  | 26,129
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 381,646 |  | 421,142
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 |  | 4,221
Total, Revolving Loans Write Offs | 0 |  | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 0 | (0) | 4,221
Total loans | 381,646 |  | 421,142
Real Estate Construction Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 0 |  | 29,550
Loans originated year prior | 34,582 |  | 131,984
Loans originated three years prior | 138,347 |  | 153,977
Loans originated four years prior | 124,103 |  | 19,461
Loans originated five years prior | 19,592 |  | 13,298
Total, Loans Amortized Cost Basis by Origination Year Prior | 13,613 |  | 3,131
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 330,237 |  | 351,401
Total loans | 330,237 |  | 351,401
Real Estate Construction Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 0 |  | 1,911
Loans originated year prior | 2,990 |  | 0
Loans originated three years prior | 0 |  | 11,707
Loans originated four years prior | 0 |  | 25,389
Loans originated five years prior | 25,421 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 22,998
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 28,411 |  | 62,005
Total loans | 28,411 |  | 62,005
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 |  | 0
Loans originated five years prior | 0 |  | 7,736
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 | 22,998 |  | 7,736
Total loans | 22,998 |  | 7,736
Commercial Real Estate Portfolio Segment [Member] |  |  |
Loans originated in current year | 326,752 |  | 2,159,093
Loans originated year prior | 2,156,098 |  | 1,990,019
Loans originated three years prior | 1,956,654 |  | 1,635,585
Loans originated four years prior | 1,617,736 |  | 893,972
Loans originated five years prior | 878,998 |  | 1,047,548
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,715,995 |  | 1,809,430
Total, Revolving Loans | 162,079 |  | 185,985
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 9,814,312 |  | 9,721,632
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 |  | 208
Loans originated four years prior, write offs | 0 |  | 0
Loans originated five years prior, write offs | 0 |  | 969
Total, Loans Amortized Cost Basis by Origination Year Prior, Write Offs | 251 |  | 4,164
Total, Revolving Loans Write Offs | 0 |  | 0
Total, Revolving Converted to Term Loans, Write Offs | 0 |  | 0
YTD gross write-offs | 251 | 3,990 | 5,341
Total loans | 9,814,312 |  | 9,721,632
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 326,264 |  | 2,121,489
Loans originated year prior | 2,121,324 |  | 1,959,239
Loans originated three years prior | 1,926,019 |  | 1,585,010
Loans originated four years prior | 1,565,519 |  | 887,508
Loans originated five years prior | 874,626 |  | 1,019,952
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,605,759 |  | 1,726,015
Total, Revolving Loans | 160,035 |  | 184,601
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 9,579,546 |  | 9,483,814
Total loans | 9,579,546 |  | 9,483,814
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year | 488 |  | 37,604
Loans originated year prior | 23,587 |  | 18,910
Loans originated three years prior | 16,213 |  | 38,405
Loans originated four years prior | 40,453 |  | 3,499
Loans originated five years prior | 1,407 |  | 10,303
Total, Loans Amortized Cost Basis by Origination Year Prior | 19,526 |  | 17,210
Total, Revolving Loans | 1,380 |  | 1,384
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 103,054 |  | 127,315
Total loans | 103,054 |  | 127,315
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 11,187 |  | 11,870
Loans originated three years prior | 14,422 |  | 12,170
Loans originated four years prior | 11,764 |  | 2,965
Loans originated five years prior | 2,965 |  | 17,293
Total, Loans Amortized Cost Basis by Origination Year Prior | 90,710 |  | 66,205
Total, Revolving Loans | 664 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 131,712 |  | 110,503
Total loans | 131,712 |  | 110,503
Residential Portfolio Segment [Member] |  |  |
Loans originated in current year | 180,962 |  | 1,141,005
Loans originated year prior | 1,109,737 |  | 1,129,178
Loans originated three years prior | 1,106,613 |  | 905,938
Loans originated four years prior | 886,276 |  | 526,925
Loans originated five years prior | 510,027 |  | 542,339
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,048,814 |  | 1,594,048
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 5,842,429 |  | 5,839,433
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 | 5,842,429 |  | 5,839,433
Residential Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 180,962 |  | 1,140,998
Loans originated year prior | 1,109,711 |  | 1,128,526
Loans originated three years prior | 1,106,601 |  | 902,613
Loans originated four years prior | 884,987 |  | 524,315
Loans originated five years prior | 506,331 |  | 541,005
Total, Loans Amortized Cost Basis by Origination Year Prior | 2,034,462 |  | 1,583,118
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 5,823,054 |  | 5,820,575
Total loans | 5,823,054 |  | 5,820,575
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 |  | 0
Loans originated four years prior | 0 |  | 33
Loans originated five years prior | 340 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 6,101 |  | 1,619
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 6,441 |  | 1,652
Total loans | 6,441 |  | 1,652
Residential Portfolio Segment [Member] | Substandard [Member] |  |  |
Loans originated in current year | 0 |  | 7
Loans originated year prior | 26 |  | 652
Loans originated three years prior | 12 |  | 3,325
Loans originated four years prior | 1,289 |  | 2,577
Loans originated five years prior | 3,356 |  | 1,334
Total, Loans Amortized Cost Basis by Origination Year Prior | 8,251 |  | 9,311
Total, Revolving Loans | 0 |  | 0
Total, Revolving Converted to Term Loans | 0 |  | 0
Total loans | 12,934 |  | 17,206
Total loans | 12,934 |  | 17,206
Equity Lines Portfolio Segment [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 101
Loans originated three years prior | 92 |  | 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 | 229,546 |  | 230,013
Total, Revolving Converted to Term Loans | 16,546 |  | 16,801
Total loans | 246,184 |  | 246,915
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 | 3 |  | 0
YTD gross write-offs | 3 |  | 0
Total loans | 246,184 |  | 246,915
Equity Lines Portfolio Segment [Member] | Pass [Member] |  |  |
Loans originated in current year | 0 |  | 0
Loans originated year prior | 0 |  | 98
Loans originated three years prior | 92 |  | 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 | 227,752 |  | 227,502
Total, Revolving Converted to Term Loans | 16,374 |  | 16,628
Total loans | 244,218 |  | 244,228
Total loans | 244,218 |  | 244,228
Equity Lines Portfolio Segment [Member] | Special Mention [Member] |  |  |
Loans originated in current year |  |  | 0
Loans originated year prior |  |  | 3
Loans originated three years prior |  |  | 0
Loans originated four years prior |  |  | 0
Loans originated five years prior |  |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior |  |  | 0
Total, Revolving Loans |  |  | 0
Total, Revolving Converted to Term Loans |  |  | 0
Total loans |  |  | 3
Total loans |  |  | 3
Equity Lines 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 |  | 0
Loans originated five years prior | 0 |  | 0
Total, Loans Amortized Cost Basis by Origination Year Prior | 0 |  | 0
Total, Revolving Loans | 1,794 |  | 2,511
Total, Revolving Converted to Term Loans | 172 |  | 173
Total loans | 1,966 |  | 2,684
Total loans | 1,966 |  | 2,684
Installment and Other Loans [Member ] |  |  |
Loans originated in current year | 879 |  | 5,114
Loans originated year prior | 4,027 |  | 981
Loans originated three years prior | 166 |  | 3
Loans originated four years prior | 2 |  | 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 | 5,074 |  | 6,098
Loans originated in current year, write offs | 0 |  | 0
Loans originated year prior, write offs | 0 |  | 15
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 | $ 6 | 15
Total loans | 5,074 |  | 6,098
Installment and Other Loans [Member ] | Pass [Member] |  |  |
Loans originated in current year | 879 |  | 5,114
Loans originated year prior | 4,027 |  | 981
Loans originated three years prior | 166 |  | 3
Loans originated four years prior | 2 |  | 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 | 5,074 |  | 6,098
Total loans | $ 5,074 |  | $ 6,098

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