Note 8 - Loans and Related Allowance for Credit Losses - Classes of the Loan Portfolio Summarized by Credit Quality (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022
Term loans amortized, current year	$ 63,204
Term loans amortized, one year before	286,299
Term loans amortized, two years before	228,544
Term loans amortized, three years before	140,153
Term loans amortized, four years before	89,638
Term loans amortized, prior	368,854
Term loans amortized, revolving	206,155
Outstanding balance	1,382,847		$ 1,352,872
Charge-offs	(112)	$ (61)
Pass [Member]
Outstanding balance			1,272,088
Special Mention [Member]
Outstanding balance			21,504
Substandard [Member]
Outstanding balance			59,280
Doubtful [Member]
Outstanding balance			0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member]
Term loans amortized, current year	3,245
Term loans amortized, one year before	35,446
Term loans amortized, two years before	42,999
Term loans amortized, three years before	27,801
Term loans amortized, four years before	15,502
Term loans amortized, prior	56,805
Term loans amortized, revolving	3,863
Outstanding balance	185,661		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	0
Current-period gross charge-offs, revolving	0
Charge-offs	0	0
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Pass [Member]
Term loans amortized, current year	3,245
Term loans amortized, one year before	31,354
Term loans amortized, two years before	42,999
Term loans amortized, three years before	26,212
Term loans amortized, four years before	14,801
Term loans amortized, prior	48,029
Term loans amortized, revolving	3,863
Outstanding balance	170,503		176,400
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Special Mention [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	4,092
Term loans amortized, two years before	0
Term loans amortized, three years before	1,589
Term loans amortized, four years before	701
Term loans amortized, prior	431
Term loans amortized, revolving	0
Outstanding balance	6,813		6,873
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Substandard [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	8,345
Term loans amortized, revolving	0
Outstanding balance	8,345		8,475
Commercial Real Estate Portfolio Segment [Member] | Owner Occupied Loan [Member] | Doubtful [Member]
Outstanding balance			0
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member]
Term loans amortized, current year	17,592
Term loans amortized, one year before	73,913
Term loans amortized, two years before	50,323
Term loans amortized, three years before	24,380
Term loans amortized, four years before	41,888
Term loans amortized, prior	184,041
Term loans amortized, revolving	2,194
Outstanding balance	394,331		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
Charge-offs	0	0
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Pass [Member]
Term loans amortized, current year	17,592
Term loans amortized, one year before	71,406
Term loans amortized, two years before	49,627
Term loans amortized, three years before	24,380
Term loans amortized, four years before	37,711
Term loans amortized, prior	138,870
Term loans amortized, revolving	2,194
Outstanding balance	341,780		331,584
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Special Mention [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	2,507
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	3,836
Term loans amortized, revolving	0
Outstanding balance	6,343		6,387
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Substandard [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	41,335
Term loans amortized, revolving	0
Outstanding balance	41,335		42,609
Commercial Real Estate Portfolio Segment [Member] | Non-owner occupied Loan [Member] | Doubtful [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	0
Term loans amortized, two years before	696
Term loans amortized, three years before	0
Term loans amortized, four years before	4,177
Term loans amortized, prior	0
Term loans amortized, revolving	0
Outstanding balance	4,873		0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member]
Term loans amortized, current year	4,380
Term loans amortized, one year before	28,027
Term loans amortized, two years before	4,382
Term loans amortized, three years before	10,736
Term loans amortized, four years before	1,423
Term loans amortized, prior	14,803
Term loans amortized, revolving	141
Outstanding balance	63,892		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
Charge-offs	0	0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Pass [Member]
Term loans amortized, current year	4,380
Term loans amortized, one year before	28,027
Term loans amortized, two years before	4,382
Term loans amortized, three years before	10,736
Term loans amortized, four years before	1,423
Term loans amortized, prior	14,803
Term loans amortized, revolving	141
Outstanding balance	63,892		58,251
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Special Mention [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	0
Outstanding balance	0		0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Substandard [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	0
Outstanding balance	0		0
Commercial Real Estate Portfolio Segment [Member] | Multifamily Loan [Member] | Doubtful [Member]
Outstanding balance			0
Residential Portfolio Segment [Member]
Term loans amortized, current year	12,659
Term loans amortized, one year before	54,476
Term loans amortized, two years before	82,314
Term loans amortized, three years before	41,768
Term loans amortized, four years before	21,133
Term loans amortized, prior	93,308
Term loans amortized, revolving	521
Outstanding balance	306,179		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	0
Current-period gross charge-offs, revolving	0
Charge-offs	0	0
Residential Portfolio Segment [Member] | Pass [Member]
Term loans amortized, current year	12,659
Term loans amortized, one year before	54,476
Term loans amortized, two years before	82,056
Term loans amortized, three years before	41,768
Term loans amortized, four years before	21,105
Term loans amortized, prior	91,881
Term loans amortized, revolving	521
Outstanding balance	304,466		294,254
Residential Portfolio Segment [Member] | Special Mention [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	0
Outstanding balance	0		0
Residential Portfolio Segment [Member] | Substandard [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	0
Term loans amortized, two years before	258
Term loans amortized, three years before	0
Term loans amortized, four years before	28
Term loans amortized, prior	1,427
Term loans amortized, revolving	0
Outstanding balance	1,713		2,054
Residential Portfolio Segment [Member] | Doubtful [Member]
Outstanding balance			0
Commercial And Industrial [Member]
Term loans amortized, current year	7,682
Term loans amortized, one year before	48,535
Term loans amortized, two years before	22,739
Term loans amortized, three years before	34,502
Term loans amortized, four years before	4,254
Term loans amortized, prior	10,869
Term loans amortized, revolving	66,443
Outstanding balance	195,024		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	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	(54)
Current-period gross charge-offs, revolving	0
Charge-offs	(54)	(30)
Commercial And Industrial [Member] | Pass [Member]
Term loans amortized, current year	7,682
Term loans amortized, one year before	48,127
Term loans amortized, two years before	22,392
Term loans amortized, three years before	33,958
Term loans amortized, four years before	3,950
Term loans amortized, prior	9,180
Term loans amortized, revolving	59,737
Outstanding balance	185,026		185,674
Commercial And Industrial [Member] | Special Mention [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	390
Term loans amortized, two years before	347
Term loans amortized, three years before	166
Term loans amortized, four years before	145
Term loans amortized, prior	567
Term loans amortized, revolving	6,178
Outstanding balance	7,793		7,936
Commercial And Industrial [Member] | Substandard [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	18
Term loans amortized, two years before	0
Term loans amortized, three years before	378
Term loans amortized, four years before	159
Term loans amortized, prior	1,122
Term loans amortized, revolving	528
Outstanding balance	2,205		1,992
Commercial And Industrial [Member] | Doubtful [Member]
Outstanding balance			0
Home Equity Lines of Credit [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	233
Term loans amortized, two years before	247
Term loans amortized, three years before	47
Term loans amortized, four years before	97
Term loans amortized, prior	3,291
Term loans amortized, revolving	122,640
Outstanding balance	126,555		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
Charge-offs	0	(25)
Home Equity Lines of Credit [Member] | Pass [Member]
Term loans amortized, current year	0
Term loans amortized, one year before	233
Term loans amortized, two years before	247
Term loans amortized, three years before	22
Term loans amortized, four years before	66
Term loans amortized, prior	2,813
Term loans amortized, revolving	122,027
Outstanding balance	125,408		127,080
Home Equity Lines of Credit [Member] | Special Mention [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	0
Outstanding balance	0		0
Home Equity Lines of Credit [Member] | Substandard [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	25
Term loans amortized, four years before	31
Term loans amortized, prior	478
Term loans amortized, revolving	613
Outstanding balance	1,147		985
Home Equity Lines of Credit [Member] | Doubtful [Member]
Outstanding balance			0
Construction and Other [Member]
Term loans amortized, current year	16,912
Term loans amortized, one year before	44,063
Term loans amortized, two years before	24,851
Term loans amortized, three years before	727
Term loans amortized, four years before	5,236
Term loans amortized, prior	1,247
Term loans amortized, revolving	10,353
Outstanding balance	103,389		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
Charge-offs	0	0
Construction and Other [Member] | Pass [Member]
Term loans amortized, current year	16,912
Term loans amortized, one year before	44,063
Term loans amortized, two years before	24,431
Term loans amortized, three years before	727
Term loans amortized, four years before	2,902
Term loans amortized, prior	1,247
Term loans amortized, revolving	9,253
Outstanding balance	99,535		90,728
Construction and Other [Member] | Special Mention [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	297
Term loans amortized, prior	0
Term loans amortized, revolving	0
Outstanding balance	297		308
Construction and Other [Member] | Substandard [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	2,037
Term loans amortized, prior	0
Term loans amortized, revolving	1,100
Outstanding balance	3,557		3,163
Construction and Other [Member] | Doubtful [Member]
Outstanding balance			0
Consumer Portfolio Segment [Member]
Term loans amortized, current year	734
Term loans amortized, one year before	1,606
Term loans amortized, two years before	689
Term loans amortized, three years before	192
Term loans amortized, four years before	105
Term loans amortized, prior	4,490
Term loans amortized, revolving	0
Outstanding balance	7,816		8,119
Current-period gross charge-offs current	0
Current-period gross charge-offs one year before	(22)
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	(7)
Current-period gross charge-offs, revolving	(29)
Charge-offs	(58)	$ (6)
Consumer Portfolio Segment [Member] | Pass [Member]
Term loans amortized, current year	734
Term loans amortized, one year before	1,606
Term loans amortized, two years before	689
Term loans amortized, three years before	191
Term loans amortized, four years before	105
Term loans amortized, prior	4,490
Term loans amortized, revolving	0
Outstanding balance	7,815		8,117
Consumer Portfolio Segment [Member] | Special Mention [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	0
Outstanding balance	0		0
Consumer Portfolio Segment [Member] | Substandard [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	1
Term loans amortized, four years before	0
Term loans amortized, prior	0
Term loans amortized, revolving	0
Outstanding balance	$ 1		2
Consumer Portfolio Segment [Member] | Doubtful [Member]
Outstanding balance			$ 0