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Note 7 - Loans and Related Allowance for Credit Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Term loans amortized, current year |  | $ 29,420 |  | $ 153,526
Term loans amortized, one year before |  | 160,226 |  | 254,581
Term loans amortized, two years before |  | 256,829 |  | 260,086
Term loans amortized, three years before |  | 254,303 |  | 182,142
Term loans amortized, four years before |  | 177,971 |  | 111,764
Term loans amortized, prior |  | 421,501 |  | 321,137
Term loans amortized, revolving |  | 250,099 |  | 236,378
Loans | [1],[2] | 1,550,349 |  | 1,519,614
Current-period gross charge-offs, total |  | 54 | $ 7 |
Pass [Member] |  |  |  |
Term loans amortized, current year |  | 29,420 |  | 150,041
Term loans amortized, one year before |  | 159,063 |  | 253,841
Term loans amortized, two years before |  | 255,432 |  | 248,224
Term loans amortized, three years before |  | 243,152 |  | 180,483
Term loans amortized, four years before |  | 176,308 |  | 111,425
Term loans amortized, prior |  | 383,050 |  | 282,320
Term loans amortized, revolving |  | 246,718 |  | 233,892
Loans |  | 1,493,143 |  | 1,460,226
Special Mention [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 2,263
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 565 |  | 3,340
Term loans amortized, three years before |  | 2,507 |  | 389
Term loans amortized, four years before |  | 383 |  | 0
Term loans amortized, prior |  | 2,959 |  | 2,995
Term loans amortized, revolving |  | 1,721 |  | 832
Loans |  | 8,135 |  | 9,819
Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 1,222
Term loans amortized, one year before |  | 1,163 |  | 740
Term loans amortized, two years before |  | 832 |  | 8,522
Term loans amortized, three years before |  | 8,644 |  | 1,270
Term loans amortized, four years before |  | 1,280 |  | 339
Term loans amortized, prior |  | 35,492 |  | 35,822
Term loans amortized, revolving |  | 1,659 |  | 1,654
Loans |  | 49,070 |  | 49,569
Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  |
Term loans amortized, one year before |  | 0 |  |
Term loans amortized, two years before |  | 0 |  |
Term loans amortized, three years before |  | 0 |  |
Term loans amortized, four years before |  | 0 |  |
Term loans amortized, prior |  | 0 |  |
Term loans amortized, revolving |  | 1 |  |
Loans |  | 1 |  |
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] |  |  |  |
Term loans amortized, current year |  | 4,247 |  | 13,398
Term loans amortized, one year before |  | 11,965 |  | 20,265
Term loans amortized, two years before |  | 19,720 |  | 37,924
Term loans amortized, three years before |  | 37,262 |  | 39,414
Term loans amortized, four years before |  | 43,678 |  | 25,532
Term loans amortized, prior |  | 63,910 |  | 40,520
Term loans amortized, revolving |  | 4,630 |  | 4,394
Loans | [1],[2] | 185,412 |  | 181,447
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 0
Current-period gross charge-offs, three years before |  | 0 |  | 0
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 0 |  | 45
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | (0) | (0) | 45
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 4,247 |  | 12,424
Term loans amortized, one year before |  | 11,016 |  | 20,265
Term loans amortized, two years before |  | 19,720 |  | 33,389
Term loans amortized, three years before |  | 32,740 |  | 39,025
Term loans amortized, four years before |  | 43,295 |  | 25,532
Term loans amortized, prior |  | 62,859 |  | 39,393
Term loans amortized, revolving |  | 4,630 |  | 4,394
Loans |  | 178,507 |  | 174,422
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Special Mention [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 0 |  | 0
Term loans amortized, three years before |  | 0 |  | 389
Term loans amortized, four years before |  | 383 |  | 0
Term loans amortized, prior |  | 765 |  | 772
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 1,148 |  | 1,161
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 974
Term loans amortized, one year before |  | 949 |  | 0
Term loans amortized, two years before |  | 0 |  | 4,535
Term loans amortized, three years before |  | 4,522 |  | 0
Term loans amortized, four years before |  | 0 |  | 0
Term loans amortized, prior |  | 286 |  | 355
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 5,757 |  | 5,864
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] |  |  |  |
Term loans amortized, current year |  | 9,492 |  | 7,542
Term loans amortized, one year before |  | 7,504 |  | 63,559
Term loans amortized, two years before |  | 61,388 |  | 102,849
Term loans amortized, three years before |  | 102,350 |  | 49,644
Term loans amortized, four years before |  | 47,187 |  | 20,230
Term loans amortized, prior |  | 184,654 |  | 167,562
Term loans amortized, revolving |  | 1,046 |  | 905
Loans | [1],[2] | 413,621 |  | 412,291
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 0
Current-period gross charge-offs, three years before |  | 0 |  | 0
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 0 |  | 1,341
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | (0) | (0) | 1,341
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 9,492 |  | 7,542
Term loans amortized, one year before |  | 7,504 |  | 63,559
Term loans amortized, two years before |  | 61,388 |  | 96,624
Term loans amortized, three years before |  | 96,175 |  | 49,009
Term loans amortized, four years before |  | 46,552 |  | 20,230
Term loans amortized, prior |  | 151,416 |  | 133,530
Term loans amortized, revolving |  | 1,046 |  | 905
Loans |  | 373,573 |  | 371,399
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Special Mention [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 0 |  | 2,506
Term loans amortized, three years before |  | 2,507 |  | 0
Term loans amortized, four years before |  | 0 |  | 0
Term loans amortized, prior |  | 1,984 |  | 2,002
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 4,491 |  | 4,508
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 0 |  | 3,719
Term loans amortized, three years before |  | 3,668 |  | 635
Term loans amortized, four years before |  | 635 |  | 0
Term loans amortized, prior |  | 31,254 |  | 32,030
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 35,557 |  | 36,384
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 2,930
Term loans amortized, one year before |  | 2,912 |  | 36,113
Term loans amortized, two years before |  | 36,114 |  | 21,978
Term loans amortized, three years before |  | 21,870 |  | 7,437
Term loans amortized, four years before |  | 7,382 |  | 10,057
Term loans amortized, prior |  | 20,459 |  | 11,324
Term loans amortized, revolving |  | 0 |  | 10
Loans | [1],[2] | 88,737 |  | 89,849
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 0
Current-period gross charge-offs, three years before |  | 0 |  | 0
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 0 |  | 0
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | (0) | (0) | 0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 2,930
Term loans amortized, one year before |  | 2,912 |  | 36,113
Term loans amortized, two years before |  | 36,114 |  | 21,978
Term loans amortized, three years before |  | 21,870 |  | 7,437
Term loans amortized, four years before |  | 7,382 |  | 10,057
Term loans amortized, prior |  | 20,459 |  | 11,324
Term loans amortized, revolving |  | 0 |  | 10
Loans |  | 88,737 |  | 89,849
Residential Portfolio Segment [Member] |  |  |  |
Term loans amortized, current year |  | 7,506 |  | 45,381
Term loans amortized, one year before |  | 44,694 |  | 50,989
Term loans amortized, two years before |  | 49,465 |  | 62,078
Term loans amortized, three years before |  | 61,156 |  | 70,617
Term loans amortized, four years before |  | 68,662 |  | 36,067
Term loans amortized, prior |  | 119,650 |  | 88,019
Term loans amortized, revolving |  | 141 |  | 291
Loans | [1],[2] | 351,274 |  | 353,442
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 0
Current-period gross charge-offs, three years before |  | 0 |  | 0
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 1 |  | 0
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | 1 | (0) | 0
Residential Portfolio Segment [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 7,506 |  | 45,347
Term loans amortized, one year before |  | 44,694 |  | 50,820
Term loans amortized, two years before |  | 49,301 |  | 61,963
Term loans amortized, three years before |  | 60,850 |  | 69,982
Term loans amortized, four years before |  | 68,027 |  | 36,067
Term loans amortized, prior |  | 117,913 |  | 86,492
Term loans amortized, revolving |  | 141 |  | 291
Loans |  | 348,432 |  | 350,962
Residential Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 34
Term loans amortized, one year before |  | 0 |  | 169
Term loans amortized, two years before |  | 164 |  | 115
Term loans amortized, three years before |  | 306 |  | 635
Term loans amortized, four years before |  | 635 |  | 0
Term loans amortized, prior |  | 1,737 |  | 1,527
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 2,842 |  | 2,480
Commercial And Industrial [Member] |  |  |  |
Term loans amortized, current year |  | 7,186 |  | 51,131
Term loans amortized, one year before |  | 49,075 |  | 33,870
Term loans amortized, two years before |  | 33,438 |  | 31,305
Term loans amortized, three years before |  | 28,922 |  | 13,512
Term loans amortized, four years before |  | 9,893 |  | 19,169
Term loans amortized, prior |  | 23,845 |  | 4,972
Term loans amortized, revolving |  | 83,188 |  | 75,075
Loans | [1],[2] | 235,547 |  | 229,034
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 180
Current-period gross charge-offs, two years before |  | 0 |  | 23
Current-period gross charge-offs, three years before |  | 0 |  | 12
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 5 |  | 0
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | 5 | (0) | 215
Commercial And Industrial [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 7,186 |  | 48,654
Term loans amortized, one year before |  | 48,861 |  | 33,860
Term loans amortized, two years before |  | 32,864 |  | 31,305
Term loans amortized, three years before |  | 28,922 |  | 13,512
Term loans amortized, four years before |  | 9,883 |  | 18,864
Term loans amortized, prior |  | 23,475 |  | 4,888
Term loans amortized, revolving |  | 81,394 |  | 74,169
Loans |  | 232,585 |  | 225,252
Commercial And Industrial [Member] | Special Mention [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 2,263
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 565 |  | 0
Term loans amortized, three years before |  | 0 |  | 0
Term loans amortized, four years before |  | 0 |  | 0
Term loans amortized, prior |  | 0 |  | 0
Term loans amortized, revolving |  | 1,721 |  | 832
Loans |  | 2,286 |  | 3,095
Commercial And Industrial [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 214
Term loans amortized, one year before |  | 214 |  | 10
Term loans amortized, two years before |  | 9 |  | 0
Term loans amortized, three years before |  | 0 |  | 0
Term loans amortized, four years before |  | 10 |  | 305
Term loans amortized, prior |  | 370 |  | 84
Term loans amortized, revolving |  | 72 |  | 74
Loans |  | 675 |  | 687
Commercial And Industrial [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  |
Term loans amortized, one year before |  | 0 |  |
Term loans amortized, two years before |  | 0 |  |
Term loans amortized, three years before |  | 0 |  |
Term loans amortized, four years before |  | 0 |  |
Term loans amortized, prior |  | 0 |  |
Term loans amortized, revolving |  | 1 |  |
Loans |  | 1 |  |
Home Equity Lines of Credit [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 244
Term loans amortized, one year before |  | 358 |  | 68
Term loans amortized, two years before |  | 188 |  | 316
Term loans amortized, three years before |  | 343 |  | 183
Term loans amortized, four years before |  | 0 |  | 167
Term loans amortized, prior |  | 2,805 |  | 2,534
Term loans amortized, revolving |  | 143,460 |  | 139,867
Loans | [1],[2] | 147,154 |  | 143,379
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 0
Current-period gross charge-offs, three years before |  | 0 |  | 0
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 4 |  | 7
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | 4 | 7 | 7
Home Equity Lines of Credit [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 244
Term loans amortized, one year before |  | 358 |  | 0
Term loans amortized, two years before |  | 22 |  | 166
Term loans amortized, three years before |  | 195 |  | 183
Term loans amortized, four years before |  | 0 |  | 133
Term loans amortized, prior |  | 2,166 |  | 2,041
Term loans amortized, revolving |  | 142,963 |  | 139,214
Loans |  | 145,704 |  | 141,981
Home Equity Lines of Credit [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 68
Term loans amortized, two years before |  | 166 |  | 150
Term loans amortized, three years before |  | 148 |  | 0
Term loans amortized, four years before |  | 0 |  | 34
Term loans amortized, prior |  | 639 |  | 493
Term loans amortized, revolving |  | 497 |  | 653
Loans |  | 1,450 |  | 1,398
Construction and Other [Member] |  |  |  |
Term loans amortized, current year |  | 705 |  | 31,361
Term loans amortized, one year before |  | 42,390 |  | 48,670
Term loans amortized, two years before |  | 55,620 |  | 3,252
Term loans amortized, three years before |  | 2,110 |  | 1,223
Term loans amortized, four years before |  | 1,080 |  | 506
Term loans amortized, prior |  | 3,114 |  | 2,760
Term loans amortized, revolving |  | 17,634 |  | 15,836
Loans | [1],[2] | 122,653 |  | 103,608
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 0
Current-period gross charge-offs, three years before |  | 0 |  | 0
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 0 |  | 0
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | (0) | (0) | 0
Construction and Other [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 705 |  | 31,361
Term loans amortized, one year before |  | 42,390 |  | 48,177
Term loans amortized, two years before |  | 55,127 |  | 2,418
Term loans amortized, three years before |  | 2,110 |  | 1,223
Term loans amortized, four years before |  | 1,080 |  | 506
Term loans amortized, prior |  | 1,858 |  | 1,368
Term loans amortized, revolving |  | 16,544 |  | 14,909
Loans |  | 119,814 |  | 99,962
Construction and Other [Member] | Special Mention [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 0 |  | 834
Term loans amortized, three years before |  | 0 |  | 0
Term loans amortized, four years before |  | 0 |  | 0
Term loans amortized, prior |  | 210 |  | 221
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 210 |  | 1,055
Construction and Other [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 493
Term loans amortized, two years before |  | 493 |  | 0
Term loans amortized, three years before |  | 0 |  | 0
Term loans amortized, four years before |  | 0 |  | 0
Term loans amortized, prior |  | 1,046 |  | 1,171
Term loans amortized, revolving |  | 1,090 |  | 927
Loans |  | 2,629 |  | 2,591
Consumer Portfolio Segment [Member] |  |  |  |
Term loans amortized, current year |  | 284 |  | 1,539
Term loans amortized, one year before |  | 1,328 |  | 1,047
Term loans amortized, two years before |  | 896 |  | 384
Term loans amortized, three years before |  | 290 |  | 112
Term loans amortized, four years before |  | 89 |  | 36
Term loans amortized, prior |  | 3,064 |  | 3,446
Term loans amortized, revolving |  | 0 |  | 0
Loans | [1],[2] | 5,951 |  | 6,564
Current-period gross charge-offs current |  | 0 |  | 0
Current-period gross charge-offs one year before |  | 0 |  | 0
Current-period gross charge-offs, two years before |  | 0 |  | 2
Current-period gross charge-offs, three years before |  | 0 |  | 6
Current-period gross charge-offs, four years before |  | 0 |  | 0
Current-period gross charge-offs, prior |  | 44 |  | 30
Current-period gross charge-offs, revolving |  | 0 |  | 0
Current-period gross charge-offs, total |  | 44 | $ (0) | 38
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |  |
Term loans amortized, current year |  | 284 |  | 1,539
Term loans amortized, one year before |  | 1,328 |  | 1,047
Term loans amortized, two years before |  | 896 |  | 381
Term loans amortized, three years before |  | 290 |  | 112
Term loans amortized, four years before |  | 89 |  | 36
Term loans amortized, prior |  | 2,904 |  | 3,284
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | 5,791 |  | 6,399
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |  |
Term loans amortized, current year |  | 0 |  | 0
Term loans amortized, one year before |  | 0 |  | 0
Term loans amortized, two years before |  | 0 |  | 3
Term loans amortized, three years before |  | 0 |  | 0
Term loans amortized, four years before |  | 0 |  | 0
Term loans amortized, prior |  | 160 |  | 162
Term loans amortized, revolving |  | 0 |  | 0
Loans |  | $ 160 |  | $ 165
[1] | Accrued interest of $5.5 million and $5.5 million at March 31, 2025 and December 31, 2024, respectively, is excluded from amortized cost and presented in "accrued interest receivable and other assets" on the Consolidated Balance Sheets.
[2] | Unearned income, including net deferred loan fees and costs and unamortized premiums and discounts, totaled $7.7 million and $8.2 million at March 31, 2025 and December 31, 2024, respectively.

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- 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
Name: | us-gaap_FinancingReceivableAllowanceForCreditLossesWriteOffs
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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