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Note 6 - Loans and the Allowance for Credit Losses - Loans by Origination and Risk Designation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Originated Current Fiscal Year | $ 152,948 |  | $ 511,688
Originated One Year Prior | 500,657 |  | 443,185
Originated Two Years Prior | 436,761 |  | 1,724,765
Originated Three Years Prior | 1,694,906 |  | 1,782,673
Originated Four Years Prior | 1,737,754 |  | 397,679
Originated Five or More Years Prior | 2,030,187 |  | 1,685,185
Revolving Loans | 1,653,130 |  | 1,735,307
Gross loans | 8,206,343 |  | 8,280,482
Gross write-off, current year | 0 |  | 0
Gross write-off, one year prior | 0 |  | 0
Gross write-off, two years prior | 0 |  | 1,003
Gross write-off, three years prior | 0 |  | 49
Gross write-off, four years prior | 0 |  | 0
Gross write-off, five years prior | 3,555 |  | 10,732
Gross write-off, revolving | 0 |  | 1,918
Gross write-off | 3,555 | $ 3,185 | 13,702
Pass [Member] |  |  |
Originated Current Fiscal Year | 152,948 |  | 509,780
Originated One Year Prior | 498,755 |  | 440,166
Originated Two Years Prior | 433,787 |  | 1,660,146
Originated Three Years Prior | 1,634,861 |  | 1,778,072
Originated Four Years Prior | 1,729,607 |  | 393,127
Originated Five or More Years Prior | 1,895,243 |  | 1,566,356
Revolving Loans | 1,629,404 |  | 1,711,061
Gross loans | 7,974,605 |  | 8,058,708
Special Mention [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 1,908
Originated One Year Prior | 1,902 |  | 0
Originated Two Years Prior | 0 |  | 56,459
Originated Three Years Prior | 51,717 |  | 2,538
Originated Four Years Prior | 1,309 |  | 1,643
Originated Five or More Years Prior | 82,047 |  | 66,563
Revolving Loans | 2,762 |  | 20,264
Gross loans | 139,737 |  | 149,375
Substandard [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 3,019
Originated Two Years Prior | 2,974 |  | 8,160
Originated Three Years Prior | 8,328 |  | 2,063
Originated Four Years Prior | 6,838 |  | 2,909
Originated Five or More Years Prior | 52,897 |  | 52,266
Revolving Loans | 20,964 |  | 3,982
Gross loans | 92,001 |  | 72,399
Doubtful [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Commercial Portfolio Segment [Member] |  |  |
Originated Current Fiscal Year | 28,946 |  | 69,206
Originated One Year Prior | 64,048 |  | 160,086
Originated Two Years Prior | 154,191 |  | 201,124
Originated Three Years Prior | 196,873 |  | 239,820
Originated Four Years Prior | 232,796 |  | 31,360
Originated Five or More Years Prior | 155,018 |  | 133,894
Revolving Loans | 661,048 |  | 697,240
Gross loans | 1,492,920 |  | 1,532,730
Gross write-off, current year | 0 |  | 0
Gross write-off, one year prior | 0 |  | 0
Gross write-off, two years prior | 0 |  | 1,003
Gross write-off, three years prior | 0 |  | 49
Gross write-off, four years prior | 0 |  | 0
Gross write-off, five years prior | 0 |  | 316
Gross write-off, revolving | 0 |  | 1,918
Gross write-off | 0 | 300 | 3,286
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Originated Current Fiscal Year | 28,946 |  | 67,298
Originated One Year Prior | 62,146 |  | 157,067
Originated Two Years Prior | 151,217 |  | 194,602
Originated Three Years Prior | 190,275 |  | 237,065
Originated Four Years Prior | 230,187 |  | 29,717
Originated Five or More Years Prior | 129,297 |  | 111,841
Revolving Loans | 642,514 |  | 678,206
Gross loans | 1,434,582 |  | 1,475,796
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 1,908
Originated One Year Prior | 1,902 |  | 0
Originated Two Years Prior | 0 |  | 2,817
Originated Three Years Prior | 351 |  | 2,538
Originated Four Years Prior | 0 |  | 1,643
Originated Five or More Years Prior | 6,681 |  | 6,209
Revolving Loans | 0 |  | 17,491
Gross loans | 8,934 |  | 32,606
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 3,019
Originated Two Years Prior | 2,974 |  | 3,705
Originated Three Years Prior | 6,247 |  | 217
Originated Four Years Prior | 2,609 |  | 0
Originated Five or More Years Prior | 19,040 |  | 15,844
Revolving Loans | 18,534 |  | 1,543
Gross loans | 49,404 |  | 24,328
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Commercial Real Estate Portfolio Segment [Member] |  |  |
Originated Current Fiscal Year | 113,550 |  | 408,314
Originated One Year Prior | 390,234 |  | 268,533
Originated Two Years Prior | 268,061 |  | 1,481,673
Originated Three Years Prior | 1,456,301 |  | 1,511,933
Originated Four Years Prior | 1,474,246 |  | 341,305
Originated Five or More Years Prior | 1,756,487 |  | 1,453,635
Revolving Loans | 378,792 |  | 415,286
Gross loans | 5,837,671 |  | 5,880,679
Gross write-off, current year | 0 |  | 0
Gross write-off, one year prior | 0 |  | 0
Gross write-off, two years prior | 0 |  | 0
Gross write-off, three years prior | 0 |  | 0
Gross write-off, four years prior | 0 |  | 0
Gross write-off, five years prior | 3,555 |  | 10,416
Gross write-off, revolving | 0 |  | 0
Gross write-off | 3,555 | 2,885 | 10,416
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Originated Current Fiscal Year | 113,550 |  | 408,314
Originated One Year Prior | 390,234 |  | 268,533
Originated Two Years Prior | 268,061 |  | 1,424,209
Originated Three Years Prior | 1,403,487 |  | 1,510,087
Originated Four Years Prior | 1,468,708 |  | 339,553
Originated Five or More Years Prior | 1,649,401 |  | 1,357,858
Revolving Loans | 378,792 |  | 415,286
Gross loans | 5,672,233 |  | 5,723,840
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 53,642
Originated Three Years Prior | 51,366 |  | 0
Originated Four Years Prior | 1,309 |  | 0
Originated Five or More Years Prior | 74,735 |  | 59,719
Revolving Loans | 0 |  | 0
Gross loans | 127,410 |  | 113,361
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 3,822
Originated Three Years Prior | 1,448 |  | 1,846
Originated Four Years Prior | 4,229 |  | 1,752
Originated Five or More Years Prior | 32,351 |  | 36,058
Revolving Loans | 0 |  | 0
Gross loans | 38,028 |  | 43,478
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Commercial Construction Portfolio Segment [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 15,390
Originated One Year Prior | 25,440 |  | 0
Originated Two Years Prior | 0 |  | 2,137
Originated Three Years Prior | 2,137 |  | 8,995
Originated Four Years Prior | 8,954 |  | 6,518
Originated Five or More Years Prior | 6,236 |  | 0
Revolving Loans | 574,826 |  | 583,206
Gross loans | 617,593 |  | 616,246
Gross write-off, current year | 0 |  | 0
Gross write-off, one year prior | 0 |  | 0
Gross write-off, two years prior | 0 |  | 0
Gross write-off, three years prior | 0 |  | 0
Gross write-off, four years prior | 0 |  | 0
Gross write-off, five years prior | 0 |  | 0
Gross write-off, revolving | 0 |  | 0
Gross write-off | 0 | (0) | 0
Commercial Construction Portfolio Segment [Member] | Pass [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 15,390
Originated One Year Prior | 25,440 |  | 0
Originated Two Years Prior | 0 |  | 2,137
Originated Three Years Prior | 2,137 |  | 8,995
Originated Four Years Prior | 8,954 |  | 6,518
Originated Five or More Years Prior | 6,236 |  | 0
Revolving Loans | 572,622 |  | 581,002
Gross loans | 615,389 |  | 614,042
Commercial Construction Portfolio Segment [Member] | Special Mention [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Commercial Construction Portfolio Segment [Member] | Substandard [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 2,204 |  | 2,204
Gross loans | 2,204 |  | 2,204
Commercial Construction Portfolio Segment [Member] | Doubtful [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Residential Portfolio Segment [Member] |  |  |
Originated Current Fiscal Year | 8,979 |  | 17,763
Originated One Year Prior | 20,915 |  | 14,542
Originated Two Years Prior | 14,486 |  | 39,830
Originated Three Years Prior | 39,594 |  | 21,925
Originated Four Years Prior | 21,758 |  | 18,496
Originated Five or More Years Prior | 112,446 |  | 97,656
Revolving Loans | 38,377 |  | 39,479
Gross loans | 256,555 |  | 249,691
Gross write-off, current year | 0 |  | 0
Gross write-off, one year prior | 0 |  | 0
Gross write-off, two years prior | 0 |  | 0
Gross write-off, three years prior | 0 |  | 0
Gross write-off, four years prior | 0 |  | 0
Gross write-off, five years prior | 0 |  | 0
Gross write-off, revolving | 0 |  | 0
Gross write-off | 0 | (0) | 0
Residential Portfolio Segment [Member] | Pass [Member] |  |  |
Originated Current Fiscal Year | 8,979 |  | 17,763
Originated One Year Prior | 20,915 |  | 14,542
Originated Two Years Prior | 14,486 |  | 39,197
Originated Three Years Prior | 38,961 |  | 21,925
Originated Four Years Prior | 21,758 |  | 17,339
Originated Five or More Years Prior | 110,309 |  | 96,657
Revolving Loans | 35,389 |  | 36,471
Gross loans | 250,797 |  | 243,894
Residential Portfolio Segment [Member] | Special Mention [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 631 |  | 635
Revolving Loans | 2,762 |  | 2,773
Gross loans | 3,393 |  | 3,408
Residential Portfolio Segment [Member] | Substandard [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 633
Originated Three Years Prior | 633 |  | 0
Originated Four Years Prior | 0 |  | 1,157
Originated Five or More Years Prior | 1,506 |  | 364
Revolving Loans | 226 |  | 235
Gross loans | 2,365 |  | 2,389
Residential Portfolio Segment [Member] | Doubtful [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Consumer Portfolio Segment [Member] |  |  |
Originated Current Fiscal Year | 1,473 |  | 1,015
Originated One Year Prior | 20 |  | 24
Originated Two Years Prior | 23 |  | 1
Originated Three Years Prior | 1 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 87 |  | 96
Gross loans | 1,604 |  | 1,136
Gross write-off, current year | 0 |  | 0
Gross write-off, one year prior | 0 |  | 0
Gross write-off, two years prior | 0 |  | 0
Gross write-off, three years prior | 0 |  | 0
Gross write-off, four years prior | 0 |  | 0
Gross write-off, five years prior | 0 |  | 0
Gross write-off, revolving | 0 |  | 0
Gross write-off | 0 | $ (0) | 0
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |
Originated Current Fiscal Year | 1,473 |  | 1,015
Originated One Year Prior | 20 |  | 24
Originated Two Years Prior | 23 |  | 1
Originated Three Years Prior | 1 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 87 |  | 96
Gross loans | 1,604 |  | 1,136
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | 0 |  | 0
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |  |
Originated Current Fiscal Year | 0 |  | 0
Originated One Year Prior | 0 |  | 0
Originated Two Years Prior | 0 |  | 0
Originated Three Years Prior | 0 |  | 0
Originated Four Years Prior | 0 |  | 0
Originated Five or More Years Prior | 0 |  | 0
Revolving Loans | 0 |  | 0
Gross loans | $ 0 |  | $ 0

X
- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + 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://fasb.org/us-gaap/role/ref/otherTransitionRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 11B -Subparagraph (c)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481962/310-10-50-11B Reference 3: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 Reference 4: 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, before allowance for credit loss, fee, and loan in process, of financing receivable. Excludes financing receivable covered under loss sharing agreement and net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481990/310-10-45-2 Reference 2: 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 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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- Definition Amortized cost of financing receivable originated three years prior to current fiscal year. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 79 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479294/326-20-55-79 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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