Note 7 - Loans and Related Allowance for Credit Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Term loans amortized, current year	$ 241,600
Term loans amortized, one year before	290,633
Term loans amortized, two years before	207,871
Term loans amortized, three years before	126,649
Term loans amortized, four years before	85,500
Term loans amortized, prior	310,143
Term loans amortized, revolving	215,734
Outstanding balance	1,478,130	$ 1,352,872
Current-period gross charge-offs, total	302	446
Loss	(310,143)
Loss	(1,478,130)	(1,352,872)
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Term loans amortized, current year	14,634
Term loans amortized, one year before	39,477
Term loans amortized, two years before	41,609
Term loans amortized, three years before	26,599
Term loans amortized, four years before	12,463
Term loans amortized, prior	46,101
Term loans amortized, revolving	2,662
Outstanding balance	183,545	191,748
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	46
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	46	(0)
Loss	(46,101)
Loss	(183,545)	(191,748)
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Term loans amortized, current year	43,393
Term loans amortized, one year before	97,606
Term loans amortized, two years before	41,606
Term loans amortized, three years before	22,707
Term loans amortized, four years before	41,529
Term loans amortized, prior	154,235
Term loans amortized, revolving	504
Outstanding balance	401,580	380,580
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	0
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	(0)	150
Loss	(154,235)
Loss	(401,580)	(380,580)
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Term loans amortized, current year	29,218
Term loans amortized, one year before	25,776
Term loans amortized, two years before	4,267
Term loans amortized, three years before	10,453
Term loans amortized, four years before	1,391
Term loans amortized, prior	11,297
Term loans amortized, revolving	104
Outstanding balance	82,506	58,251
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	0
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	(0)	(0)
Loss	(11,297)
Loss	(82,506)	(58,251)
Residential Portfolio Segment [Member]
Term loans amortized, current year	50,086
Term loans amortized, one year before	56,307
Term loans amortized, two years before	79,119
Term loans amortized, three years before	39,476
Term loans amortized, four years before	19,442
Term loans amortized, prior	83,752
Term loans amortized, revolving	672
Outstanding balance	328,854	296,308
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	108
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	108	(0)
Loss	(83,752)
Loss	(328,854)	(296,308)
Commercial And Industrial [Member]
Term loans amortized, current year	46,931
Term loans amortized, one year before	43,509
Term loans amortized, two years before	17,909
Term loans amortized, three years before	25,496
Term loans amortized, four years before	2,865
Term loans amortized, prior	7,405
Term loans amortized, revolving	77,393
Outstanding balance	221,508	195,602
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	75
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	6
Current-period gross charge-offs, prior	4
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	85	40
Loss	(7,405)
Loss	(221,508)	(195,602)
Home Equity Lines of Credit [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	231
Term loans amortized, two years before	0
Term loans amortized, three years before	52
Term loans amortized, four years before	92
Term loans amortized, prior	2,680
Term loans amortized, revolving	124,763
Outstanding balance	127,818	128,065
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	0
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	(0)	25
Loss	(2,680)
Loss	(127,818)	(128,065)
Construction and Other [Member]
Term loans amortized, current year	55,528
Term loans amortized, one year before	26,632
Term loans amortized, two years before	23,037
Term loans amortized, three years before	1,777
Term loans amortized, four years before	7,644
Term loans amortized, prior	851
Term loans amortized, revolving	9,636
Outstanding balance	125,105	94,199
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	0
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	0
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	(0)	(0)
Loss	(851)
Loss	(125,105)	(94,199)
Consumer Portfolio Segment [Member]
Term loans amortized, current year	1,810
Term loans amortized, one year before	1,095
Term loans amortized, two years before	324
Term loans amortized, three years before	89
Term loans amortized, four years before	74
Term loans amortized, prior	3,822
Term loans amortized, revolving	0
Outstanding balance	7,214	8,119
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	25
Current-period gross charge-offs, two years before	0
Current-period gross charge-offs, three years before	0
Current-period gross charge-offs, four years before	0
Current-period gross charge-offs, prior	38
Current-period gross charge-offs, revolving	0
Current-period gross charge-offs, total	63	231
Loss	(3,822)
Loss	(7,214)	(8,119)
Pass [Member]
Outstanding balance		1,272,088
Loss		(1,272,088)
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Term loans amortized, current year	14,634
Term loans amortized, one year before	34,850
Term loans amortized, two years before	41,609
Term loans amortized, three years before	25,040
Term loans amortized, four years before	12,304
Term loans amortized, prior	41,976
Term loans amortized, revolving	2,662
Outstanding balance	173,075	176,400
Loss	(41,976)
Loss	(173,075)	(176,400)
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Term loans amortized, current year	43,393
Term loans amortized, one year before	95,098
Term loans amortized, two years before	40,959
Term loans amortized, three years before	22,707
Term loans amortized, four years before	32,405
Term loans amortized, prior	127,469
Term loans amortized, revolving	504
Outstanding balance	362,535	331,584
Loss	(127,469)
Loss	(362,535)	(331,584)
Pass [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Term loans amortized, current year	29,218
Term loans amortized, one year before	25,776
Term loans amortized, two years before	4,267
Term loans amortized, three years before	10,453
Term loans amortized, four years before	1,391
Term loans amortized, prior	11,231
Term loans amortized, revolving	104
Outstanding balance	82,440	58,251
Loss	(11,231)
Loss	(82,440)	(58,251)
Pass [Member] | Residential Portfolio Segment [Member]
Term loans amortized, current year	50,086
Term loans amortized, one year before	56,180
Term loans amortized, two years before	78,909
Term loans amortized, three years before	39,476
Term loans amortized, four years before	19,418
Term loans amortized, prior	82,441
Term loans amortized, revolving	672
Outstanding balance	327,182	294,254
Loss	(82,441)
Loss	(327,182)	(294,254)
Pass [Member] | Commercial And Industrial [Member]
Term loans amortized, current year	46,918
Term loans amortized, one year before	43,494
Term loans amortized, two years before	17,909
Term loans amortized, three years before	25,143
Term loans amortized, four years before	2,741
Term loans amortized, prior	6,533
Term loans amortized, revolving	66,842
Outstanding balance	209,580	185,674
Loss	(6,533)
Loss	(209,580)	(185,674)
Pass [Member] | Home Equity Lines of Credit [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	126
Term loans amortized, two years before	0
Term loans amortized, three years before	16
Term loans amortized, four years before	63
Term loans amortized, prior	2,097
Term loans amortized, revolving	124,001
Outstanding balance	126,303	127,080
Loss	(2,097)
Loss	(126,303)	(127,080)
Pass [Member] | Construction and Other [Member]
Term loans amortized, current year	55,528
Term loans amortized, one year before	23,059
Term loans amortized, two years before	20,246
Term loans amortized, three years before	1,777
Term loans amortized, four years before	5,609
Term loans amortized, prior	851
Term loans amortized, revolving	9,152
Outstanding balance	116,222	90,728
Loss	(851)
Loss	(116,222)	(90,728)
Pass [Member] | Consumer Portfolio Segment [Member]
Term loans amortized, current year	1,810
Term loans amortized, one year before	1,088
Term loans amortized, two years before	324
Term loans amortized, three years before	89
Term loans amortized, four years before	74
Term loans amortized, prior	3,669
Term loans amortized, revolving	0
Outstanding balance	7,054	8,117
Loss	(3,669)
Loss	(7,054)	(8,117)
Special Mention [Member]
Outstanding balance		21,504
Loss		(21,504)
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	2,271
Term loans amortized, two years before	0
Term loans amortized, three years before	0
Term loans amortized, four years before	13
Term loans amortized, prior	799
Term loans amortized, revolving	0
Outstanding balance	3,083	6,873
Loss	(799)
Loss	(3,083)	(6,873)
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	2,508
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	2,197
Term loans amortized, revolving	0
Outstanding balance	4,705	6,387
Loss	(2,197)
Loss	(4,705)	(6,387)
Special Mention [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Outstanding balance		0
Loss		0
Special Mention [Member] | Residential Portfolio Segment [Member]
Outstanding balance		0
Loss		0
Special Mention [Member] | Commercial And Industrial [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	184
Outstanding balance	184	7,936
Loss	0
Loss	(184)	(7,936)
Special Mention [Member] | Home Equity Lines of Credit [Member]
Outstanding balance		0
Loss		0
Special Mention [Member] | Construction and Other [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	3,573
Term loans amortized, two years before	2,371
Term loans amortized, three years before	0
Term loans amortized, four years before	265
Term loans amortized, prior	0
Term loans amortized, revolving	0
Outstanding balance	6,209	308
Loss	0
Loss	(6,209)	(308)
Special Mention [Member] | Consumer Portfolio Segment [Member]
Outstanding balance		0
Loss		0
Substandard [Member]
Outstanding balance		59,280
Loss		(59,280)
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	2,356
Term loans amortized, two years before	0
Term loans amortized, three years before	1,559
Term loans amortized, four years before	146
Term loans amortized, prior	3,326
Term loans amortized, revolving	0
Outstanding balance	7,387	8,475
Loss	(3,326)
Loss	(7,387)	(8,475)
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [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	5,237
Term loans amortized, prior	24,569
Term loans amortized, revolving	0
Outstanding balance	29,806	42,609
Loss	(24,569)
Loss	(29,806)	(42,609)
Substandard [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [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	66
Term loans amortized, revolving	0
Outstanding balance	66	0
Loss	(66)
Loss	(66)	0
Substandard [Member] | Residential Portfolio Segment [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	127
Term loans amortized, two years before	210
Term loans amortized, three years before	0
Term loans amortized, four years before	24
Term loans amortized, prior	1,311
Term loans amortized, revolving	0
Outstanding balance	1,672	2,054
Loss	(1,311)
Loss	(1,672)	(2,054)
Substandard [Member] | Commercial And Industrial [Member]
Term loans amortized, current year	13
Term loans amortized, one year before	15
Term loans amortized, two years before	0
Term loans amortized, three years before	353
Term loans amortized, four years before	124
Term loans amortized, prior	876
Term loans amortized, revolving	10,367
Outstanding balance	11,748	1,992
Loss	(876)
Loss	(11,748)	(1,992)
Substandard [Member] | Home Equity Lines of Credit [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	105
Term loans amortized, two years before	0
Term loans amortized, three years before	36
Term loans amortized, four years before	29
Term loans amortized, prior	583
Term loans amortized, revolving	762
Outstanding balance	1,515	985
Loss	(583)
Loss	(1,515)	(985)
Substandard [Member] | Construction and Other [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	0
Term loans amortized, two years before	420
Term loans amortized, three years before	0
Term loans amortized, four years before	1,770
Term loans amortized, prior	0
Term loans amortized, revolving	484
Outstanding balance	2,674	3,163
Loss	0
Loss	(2,674)	(3,163)
Substandard [Member] | Consumer Portfolio Segment [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	7
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	153
Term loans amortized, revolving	0
Outstanding balance	160	2
Loss	(153)
Loss	(160)	(2)
Doubtful [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	0
Term loans amortized, two years before	647
Term loans amortized, three years before	0
Term loans amortized, four years before	3,887
Term loans amortized, prior	0
Term loans amortized, revolving	0
Outstanding balance	4,534	0
Loss	0
Loss	(4,534)	0
Doubtful [Member] | Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Residential Portfolio Segment [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Commercial And Industrial [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Home Equity Lines of Credit [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Construction and Other [Member]
Outstanding balance		0
Loss		0
Doubtful [Member] | Consumer Portfolio Segment [Member]
Outstanding balance		0
Loss		$ 0
Unlikely to be Collected Financing Receivable [Member] | Commercial And Industrial [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	4
Term loans amortized, revolving	0
Outstanding balance	4
Loss	(4)
Loss	$ (4)